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Sonel Mätutrustning MPI-536

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USER MANUAL
METER FOR ELECTRICAL
INSTALLATION PARAMETERS
MPI- 536
SONEL S.A.
Wokulskiego 11
58- 100 Świdnica
Poland
Version 1.06 12.07.2023
MPI- USER MANUAL 536 –
2
MPI- meter is a modern, easy in use and safe measuring device. Please acquaint your-self with this 536
manual in order to avoid measuring errors and prevent possible problems in operation of the meter.
MPI- USER MANUAL 536 –
3
CONTENTS
1 Safety ................................................................................................................ 6
2 Main menu ........................................................................................................ 7
2.1 Meter settings 8 ...........................................................................................................
2.1.1 Setting date and time ....................................................................................................... 9
2.1.2 Automatic shutdown ......................................................................................................10
2.1.3 Display parameters ........................................................................................................ 11
2.2 Settings of measuremen ts ..................................................................................... 12
2.2.1 Sub-menu Measurement Settings .................................................................................. 12
2.2.2 Sub-menu Edit fuses .....................................................................................................14
a. Adding fuse characteristics .......................................................................................... 14
b. Adding fuses ................................................................................................................ 19
2.3 Communication ...................................................................................................... 21
2.3.1 USB communication ...................................................................................................... 21
2.3.2 Connection to a Wi-Fi network ....................................................................................... 21
2.3.3 E-mail settings ............................................................................................................... 21
2.4 Update ................................................................................................................... 22
2.4.1 Update via USB ............................................................................................................. 22
2.4.2 Update via Wi- Fi ............................................................................................................ 22
2.5 Regional settings ................................................................................................... 23
2.6 Meter information ................................................................................................... 23
3 Measurements ................................................................................................ 24
3.1 Diagnostics performed by the meter limits –.......................................................... 25
3.2 Measurement of alternating voltage and frequency ............................................... 25
3.3 Checking the correctness of PE (protective earth) connections ............................ 26
3.4 Fault loop parameters ............................................................................................ 27
3.4.1 Settings of measurements ............................................................................................. 27
3.4.2 Fault loop parameters in the L-N and L-L circuits ........................................................... 29
3.4.3 Fault loop parameters in the L-PE circuit ....................................................................... 32
3.4 Fault loop impedance in L-PE circuit protected with a residual current device (RCD) .4 .... 35
3.4.5 Prospective short-circuit current ....................................................................................38
3.4.6 Measurement of fault loop impedance in IT networks .................................................... 39
3.5 Voltage drop ........................................................................................................... 40
3.6 Resistance- -earth to ................................................................................................ 42
3.6.1 Settings of measurements ............................................................................................. 42
3.6.2 Earth resistance measurement with 3-pole method (R E3P) ............................................ 43
3.6.3 Earth resistance measurement with 4-wire method (R E4P) ............................................ 47
3.6.4 Earth resistance measurement with 3-pole method with additional clamp (R E3P+C) ..... 51
3.6.5 Earth resistance measurement with two-clamp method (2C) ......................................... 55
3.7 Soil resistivity ......................................................................................................... 58
3.7.1 Settings of measurements ............................................................................................. 58
3.7.2 Main elements of the screen .......................................................................................... 59
3.7.3 Soil resistivity measurements ( ) ρ................................................................................... 60
3.8 RCD parameters .................................................................................................... 64
3.8.1 Settings of measurements ............................................................................................. 64
3.8.2 RCD tripping cur rent ...................................................................................................... 67
3.8.3 RCD tripping time .......................................................................................................... 70
3.8.4 Measurements in IT networks ........................................................................................ 73
3.9 Automatic measurements of RCD parameters ....................................................... 74
3.9.1 Setting automatic measurements of RCD parameters ...................................................74
3.9.2 Automatic measurement of RCDs .................................................................................. 75
MPI- USER MANUAL 536 –
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3.10 Insulation resistance .............................................................................................. 80
3.10.1 Settings of measurements ............................................................................................. 80
3.10.2 Measurement using probes ............................................................................................83
3.10.3 Measurements using UNI-Schuko adapter (WS-03 and WS- 04).................................... 85
3.10.4 Measurements using AutoISO- 2500 .............................................................................. 88
3.10.5 Graph of measured quantities as a function of time ....................................................... 91
3.11 -voltage resistance measurement Low ................................................................... 92
3.11.1 Resistance measurement .............................................................................................. 92
3.11.2 Measurement of resistance of protective conductors and equipotential bonding
with mA current ±200 ..................................................................................................... 94
3.12 Phase sequence .................................................................................................... 98
3.13 Motor rotation direction .......................................................................................... 99
3.14 Illuminance ........................................................................................................... 101
4 Auto measurements ....................................................................................103
4.1 Proceeding auto measurements .......................................................................... 103
4.2 Creating measurement procedures ...................................................................... 105
5 Memory of the meter .................................................................................... 107
5.1 Memory settings ................................................................................................... 107
5.2 Structure of the Memory ....................................................................................... 108
5.2.1 Fundamentals of navigating the Memory menu ............................................................ 109
5.2.2 Adding a new measurements tree ................................................................................111
5.3 Entering the measurement result ......................................................................... 116
5.4 Viewing saved measurements ............................................................................. 117
5.5 Sharing recorded measurements ......................................................................... 119
5.6 Searching the meter memory ............................................................................... 120
6 Power supply ................................................................................................ 121
6.1 Monitoring of the battery charge status ................................................................ 121
6.2 Replacing rechargeable batteries ........................................................................ 121
6.3 Charging the rechargeable batteries .................................................................... 122
6.4 General rules for using Li-Ion rechargeable batteries .......................................... 123
7 Cleaning and maintenance ......................................................................... 124
8 Storage .......................................................................................................... 124
9 Dismantling and utilisation ......................................................................... 124
10 Technical data .............................................................................................. 125
10.1 Basic data ............................................................................................................ 125
10.1.1 Measurement of alternating voltages (True RMS) ........................................................ 125
10.1.2 Frequency measurement ............................................................................................. 125
10.1.3 Measurement of fault loop impedance Z L-PE, ZL-N, ZL-L ................................................. 125
10.1.4 Measurement of fault loop impedance Z
L-PE[RCD] (without triggering of RCD) ...........................126
10.1.5 Measurement of parameters of RCD ...........................................................................127
10.1.6 Measurement of resistance- -earth R to E ....................................................................... 130
10.1.7 -voltage measurement of continuity of circuit and resistance Low ................................. 131
10.1.8 Measurement of insulation resistance .......................................................................... 132
10.1.9 Light measurements .................................................................................................... 133
10.1.10 Phase sequence .......................................................................................................... 134
10.1.11 Motor rotation ..............................................................................................................134
10.2 Other technical data ............................................................................................. 135
MPI- USER MANUAL 536 –
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10.3 Additional data ..................................................................................................... 136
10.3.1 Additional uncertainties according to IEC 61557-2 (R ISO) ............................................. 136
10.3.2 Additional uncertainties according to IEC 61557-3 (Z) ................................................. 136
10.3.3 Additional uncertainties according to IEC 615 - 57 4 (R ±200 mA).................................. 136
10.3.4 Additional uncertainties of earth resistance measurement (R E) .................................... 136
10.3.5 Additional uncertainties according to IEC 61557-6 (RCD) ............................................ 137
10.4 List of reference standards .................................................................................. 138
11 Accessories .................................................................................................. 138
12 Positions of the meter’s cover .................................................................... 139
13 Manufacturer ................................................................................................ 139
MPI- USER MANUAL 536 –
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1 Safety
MPI- meter is designed for performing check tests of protection against electric shock in AC 536
mains systems and recording the parameters of electric mains. The meter is used for making meas-
urements and providing results to determine safety of electrical installations. Therefore, in order to
provide conditions for correct operation and accuracy of obtained results, the following recommenda-
tions must be observed:
Before you proceed to operate the meter, acquaint yourself thoroughly with the present manual
and observe the safety regulations and specications provided by the producer .
Any application that diers from those specied in the present manual may result in a damage to
the device and constitute a source of danger for the user.
MPI- meters must be operated only by appropriately qualied personnel with relevant certi-536
cates authorising the personnel to perform works on electric systems. Operating the meter by un-
authorised personnel may result in damage to the device and constitute a source of danger for
the user.
Using this manual does not exclude the need to comply with occupational health and safety regu-
lations and with other relevant re regulations required during the performance of a particular type
of work. Before starting the work with the device in special environments, e.g. potentially fire-
risk/explosive environment, it is necessary to consult it with the person responsible for health and
safety.
It is unacceptable to operate:
a damaged meter which is completely or partially out of order,
a meter with damaged insulation,
a meter stored for an excessive period of time in disadvantageous conditions (e.g. excessive
humidity). If the meter has been transferred from a cool to a warm environment with a high
level of relative humidity, do not start measurements until the meter is warmed up to the am-
bient temperature (approximately 30 minutes).
If the battery is discharged to a level preventing further measurements, the meter displays an ap-
propriate message and then turns o.
Battery spill and damage to the meter may occur if discharged batteries are left in the meter.
Before measurements may commence, make sure the leads are connected to the appropriate
measurement sockets.
Do not operate a meter with an open or incorrectly closed battery (accumulator) compartment or
power it from other sources than those specied in the present manual.
RISO meter inputs are electronically protected against overloads (caused by e.g. connecting the
meter to a live circuit) up to 463 V RMS for 60 seconds.
Repairs may be performed only by an authorised service point.
NOTE!
Only accessories for a given device should be used. Using other accessories may
cause damage to measuring terminals, introduce additional measurement error and
create a risk for the user.
Due to continuous development of the meter’s software, the actual appearance of the
display, in case of some of the functions, may slightly dier from the display present-
ed in this operating manual.
MPI- USER MANUAL 536 –
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2 Main menu
The main screen is available:
after the meter has been turned on,
at any time after the on has been selected on the display (does not apply to the re-ic
corder).
Fig. 2.1 Main elements of the screen
Name of the active menu
The fact of introducing a change that has not been saved yet is indicated by the symbol in the *
screen header.
Time
Date
Main screen
Free space on the memory card
If the card is not in the slot, the icon on the screen is crossed out.
Wireless network signal strength
Battery discharge indicator
Active menu help
Visualisation of connection systems
Explanation of icons
Touching a selected main menu item redirects to the sub-menu. Available options:
Settings going to the settings of the main functions and parameters of the meter, –
Measurements Selecting the measurement function. The description of individual func-–
tions is provided in , section 3
MPI- USER MANUAL 536 –
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Memory viewing and managing the saved measurement results. A detailed description of –
the function is provided in , section 5
Meter information
2.1 Meter settings
The and display can be set from the screen level. date, time brightness Meter settings
MPI- USER MANUAL 536 –
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2.1.1 Setting date and time
Select . te and timeDa
Touch the appropriate icon to
modify the selected parameter:
value increase by 1,
value decrease by 1,
touching opens the eld for
manual entering of the value (step
).
Delete the existing entry and enter
the required value manually.
Functions of icons
reject the changes and return
to step
accept changes and go to step
MPI- USER MANUAL 536 –
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Description of function icons
return to the previous screen
After touching the icon you
may be prompted to save or
reject changes (gure):
Yes accept selection, –
No reject changes, –
Cancel cancel the action –
saving changes
return to the main menu
2.1.2 Automatic shutdown
Select Auto o .
Select the required option.
Description of function icons
return to the previous screen
After touching the icon you
may be prompted to save or
reject changes (gure):
Yes accept selection, –
No reject changes, –
Cancel cancel the action –
saving changes
return to the main menu
MPI- USER MANUAL 536 –
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2.1.3 Display parameters
Select . Display
Parameters to change
after which the display time
enters the screen-saver mode
– select the required option
display brightness move –
the slider pointer
Description of function icons
return to the previous screen.
After touching the icon you
may be prompted to save or
reject changes:
Yes accept selection, –
No reject changes, –
Cancel cancel the action –
saving changes
return to the main menu
MPI- USER MANUAL 536 –
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2.2 Settings of measurements
From the menu it is possible to edit: Measurement settings
network parameters,
fuse denitions.
2.2.1 Sub-menu Measurement Settings
The option of consists of: Measurement settings
mains rated voltage,
network frequency,
manner of presentation of short-circuit loop result,
type of mains for the tested object,
system of units,
memory settings (auto-incrementing memory cells),
auto measurements timer,
RCD EV measurement standard.
Before the measurements select the type of mains from which the tested object is powered.
Then select the mains rated voltage Un (110/190 V, 115/200 V, 127/220 V, 220/380 V, 230/400 V or
240/415 V). This voltage value is used for calculating the values of prospective short-circuit current.
Determination of network frequency that is the source of potential interferences is necessary in
order to select a proper measuring signal frequency in resistance- -earth measurements. This selec-to
tion ensures optimum interference ltering. The meter is designed for ltration of interferences gener-
ated by 50 Hz and 60 Hz networks.
RCD EV measurement standard denes the parameters for measuring RCD protectors dedicat-
ed to the eld of electromobility and photovoltaics.
Setting Autoincrementing as active ( ) causes each saved measurement ( sec-
tion 5.3) to be placed in an automatically created new measurement point ( step section 5.2.2 ).
Auto measurements timer determines the time interval of starting subsequent steps of the
measurement procedure.
MPI- USER MANUAL 536 –
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Expand the selection list using the icon.
Select the required parameter value.
Selection and modication options
Un voltage
110/190 V
115/200 V
127/220 V
220/380 V
230/400 V
240/415 V
Frequency f
n
50 Hz
60 Hz
Fault loop measurement form
Ik prospective sh -circuit current –ort
Zs fault loop impedance –
System type
TN/TT
IT
System of
units,
metric
imperial
Autoincrementing
enabled
disabled
Auto measurements
timer
Turn o
0…5 s
Description of function icons
return to the previous screen. After touching the
icon you may be prompted to save or reject
changes:
Yes accept selection, –
No reject changes, –
Cancel cancel the action –
saving changes
returning to the main menu
MPI- USER MANUAL 536 –
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2.2.2 Sub-menu Edit fuses
On the screen the following parameters of circuit breakers can be dened and edited: Fuse base
manufacturer,
model (type) of fuse,
characteristic of fuse.
a. Adding fuse characteristics
Select the icon.
A menu will appear for adding
time-current characteristics of
fuses.
MPI- USER MANUAL 536 –
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Available options
adding characteristics for the
selected fuse rated current.
removing characteristics for
the selected fuse rated cur-
rent.
pasting the set value for rec-
ords in the whole row or ta-
ble.
Description of function icons
inactive characteristic
active characteristic
adding a new characteristic
editing the name of the active
characteristic
removing the active character-
istic
returning to the previous
screen
going to the main menu
To create a new characteristic:
select the icon,
touch the name selection eld.
Enter the name from the touch
keypad (holding certain buttons for
a longer time triggers Polish char-
acters).
Functions of icons
rejecting changes and return-
ing to step
accepting changes and going
to step
MPI- USER MANUAL 536 –
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Description of function icons
Ok accept the name –
Cancel cancel the action –
Activate the created characteris-
tic .
Add rated fuse current using
icon .
Editing fuse data proceed as in
steps .
To activate a row of data, select
any item in the row.
Icons will be activat-
ed.
MPI- USER MANUAL 536 –
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After selecting , the following
options are available:
setting the parameter K –
multiplication factor of fuse
rated current (parameter of
the time-current characteris-
tic),
copying K value to ll row –
the selected row,
copying K value to ll table –
all records.
Touch the K parameter edit eld.
Enter the parameter values as in
step .
Description of function icons
Ok accept selection –
Cancel cancel changes –
You will be prompted to conform
the selection.
Description of function icons
Yes accept selection –
No reject changes –
To change the contents of a se-
lected cell, touch it . twice
MPI- USER MANUAL 536 –
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On-screen keyboard will appear.
Delete the existing entry and enter
the required one.
Functions of icons
reject changes and return to
the menu for adding charac-
teristics
accept changes and return to
the menu for adding charac-
teristics
Select the icon and return to
the fuse base menu.
MPI- USER MANUAL 536 –
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b. Adding fuses
▼
▼
MPI- USER MANUAL 536 –
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Select the producer.
MPI- USER MANUAL 536 –
21
2.3 Communication
2.3.1 USB communication
The B-type USB port built-in in the meter is used to connect the meter to the computer in order to
download the data stored in its memory. The data may be downloaded and read through the software
provided by the manufacturer.
Sonel Reader – the software is used to retrieve the data saved from the meter memory. In
addition, it enables data transfer to the PC, data saving in popular formats and printing.
Sonel Reports PLUS supports creation of documentation after testing of electrical instal-–
lation. Software communicates with Sonel test instruments, download data from memory of
test instrument and creates necessary documentation.
Detailed information is available from the manufacturer and distributors.
Connect the cable to the USB port of the computer and the USB slot of the meter.
Start the program.
Current versions of software may be found at the manufacturer website in section ’s
Download.
2.3.2 Connection to a Wi-Fi network
Go to . Settings Communication settings - ► ►Wi Fi
Turn on Wi-Fi (the Wi-Fi status icon should appear in the top bar).
Select a network with Internet access from the list. Touch it twice and - if it is password-
protected - enter the password. To log out of the network, also tap it twice.
Select and check that the meter is connected to the network. The Wi-Fi status icon will then Ok
indicate the signal strength.
2.3.3 E-mail settings
Go to Settings Communi-►
cation settings E-mail set-►
tings.
Fill the elds on the screen:
o parameters of the outbox,
o target mailbox address.
Press to send a test TEST
email.
The function works with selected email providers. The list of suppliers is available on the
manufacturer's website.
MPI- USER MANUAL 536 –
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2.4 Update
NOTE!
Before you proceed to software update, charge the accumulators.
Do not switch o the meter while updating.
2.4.1 Update via USB
The update le can be downloaded from the manufacturer's website.
Save the le to a USB drive. The memory must have the FAT32 le system.
Select to open the update menu. Settings ►Update
Insert the USB memory in the
Type A USB port in the meter.
The information screen will ap-
pear.
To start the update process, se-
lect in the information win-Ok
dow.
Alternatively, you can press the button. Then follow the procedure de-Update via Wi-Fi
scribed in . sec. 2.4.2
2.4.2 Update via Wi- Fi
Connect to the Wi-Fi network according to . sec. 2.3.2
Choose one of the following.
Go to and select . Settings Software update ►Update via Wi-Fi
Restart the meter.
The device will automatically check if a software update is available. If it is, a window is dis-
played asking the user to accept the update.
To start the update process, select in the information window. Ok
Security features inside some networks may prevent the meter from being able to con-
nect to the manufacturer's server with updates then the following message will be dis-–
played: Unable to update Wi-Fi...
MPI- USER MANUAL 536 –
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2.5 Regional settings
Select to Settings ►Regional
open the language settings
menu.
Expand the list of languages to
select from.
Select the required language.
Description of function icons
return to the previous screen
(you may be prompted to save
or reject changes)
saving changes
returning to the main menu
If the changes have not been
saved or the icon was select-
ed, a prompt will appear to conrm
the selection.
Description of function icons
Yes accept selection –
No reject selection–
Cancel cancel the action –
2.6 Meter information
Select in the main Meter info
menu.
The menu contains information on
the manufacturer and the meter.
Description of function icons
return to the previous screen
(you may be prompted to save
or reject changes)
display detailed information
return to the main menu
MPI- USER MANUAL 536 –
24
3 Measurements
The following tests are available from the menu: Measurements
fault loop impedance(ZL-N, ZL-PE , ZL-PE[RCD] with RCD),
voltage drop , ΔU
insulation resistance R ISO,
RCD eciency (operating current RCD I A, operate time t RCD A automatic measure-and
ments ),
resistance R X,
continuity of connections R CONT,
phase sequence , 1-2-3
direction of motor rotation , U-V-W
resistance- -earthto R E,
soil resistivity , Ωm
illuminance . Lux
WARNING
During measurements (fault loop, RCD), do not touch conductive accessible or
foreign parts of the tested electrical installation.
The content of this chapter should be thoroughly familiarized with. It describes the
meter circuits methods of measurements, the and basic principles concerning
interpretation of measurement results.
A progress bar is displayed during long measurements.
The result of the last measurement is displayed until:
o next measurement starts,
o measurement parameters are changed,
o measurement function is changed,
o the meter is switched o.
The last measurement can be recalled using the icon.
MPI- USER MANUAL 536 –
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3.1 Diagnostics performed by the meter limits –
The meter is able to assess whether the measurement result is within acceptable limits for the se-
lected safety device or the limit value The user may set a limit, the threshold value which should not
be exceeded by the result. It is possible for all measurement functions except for :
RCD measurements (I A, tA) for which the limits are permanently enabled,
fault loop measurements, where the limit is determined indirectly by selecting a suitable
overcurrent protection for which standard limits are assigned,
the recorder.
For the measurements of insulation resistance and light the limit is the value. For meas-minimum
urements of fault loop impedance, earth resistance, resistance of protective conductors and equipo-
tential bonding - it is the value. maximum
The limits are set in the relevant measurement menu. After each measurement the meter dis-
plays the symbols:
the result is within the set limits,
the result is outside the set limits,
assessment of the result correctness not possible. The symbol is displayed, when for exam-
ple the result is not available (e.g. measurement in progress, or no measurement has been
performed)
the method for setting limits is described in the sections describing the measurement data.
3.2 Measurement of alternating voltage and frequency
The meter measures and displays alternating voltage and network frequency in the selected
measurement functions in accordance with the table below.
Measuring function
U
f
ZL-N
ZL- PE
ZL-PE[RCD]
RISO
RCD IA
RCD t A
Rx
RCONT
Phase sequence
Motor rotation
Resistance- -earth Rto E
Soil resistivity
Illuminance
MPI- USER MANUAL 536 –
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3.3 Checking the correctness of PE (protective earth) connections
When the meter is connected as in the drawing, touch the contact electrode and wait for
about . If voltage is detected on the PE conductor, the device: 1 second
will display text (installation error, the PE lead connected to the phase conductor) and
will generate a continuous audio signal
This option is available for all measuring functions that apply to residual current devices (RCD) and
fault loop except Z L-N -L, L measurement.
WARNING
When phase voltage is detected on PE lead, measurements must be immediate-
ly stopped and a fault in the installation must be removed.
Make sure to stand on non-insulated ground when measuring. Insulated ground
may cause an incorrect test result.
If the voltage on the PE conductor exceeds the acceptable limit value (approx 50 V),
the meter will signal the fact.
If the IT network has been selected in step , the contact electrode section 2.2.1
is . inactive
MPI- USER MANUAL 536 –
27
3.4 Fault loop parameters
NOTE!
If there are residual current devices in the network tested, they should be bypassed
by bridging for the period of impedance measurement. However, it should be re-
membered that the tested circuit is modied in this way and the obtained results
may slightly dier from the actual results.
After completing measurements, always remove modications introduced to the
tested system for the period of measurements and check the operation of the resid-
ual current switch.
The above remarks do not apply measurements of fault loop impedance with the to
use of function ZL- [RCD]PE .
Measurements of short-circuit loop impedance downstream the inverters inef- are
fective and measurement results . This is due to the uctuations of inter-unreliable
nal impedance of the inverter during its operations. Do not perform measurements
of short-circuit loop impedance directly downstream inverters.
3.4.1 Settings of measurements
Select item ZL-N, L-L, ZL-PE
or ZL-PE[RCD] .
The correctness of the measure-
ment depends on the correct ad-
justment of the length of leads.
If a WS type adapter has not
been connected to the meter,
standard manufacturer's lead
lengths are available in the menu.
In this case, touch the drop-
down list field.
Select the required lead length.
The prospective short-circuit cur-
rent Ik can be calculated based on
one of two values:
rated network voltage Un ,
voltage measured by the me-
ter U0.
The physical meaning of the pa-
rameter is presented in section
3.4.5.
Touch the drop-down list eld.
Select the required value.
MPI- USER MANUAL 536 –
28
The result can be compared
against the acceptable fault loop
impedance Z
sdop , determined on
the basis of the fuse parameters
of the tested circuit:
characteristic,
rated current.
Touch the fuse type eld.
Options to select:
Manufacturer
GENERAL no dened –
manufacturer
manufacturers dened in the
meter memory (section
2.2.2)
Type
GENERAL no dened type –
types dened in the meter
memory ( ) section 2.2.2
Time-current characteristic
Rated current I N
Acceptable response time
Limit the limit resulting from –
standard EN 60364-6
I--– – a as in the standard ta-
bles no correction –
I 2/3Z – a is increased by the
value of 0.5Ia
The current is calculated after set-
ting parameters in steps .
Ia current ensuring automatic –
triggering of a protective device
within a required time.
Description of function icons
Ok accept fuse settings–
Cancel cancel the action –
MPI- USER MANUAL 536 –
29
3.4.2 Fault loop parameters in the L-N and L-L circuits
Connect test leads according to the drawing
for measurement in the L-N circuit, or
for measurement in the L-L circuit.
Select item ZL-N -L, L .
The measurement screen will ap-
pear.
Live mode
UL-N current voltage between –
phase and neutral conductors
f – current frequency on the tested
object
Enter the measurement settings in accordance with .section 3.4.1
MPI- USER MANUAL 536 –
30
Press START to perform meas-
urement.
Read out the result.
ZL-N the main result –
Ik prospective short-circuit cur-–
rent with signalling the fullment of
the acceptable loop criterion (sec-
tion 3.4.1, step ):
met
not met
assessment not possible
IA current ensuring automatic –
triggering of a selected protective
device within a required time
After selecting the bar on the
right side, a menu will show with
additional measurement results.
R – resistance of the tested circuit
XL reactance of the tested circuit –
UL-N voltage relative to the neutral –
conductor
f – frequency
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . section 5.3
The last measurement can be recalled using the icon.
When many measurements are performed in short time intervals, the meter may emit a
large amount of heat. As a result of this, the housing of the device may become hot.
This is . In addition, the meter is equipped with the protection against excessive normal
temperature.
After approx. 15 consecutive measurements of the fault loop wait until the instrument
cools down. This limitation is due to the high current measurement and multifunctionali-
ty of the meter.
Minimum between successive measurements is . The displayed interval 5 seconds
message indicates that it is possible to perform another measurement. Until
the message is displayed, the meter prevents any measurements.
MPI- USER MANUAL 536 –
31
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
UL-N voltage is incorrect for making a measurement.
UL-PE voltage is incorrect for making a measurement.
UN-PE voltage exceeds allowable value of 50 V.
Phase connected to N terminal instead of L terminal (for
example, exchange of L and N in the mains socket).
Maximum temperature inside the meter is exceeded.
Network frequency is outside the range of 45...65 Hz.
Error during the measurement. Correct result cannot be
displayed.
Loop circuit mal-
function!
The meter should be serviced.
and continuous au-
dio signal
Before measurement, voltage at test terminals exceeds
500 V.
The voltage on the tested object is not within the limits
specified for the set rated voltage of the network U n (sec-
tion 2.2.1 step ).
Too low value of the prospective short circuit current I k for
the pre-set fuse and time of its triggering.
MPI- USER MANUAL 536 –
32
3.4.3 Fault loop parameters in the L-PE circuit
Connect test leads according to . Fig. 3.1 or Fig. 3.2
Fig. 3.1 Measurement in L-PE circuit
Fig. 3.2 Checking effectiveness of protection against electric shock of the meter housing
in case of: TN network or TT network
MPI- USER MANUAL 536 –
33
Enter the measurement settings in accordance with .section 3.4.1
MPI- USER MANUAL 536 –
34
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . section 5.3
The last measurement can be recalled using the icon.
Double-lead measurement is not available for the UNI-Schuko adapter.
When many measurements are performed in short time intervals, the meter may
emit a large amount of heat. As a result of this, the housing of the device may be-
come hot. This is . In addition, the meter is equipped with the protection normal
against excessive temperature.
After approx. 15 consecutive measurements of the fault loop wait until the instru-
ment cools down. This limitation is due to the high current measurement and multi-
functionality of the meter.
Minimum between successive measurements is . The displayed interval 5 seconds
message indicates that it is possible to perform another measurement.
Until the message is displayed, the meter prevents any measurements.
MPI- USER MANUAL 536 –
36
Fig. 3.5 Measurement in the TN-C-S system
Select item Z L-PE[RCD] .
The measurement screen will ap-
pear.
Live mode
UL-PE current voltage between –
phase and protective conductors
f – current frequency on the tested
object
Enter the measurement settings in accordance with .section 3.4.1
Press the START button to per-
form measurement.
MPI- USER MANUAL 536 –
37
Read out the result.
ZL-PE the main result –
Ik prospective short-circuit cur-–
rent with signalling the fulfilment of
the acceptable loop criterion (sec-
tion 3.4.1, step ):
met
not met
assessment not possible
Ia current ensuring automatic –
triggering of a selected protective
device within a required time
After selecting the bar on the
right side, a menu will slide out with
additional measurement results.
R – resistance of the tested circuit
XL reactance of the tested circuit –
UL-PE voltage relative to the pro-–
tective conductor
f – frequency
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . section 5.3
The last measurement can be recalled using the icon.
Maximum measurement time is few seconds. The measurement can be interrupted
by pressing the button.
In the electrical installations with 30 mA RCD's, the sum of leakage currents of the
installation and the test current may trigger the RCD. If this happens, try to reduce
the leakage current in the tested mains (for example by disconnecting loads).
The function works for residual current devices of rated current ≥ mA. 30
When many measurements are performed in short time intervals, the meter may
emit a large amount of heat. As a result of this, the housing of the device may be-
come hot. This is . In addition, the meter is equipped with the protection normal
against excessive temperature.
After approx. 15 consecutive measurements of the fault loop wait until the instru-
ment cools down. This limitation is due to the high current measurement and multi-
functionality of the meter.
Minimum between successive measurements is . The displayed interval 5 seconds
message indicates that it is possible to perform another measurement.
Until the message is displayed, the meter prevents any measurements.
MPI- USER MANUAL 536 –
38
3.4.5 Prospective short-circuit current
The meter always measures fault loop impedance Z S and the displayed short-circuit current is
calculated according to the following formula:
S
kZ
U
I
where:
ZS measured impedance, –
U – voltage dependent on the network rated voltage settings U n ( point section 3.4.1 ):
Ik
(Un)
U = Un
Ik
(U0)
U = U0 for U 0 < Un
U = Un for U 0 ≥ U n
where:
Un nominal voltage of the network, –
U0 voltage measured by the meter. –
On the basis of U n rated voltage selected ( ), the meter automatically recognizes section 2.2.1
the measurement at phase voltage or phase- -phase voltage and takes it into account in the calcula-to
tions.
If the voltage of the network being tested is outside the tolerance range, the meter will not be
able to determine a proper rated voltage for the short-circuit current calculation. In such a case, – – -
will be displayed instead of short-circuit current value. shows voltage ranges for which short-Fig. 3.6
circuit current value is calculated.
230 400 440 U [V]
207 253 360
115 127 180 200 220
220 380 418
198 242 342
373 415 440216 240 264
103 440 U [V]
440 U [V]
U [V]
U =115 V
n
U =220 V
n
U =230 V
n
U =240 V
n
110 121 171 190 20999 440 U [V]
U =110 V
n
127 140 198 220 242
114 440 U [V]
U =127 V
n
99
99
99
99
99
Fig. 3.6 Measuring voltage ranges
The voltage range for which the impedance measurement
is performed
The voltage range U L-L'
for which the short-
circuit current is calculated
The voltage range U L-N' for which the
short-circuit current is calculated
MPI- USER MANUAL 536 –
39
3.4.6 Measurement of fault loop impedance in IT networks
Before performing the measurements in the menu select the appropriate Measurement settings
network type (section 2.2.1).
NOTE!
After selecting an IT type network, the function of the contact electrode is . inactive
When attempting to perform the ZL-PE and ZL-PE[RCD] measurement a message will
appear informing that the measurement is impossible.
The manner of connecting the device to the installation is shown in . Fig. 3.7
The manner of performing the fault loop measurements is described in section 3.4.2.
Operating voltage range: . 95 V … 440 V
Fig. 3.7 Measurement in the IT system
MPI- USER MANUAL 536 –
40
3.5 Voltage drop
This function determines the voltage drop between two points of the tested network, selected by the
user. The test is based on measurement of fault loop impedance L-N at these points. In a standard
network, usually the voltage drop is tested between the socket and the switchgear (reference point).
The voltage drop is calculated according to the following formula:
 
%100
N
NREF
U
IZZ
U
where:
Z – fault loop impedance at the destination point,
ZREF fault loop impedance at the reference point, –
IN rated fuse current –
UN rated mains voltage. –
▼
Select item . ΔU
Use setting to reset Zref= ---
previous measurement, if it has
not been done yet.
Enter the of voltage drop limit
ΔU MAX.
Enter , which pro-the fuse type
tects the tested circuit.
Connect the meter to the reference point of the tested network, as for Z
L-N measurement
Press START.
MPI- USER MANUAL 536 –
41
Change the setting from to . Zref Z
Connect the meter to the reference point, as for ZL-N measurement.
Press START.
Read out the result.
ΔU the main result and indic–a-
tion of meeting criterion ΔU
MAX:
green:
ΔU ≤ ΔUMAX
red:
ΔU > ΔUMAX
Ik prospective short-circuit cu–r-
rent
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
R – resistance of the tested circuit
XL – reactance of the tested circuit
UL-N – voltage relative to the neutral
conductor
f – frequency
IA
– protection tripping current
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled using section 5.3
the icon.
If Z REF is greater than Z, then the meter indicates ΔU = 0%
MPI- USER MANUAL 536 –
42
3.6 Resistance- -earth to
3.6.1 Settings of measurements
Select item RE.
Touch the parameter drop-down
menu (measuring voltage se-Un
lection).
Select the required measuring
voltage from the list.
Touch the drop-down menu of
measurement method selection.
Available measurement methods
3-pole
4-wire
3-pole + receiving clamp
2-clamp (transmitting + re-
ceiving clamp)
Select to set the resistance Limit
limit.
Select unit.
Enter the required resistance
limit value:
0.00…1990 for Ω,
0.00…2 for kΩ.
Functions of icons
reject changes and exit to the
previous screen
accept changes
MPI- USER MANUAL 536 –
43
3.6.2 Earth resistance measurement with 3-pole method (R
E
3P)
The three-pole measuring method is the basic type of resistance- -earth measurement. to
Disconnect the tested earth electrode from the installation of the facility.
Drive the electrode into the earth and connect to the socket of the meter. current H
Drive the electrode into the earth and connect to the socket of the meter. voltage S
The being tested should be connected to socket of the meter. earth electrode E
It is recommended that the tested as well as electrodes should be earth electrode H and S
located along one line and at relevant distances, in accordance with the rules of earth
measurements.
MPI- USER MANUAL 536 –
44
Select the option in the 3P
measurement menu.
Select other settings in accord-
ance with . section 3.6.1
The meter is ready for measure-
ment.
Live mode
U interference voltage currently –
on the object
Limits
RE MAX currently set earth r–e-
sistance limit
Press START to start the meas-
urement.
Read out the result .
Signal lights for reaching the limit
( section 3.6.1 step )
the result is within the set limit
the result is outside the set lim-
it
assessment not possible
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
MPI- USER MANUAL 536 –
45
RH resistance of current elec-–
trod e
RS –resistance of voltage elec-
trode
δ additional uncertainty caused –
by resistance of the electrodes
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled us-section 5.3
ing the icon.
Repeat the steps for two
additional locations of the voltage
electrode : S
located at a certain distance
from the tested earth electrode,
moved closer by the same dis-
tance to the tested electrode.
This is done to conrm that the S
electrode was driven into the ref-
erence earth. If so, the dierence
between the value of RE between
the main measurement and each
additional measurement should
not exceed 3%.
If RE measurement results dier
from one another by more than
3%, the distance of the current
electrode from the earth electrode
being tested should be consid-
erably increased and the meas-
urements should be repeated.
WARNING
Measurement of resistance- -earth may be carried out if voltage of interfeto r-
ences does not exceed 24 V. Voltage of interferences is measured up to the
level of 100 V.
Over 50 V it is signalled as hazardous. The meter must not be connected to
voltages exceeding 100 V.
MPI- USER MANUAL 536 –
46
It is recommended that the test as well as electrodes earth electrode H and S
should be located in one line. Due to the dierent field conditions it is not always
possible. On the manufacturer website and in professional literature special cases ’s
of probes location have been discussed.
Particular attention should be paid to quality of connection between the object being
tested and the test lead the contact area must be free from paint, rust, etc. –
If resistance of test probes too high is , RE earth electrode measurement will in-
clude an additional uncertainty. Particularly high uncertainty of measurement oc-
curs when the tested resistance is small, and the probes have a weak contact with
earth (such a situation occurs frequently when the earth electrode is well made but
the upper soil layer is dry and slightly conductive). Then, the ratio of resistance of
the probes to resistance of the tested earth electrode is very high and consequently,
uncertainty of measurement that depends on this ratio is also very high. δ
To reduce the uncertainty of the measurement, the contact of the probe with δ,
earth may be improved, for example, by:
o moistening the spot where the probe is driven with water,
o driving the probe in a dierent location,
o applying an 80 cm probe.
Also, test the test leads for:
o whether their insulation is not defective
o whether the lead banana plug probe contact areas are not corroded or loos-– –
ened.
In majority of cases the achieved measurement accuracy is satisfactory. However,
you should always take account of the uncertainty included in the measurement.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage at the meter terminals.
Interruption in the test probe circuit.
Interruption in the voltage probe circuit.
RE>1.99 kΩ
Measuring range is exceeded.
Signal / noise ratio is too low (interfering signal too large).
Error due to the resistance of electrodes > 30 % (for cal-
culating uncertainty, measured values are taken into ac-
count ).
Interruption in measuring circuit or resistance of test
probes is higher than 60 kΩ.
MPI- USER MANUAL 536 –
47
3.6.3 Earth resistance measurement with 4-wire method (R
E
4P)
Four-pole method is recommended for use in the measurement of earth resistance of very small
values. It allows user to eliminate the inuence of resistance of test leads on the measurement re-
sults. It is also suitable for determining the resistivity of the soil. However, it is recommended that the
dedicated function should be used for this measurement ( section 3.7).
Disconnect the tested earth electrode from the installation of the facility.
Drive the electrode into the earth and connect to the socket of the meter. current H
Drive the electrode into the earth and connect to the socket of the meter. voltage S
The earth electrode being tested should be connected to E socket of the meter with the lead.
ES socket should be connected to the tested earth electrode below lead. E
It is recommended that the tested as well as electrodes should be earth electrode H and S
located along one line and at relevant distances, in accordance with the rules of earth
measurements.
MPI- USER MANUAL 536 –
48
MPI- USER MANUAL 536 –
49
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled using section 5.3
the icon.
WARNING
Measurement of resistance- -earth may be carried out if voltage of interfeto r-
ences does not exceed 24 V. Voltage of interferences is measured up to the
level of 100 V.
Over 50 V it is signalled as hazardous. The meter must not be connected to
voltages exceeding 100 V.
MPI- USER MANUAL 536 –
50
It is recommended that the tes as well as electrodes t earth electrode H and S
should be located in one line. Due to the dierent field conditions it is not always
possible. On the manufacturer website and in professional literature special cases ’s
of probes location have been discussed.
- Particular attention should be paid to quality of connection between the object be-
ing tested and the test lead the contact area must be free from paint, rust, etc. –
If resistance of test probes too high is , RE th electrode measurement will ear in-
clude an additional uncertainty. Particularly high uncertainty of measurement oc-
curs when the tested resistance is small, and the probes have a weak contact with
earth (such a situation occurs frequently when the earth electrode is well made but
the upper soil layer is dry and slightly conductive). Then, the ratio of resistance of
the probes to resistance of the tested earth electrode is very high and consequently,
uncertainty of measurement that depends on this ratio is also very high. Then, in δ
accordance with the formulas from , calculations can be made to es- section 10.3.4
timate the inuence of measurement conditions.
To reduce the uncertainty of the measurement, the contact of the probe with δ,
earth may be improved, for example, by:
o moistening the spot where the probe is driven with water,
o driving the probe in a dierent location,
o applying an 80 cm probe.
Also, test the test leads for:
o whether their insulation is not defective
o whether the lead banana plug probe contact areas are not corroded or loos-– –
ened.
In majority of cases the achieved measurement accuracy is satisfactory. However,
you should always take account of the uncertainty included in the measurement.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage at the meter terminals.
Interruption in the test probe circuit.
Interruption in the voltage probe circuit.
RE>1.99 kΩ
Measuring range is exceeded.
Signal / noise ratio is too low (interfering signal too large).
Error due to the resistance of electrodes > 30 % (for cal-
culating uncertainty, measured values are taken into ac-
count).
Interruption in measuring circuit or istance of test res
probes is higher than 60 kΩ.
MPI- USER MANUAL 536 –
51
3.6.4 Earth resistance measurement with 3-pole method with additional
clamp (RE3P+C)
Drive the electrode into the earth and connect to the socket of the meter. current H
Drive the electrode into the earth and connect to the socket of the meter. voltage S
The earth electrode being tested should be connected to socket of the meter with the E
lead.
It is recommended that the tested as well as electrodes should be earth electrode H and S
located along one line and at relevant distances, in accordance with the rules of earth
measurements.
Receiving clamps should be attached to the tested earth electrode below the connection
point of lead. E
The arrow on the clamps in any direction can be directed .
Select the option in 3P + clamps
the measurement menu.
Select other settings in accord-
ance with . section 3.6.1
MPI- USER MANUAL 536 –
52
The meter is ready for measure-
ment.
Live mode
U interference voltage currently –
on the object
I interference current currently –
owing through the object
Limits
RE MAX currently set earth r–e-
sistance limit
Press START to start the meas-
urement.
Read out the result .
Signal lights for the limit (section
3.6.1 step )
the result is within the set limit
the result is outside the set
li itm
assessment not possible
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
RH resistance of current elec-–
trode
RS –resistance of voltage elec-
trode
δ additional uncertainty caused –
by resistance of the electrodes
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled using section 5.3
the icon.
MPI- USER MANUAL 536 –
53
Repeat the steps for two
additional locations of the voltage
electrode S:
located at a certain distance
from the tested earth electrode,
moved closer by the same dis-
tance to the tested earth elec-
trode.
This is done to conrm that the S
electrode was driven into the ref-
erence earth. If so, the dier-
ence between the value of RE
between the main measurement
and each additional measurement
should not exceed 3%.
If RE measurement results dier
from one another by more than
3%, the distance of the current
electrode from the earth electrode
being tested should be consid-
erably increased and the meas-
urements should be repeated.
WARNING
Measurement of resistance- - rth may be carried out if voltage of interfeto ea r-
ences does not exceed 24 V. Voltage of interferences is measured up to the
level of 100 V.
Over 50 V it is signalled as hazardous. The meter must not be connected to
voltages exceeding 100 V.
It is recommended that the test as well as electrodes earth electrode H and S
should be located in one line. Due to the dierent eld conditions it is not always
possible. On the website manufacturer website and in professional literature spe-’s
cial cases of probes location have been discussed.
Use for the measurement. C-3 clamps
Maximum interference current: 1 A.
Particular attention should be paid to quality of connection between the object being
tested and the test lead the contact area must be free from paint, rust, etc. –
If resistance of test probes too high is , RE earth electrode measurement will in-
clude an additional uncertainty. Particularly high uncertainty of measurement oc-
curs when a small value of resistance- -earth is measured with probes that have a to
weak contact with earth (such a situation occurs frequently when the earth electrode
is well made and the upper soil layer is dry and slightly conductive). Then, the ratio
of resistance of the probes to resistance of the tested earth electrode is very high
and consequently, uncertainty of measurement that depends on this ratio is also
very high. Then, in accordance with the formulas from , calculations section 10.3.4
can be made to estimate the inuence of measurement conditions. To reduce the
uncertainty of the measurement, the contact of the probe with earth may be im-δ,
proved, for example, by:
MPI- USER MANUAL 536 –
54
o moistening the spot where the probe is driven with water,
o driving the probe in a dierent location,
o applying an 80 cm probe.
Also, test the test leads for:
o whether their insulation is not defective
o whether the lead banana plug probe contact areas are not corroded or loos-– –
ened.
In majority of cases the achieved measurement accuracy is satisfactory. However,
you should always take account of the uncertainty included in the measurement.
Factory calibration does not include the resistance of the test leads. The result dis-
played by the meter is a sum of the resistance of the measured object and the re-
sistance of leads.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage at the meter terminals.
RE>1.99 kΩ
Measuring range is exceeded.
Signal / noise ratio is too low (interfering signal too large).
Error due to the resistance of electrodes > 30 % (for cal-
culating uncertainty, measured values are taken into ac-
count ).
Interruption in measuring circuit or resistance of test
probes is higher than 60 kΩ.
Interruption in the test probe circuit.
Interruption in the voltage probe circuit.
Too small test current.
No continuity in the current clamps circuit.
MPI- USER MANUAL 536 –
55
3.6.5 Earth resistance measurement with two-clamp method (2C)
The double-clamp measurement may be applied where there is no possibility to use
electrodes driven into the ground.
The double-clamp method may only be used when measuring (it multiple earthing
is necessary to provide a return path for the test current).
For ring earth electrodes (step variant ) the method allows switching oto
determine continuity of the measured earth electrode point with the rest of the
earth electrode.
Transmitting clamps and measuring clamps should be attached to the tested earth elec-
trode at a distance of at least 30 cm from each other.
The arrow on the clamps in any direction can be directed .
Connect the transmitting to socket. clamps N-1 H and E
Connect the to the clamp socket. measuring clamps C-3
MPI- USER MANUAL 536 –
56
Select the clamps + clamps
option in the measurement
menu.
Select other settings in ac-
cordance with sec-
tion 3.6.1.
The meter is ready for meas-
urement.
Live mode
I interference current cur-–
rently owing through the ob-
ject
Limits
RE MAX currently set earth r–e-
sistance limit
Press START to start the
measurement.
Read out the result.
Signal lights for the limit (sec-
tion 3.6.1 step )
the result is within the
set limit
the result is outside the
set limit
assessment not possible
Save the measurement to the meter memory using the icon. A detailed description
of memory management is contained in . The last measurement can be re-section 5.3
called using the icon.
MPI- USER MANUAL 536 –
57
Measurements may be performed in the presence of interference current of a value
not exceeding 3 A RMS and frequency in accordance with the value set in sub-
menu ( step Measurement settings section 2.2.1 ).
Use as signal transmitting clamps and as receiving N-1 clamps C-3 clamps
clamps.
If the current on measuring clamps is too low, the meter displays the following mes-
sage: The current measured by clamps is too low. Measurement is not possi-
ble!
Maximum interference current: 1 A.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
RE>99.9Ω
Measuring range is exceeded.
Signal / noise ratio is too low (interfering signal too large).
Error due to the resistance of electrodes > 30 % (for cal-
culating uncertainty, measured values are taken into ac-
count ).
Too small test current.
No continuity in the current clamps circuit.
MPI- USER MANUAL 536 –
58
3.7 Soil resistivity
For soil resistivity measurements used as preparation for the designing the earthing system or –
in geology measurements a separate function is provided: measurement of soil resistivity This –
function is identical to 4-wire measurement of earth resistance, however, it contains an additional pro-
cedure of entering the distance between the electrodes. The measurement result is the resistivity val-
ue, calculated automatically according to the formula applied in Wenner method:
ρ = 2
LRE
where:
L – distance between the electrodes (all distances must be equal),
RE measured resistance. –
3.7.1 Settings of measurements
MPI- USER MANUAL 536 –
59
Select unit.
3.7.2 Main elements of the screen
Select item Soil resistivity mΩ.
The measurement screen will
ap pear.
Live mode
U interference voltage –
Limits
ρMAX soil resistivity limit –
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
RH resistance of current ele–c-
trode
RS resistance of voltage ele–c-
trode
δ additional uncertainty –
caused by resistance of the
electrodes
Selecting the bar hides the
menu.
MPI- USER MANUAL 536 –
60
3.7.3 Soil resistivity measurements ( ) ρ
Drive 4 probes into the ground and at distances. in one line equal
Connect the probes to the meter according to the gure above.
Call up the measurement
menu.
Select other settings in accord-
ance with . section 3.7.1
MPI- USER MANUAL 536 –
61
Select distance between the L
measuring electrodes:
using arrows ,
from the keyboard after
touching the eld with the dis-
tance value (range 1…30 m)
Functions of icons
reject changes and exit to the
previous screen
accept changes
The meter is ready for measure-
ment.
Press START to start the meas-
urement.
Read out the result .
Signal lights for reaching the limit
( step section 3.7.1 ):
the result is within the set
limit
the result is outside the set
limit
assessment not possible
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
MPI- USER MANUAL 536 –
62
RH resistance of current ele–c-
trode
RS –resistance of voltage elec-
trode
δ additional uncertainty caused –
by resistance of the electrodes
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled us-section 5.3
ing the icon.
WARNING
Measurement of resistivity may be carried out if voltage of interferences does
not exceed 24 V. Voltage of interferences is measured up to the level of 100 V.
Over 50 V it is signalled as hazardous. The meter must not be connected to
voltages exceeding 100 V.
MPI- USER MANUAL 536 –
63
The calculations assume that the distance between the measuring electrodes are
equal (Wenner method). If it is not the case, perform the measurement of earth re-
sistance using 4-pole method and calculate resistivity from the formula:
ρ 2πLR = E
where:
L – distance between the electrodes
RE measured resistance –
Particular attention should be paid to quality of connection between the object being
tested and the test lead the contact area must be free from paint, rust, etc. –
If resistance of test probes too high will include an is , resistivity measurement
additional uncertainty. A particularly large measurement uncertainty arises when a
small resistance value is measured with probes that have weak contact with the
ground. Then, the ratio of resistance of the probes to measured resistance as a re-
sistivity formula component is very high and consequently, uncertainty of measure-
ment that depends on this ratio is also very high. Then, in accordance with the for-
mulas from , calculations can be made to estimate the inuence of section 10.3.4
measurement conditions.
To reduce the uncertainty of the measurement, the contact of the probe with δ,
earth may be improved, for example, by:
o moistening the spot where the probe is driven with water,
o driving the probe in a dierent location,
o applying an 80 cm probe.
Also, test the test leads for:
o whether their insulation is not defective
o whether the lead banana plug probe contact areas are not corroded or loos-– –
ened.
In majority of cases the achieved measurement accuracy is satisfactory. However,
you should always take account of the uncertainty included in the measurement.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage at the meter terminals.
Interruption in the test probe circuit.
Interruption in the voltage probe circuit.
RE>1.99 kΩ
Measuring range is exceeded.
Signal / noise ratio is too low (interfering signal too large).
Error due to the resistance of electrodes > 30 % (for cal-
culating uncertainty, measured values are taken into ac-
count).
Interruption in measuring circuit or resistance of test
probes is higher than 60 kΩ.
MPI- USER MANUAL 536 –
64
3.8 RCD parameters
The measurement of UB, RE is always performed with sinusoidal current 0.4 In re-
gardless of the settings concerning waveform and multiplication factor I
n.
3.8.1 Settings of measurements
Select item RCD IA or RCD t A
.
Dene the displayed measure-
ment components with the
icon:
if RCD IA has been selected,
if RCD tA has been select-
ed.
For RCD IA the following pa-
rameters are available:
IA
RCD tripping current, –
UB voltage measured on PE, –
RE PE continuity, –
tAi
RCD triggering time when –
measuring tripping current.
For RCD tA the following pa-
rameters are available:
UB voltage measured on PE, –
RE PE continuity, –
tA
RCD triggering time when –
given the rated dierential cur-
rent ratio.
MPI- USER MANUAL 536 –
65
Select to define the meas-
uring voltage.
Select the required measuring
voltage from the list.
If the RCD t A mode has been
selected in step , set the
forced current in the RCD test.
The set current is ratio of the
rated residual current of the
tested circuit breaker.
The correctness of the assess-
ment of the test circuit breaker
efficiency is dependent on the
rated residual current.
Rated differential currents of
RCDs are available in the
menu.
Touch the drop-down list field.
Select the residual current of
the test circuit breaker.
MPI- USER MANUAL 536 –
66
In the menu you can the wave-
form of the current, which will be
used to test the RCD.
Touch the drop-down list field.
Select the waveform of the
measuring current.
Determine the type of circuit
breaker.
Available circuit breaker types
general purpose
short-time delay type
selective
MPI- USER MANUAL 536 –
67
3.8.2 tripping current RCD
Connect the meter to the installation according to the drawing.
Select item RCD IA.
Enter the measurement settings in accordance with .section 3.8.1
The meter is ready for measure-
ment.
Live mode
U voltage between phase con-–
ductor L and PE conductor
f – network frequency in the tested
circuit
Press START to start the meas-
urement.
To cancel measurement, select
the icon on the screen.
MPI- USER MANUAL 536 –
68
Read out the result.
Measurement result assessment
green:
0.5 I ∆n < IA ≤ I∆n
red:
IA ≤ 0.5 I ∆n
or
IA > I∆n
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
Depending on the selection made
in section step some of 3.8.1
the parameters below will be dis-
played:
UB voltage measured on PE, –
RE PE continuity, –
tA
RCD triggering time with flow –
of RCD disconnecting current.
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . section 5.3
The last measurement can be recalled using the icon.
Measurement of the triggering time t Ai (tA measured during I A measurement) for se-
lective RCDs is not available.
The measurement of triggering time t Ai is not performed as required by applicable
standards (i.e current Iwith RCD nominal n ), but with I A current measured and
displayed during the measurement. In most cases where the measurement does
not have to be strictly as defined by the standard, this measurement may be taken
into account to assess the proper operation of RCD protection in a particular instal-
lation. When measured I A is lower than I n (most frequent case), then triggering time
tAi will be usually longer than the triggering time measured in function t A, which
measures the time at I n current:
IA < IΔn

tAi > t A
where:
tAi = f (IΔn)
Therefore, when time t Ai
is s correct (not too long), it may be assumed that the time
measured in function t A
would be also correct (it would not be longer).
MPI- USER MANUAL 536 –
69
Additional information displayed by the meter
Measurement in progress.
UB>UL!
The touch voltage exceeds a preset U L threshold value.
The meter is ready for measurement.
UL-N voltage is incorrect for making a measurement.
UL-PE voltage is incorrect for making a measurement.
UN-PE voltage is incorrect for making a measurement.
Phase connected to N terminal instead of L terminal (for
example, exchange of L and N in the mains socket).
Net ncy work freque is outside the range of 45...65 Hz.
PE conductor connected incorrectly.
Measurement error.
Before measurement, voltage at test terminals exceeds
500 V.
MPI- USER MANUAL 536 –
71
Read the result RCD triggering –
time t A.
Measurement result assessment
green:
tA ≤ tdop
red:
tA > tdop
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
Depending on the selection made
in section step some of 3.8.1
the parameters below will be dis-
played:
UB voltage measured on PE, –
RE PE continuity. –
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled us-section 5.3
ing the icon.
MPI- USER MANUAL 536 –
72
Additional information displayed by the meter
Measurement in progress.
UB>UL!
The touch voltage exceeds a preset U
L threshold value.
No UL-N!
Lack of neutral lead that is necessary for IΔ
n constant and pulsed with di-
rect current oset
The meter is ready for measurement.
UL-N voltage is incorrect for making a measurement.
UL-PE voltage is incorrect for making a measurement.
UN-PE
voltage is incorrect for making a measurement.
Phase connected to N terminal instead of L terminal (for example, ex-
change of L and N in the mains socket).
Maximum temperature of the meter is exceeded.
Net ncy work freque is outside the range of 45...65 Hz.
PE conductor connected incorrectly.
Measurement error.
Before measurement, voltage at test terminals exceeds 500 V.
Voltage exceeded.
MPI- USER MANUAL 536 –
74
3.9 Automatic measurements of RCD parameters
The meter enables user to measure automatically RCD triggering time (t A), disconnection current
(IA), contact voltage (U B) and resistance- -earth (Rto E). In this mode, there is no need to trigger each
measurement by pressing START button. The role of the user is reduced to initiating the measure-
ment by single pressing START and switching RCD on after each tripping.
3.9.1 Setting automatic measurements RCD parameters of
Select RCD AUTO .
Select U L and from then select the required measuring voltage from
the list.
Select the rated differential current of tested protection.
Select the type of tested protection.
Select the parameters to be measured. Designations:
IA tripping current
tA response time
+ current with increasing head is forced
- current with decreasing head is forced
x0.5 / 1 / 2 / 5 a multiplicity of RCD rated current, according to
IEC -6 61557
Select the metering mode:
full,
standard.
If full mode has been selected, select the type of tested protection.
RCD other than EV. There is no 6 mA DC module in this
type of device.
▼
EV type RCD. Here there is a 6 mA DC module. In this sit-
uation, before the test it is necessary to:
determine according to which standard the measure-
ment is to be carried out ( sec. 2.2.1),
determine the multiplication factor of the 6 mA DC dif-
ferential current ( button). The test settings vary de-EV
pending on the selected standard.
MPI- USER MANUAL 536 –
75
▼
RCM
▼
RCD other than the EV, which is protected by a RCM
(residual current monitoring device at 6 mA DC). In this sit-
uation, before the test it is necessary to:
determine according to which standard the measure-
ment is to be carried out ( sec. 2.2.1),
tick , RCM
determine the multiplication factor of the 6 mA DC dif-
ferential current ( button). The test settings vary de-EV
pending on the selected standard.
If standard mode has been selected, set the shape of the testing cur-
rent. In this mode, RCD EV and RCM tests are unavailable.
3.9.2 Automatic measurement of RCDs
Connect the meter to the installation according to the drawing.
Select RCDAUTO.
Enter the measurement settings in accordance with .section 3.9.1
MPI- USER MANUAL 536 –
76
The meter is ready for measure-
ment.
Live mode
U voltage between phase con-–
ductor L and PE conductor
f – network frequency in the tested
circuit
Press START to start the meas-
urement.
Tested RCD switch, must be
turned on after each triggering,
measurements are . completed
The progress of the measurement
is illustrated by progress bars:
top – progress of the ongoing
measurement,
bottom – progress of the entire
measurement sequence.
The sequence may be cancelled
at any time using icon .
Eventually, measured parameters
are displayed ( step sec. 3.9.1
), and:
UL test voltage, –
UL-PE voltage between L and PE, –
UB voltage measured on P –E,
RE PE continuity. –
The list of results may be scrolled
on the screen.
Symbols indicating correctness of
response
criterion met
criterion not met
For more information refer to Cri-
teria for assessing the correct-
ness of component results.
MPI- USER MANUAL 536 –
77
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in section 5.3.
The last measurement can be recalled using the icon.
UB and RE
are always measured.
The measurement of UB, RE is always performed with sinusoidal current 0.4 In re-
gardless of the settings concerning waveform and multiplication factor I
n.
Automatic measurement is interrupted in the following cases:
o the switch was tripped during the measurement of U
B, RE or tA at the half value
of IΔn,
o the switch did not trip during other component measurements,
o the value of pre-set voltage U
L has been exceeded,
o voltage was disconnected during one of the component measurements,
o values RE and mains voltage did not allow to generate the required current val-
ue for one of component measurements.
The meter automatically skips the measurements impossible to perform, e.g. when
the value of selected current IΔn and its multiplicity exceed the testing range of the
meter.
MPI- USER MANUAL 536 –
78
Criteria for assessing the correctness of component results
Parameter
Assessment criterion
Notes
IA
0.5 IΔn ≤ IA I≤ 1 Δn
-
IA
IA
0.35 IΔn
≤ IA I≤ 2 Δn
for IΔn = 10 mA
IA
IA
0.35 IΔn ≤ IA I≤ 1.4 Δn
for other IΔn
IA
0.5 IΔn ≤ IA I≤ 2 Δn
-
IA 6 mA
3 mA ≤ IA
6 mA ≤
for 6 mA RCD and RCM
(acc. to IEC 62955 and IEC 62752)
tA at 0.5 IΔn
tA → rcd
▪ for all types of RCD
▪ for AC module of RCD
tA
at 1 IΔn
tA
≤ 300 ms
▪ for general purpose RCDs
▪ for AC module of RCD
tA
at 2 IΔn
tA
≤ 150 ms
▪ for general purpose RCDs
▪ for AC module of RCD
tA
at 5 IΔn
t
A ≤ 40 ms
▪ for general purpose RCDs
▪ for AC module of RCD
tA
at 1 IΔn
130 ms ≤ tA
≤ 500 ms
for selective RCDs
tA
at 2 IΔn
60 ms ≤ tA ≤ 200 ms
for selective RCDs
tA
at 5 IΔn
50 ms ≤ tA ≤ 150 ms
for selective RCDs
tA
at 1 IΔn
10 ms ≤ tA ≤ 300 ms
for short-time delay RCDs
tA
at 2 IΔn
10 ms ≤ tA ≤ 150 ms
for short-time delay RCDs
tA
at 5 IΔn
10 ms ≤ tA
≤ 40 ms
for short-time delay RCDs
tA at 1 IΔn
tA s ≤ 10
for 6 mA RCD and RCM
(IΔ = 6 mA acc. to IEC 62955 and IEC 62752)
tA at 10 IΔ
n
tA
00 ms ≤ 3
for 6 mA RCD and RCM
(IΔ = 60 mA acc. to IEC 62955 and IEC 62752)
tA at 33 IΔ
n
tA
00 ms ≤ 1
for 6 mA RCD and RCM
(IΔ = 200 mA acc. to IEC 62955)
tA at 50 IΔ
n
t
A 0 ms ≤ 4
for 6 mA RCD and RCM
(IΔ = 300 mA acc. to IEC 62752)
MPI- USER MANUAL 536 –
80
3.10 Insulation resistance
WARNING
The tested object must not be live.
3.10.1 Settings of measurements
Connect the meter probe or the adapter which the measurements will be performed with.
Set the measuring mode. Positions will vary depending on whether the following have been
connected to the meter:
probes,
-Schuko adapter, UNI
AutoISO- adapter 2500
If separate leads with probes have been connected to
the meter, select the required option from the menu:
single measurement mode,
continuous measurement mode.
If UNI-Schuko adapter has been connected to the meter,
select the required option from the menu:
if the nductor on the rela-(L)(PE)(N) –phase co left
tive to the socket protective pin,
if the nductor on the rel-(N)(PE)(L) –phase co right
ative to the socket protective pin,
shorted L and N conductors, measure-(L+N)(PE) –
ment to PE (simplied method).
If AutoISO-2500 adapter has been connected to the me-
ter, select the required option from the menu:
measuring a 3-core cable, 3 wires –
measuring a 4-core cable, 4 wires –
measuring a 5-core cable. 5 wires –
Touch the drop down menu to set the measuring volt-
age Un.
Select the required measuring voltage from the list.
MPI- USER MANUAL 536 –
81
Double-lead measurement
Measurements with WS adapter
Select the type of network and the designation of the
measured pair of conductors.
Depending on your needs, set the following:
times t1, t2, t3 for calculating absorption coecients,
types of absorption coecients,
temperature coecients.
DAR = RISO_60s/RISO_15s
PI = RISO_10min/RISO_1min = RISO_600s/RISO_60s
When measuring the insulation resistance, the instrument may take into account the correction
factors k20 and k40 in accordance with the ANSI/NETA ATS-2009 standard, and thus convert
the measurement results to the reference temperature values.
After selecting the appropriate ratio, selection options are shown. The value of the coecients
may be entered:
directly - enter the coecient value manually,
indirectly - by setting the type of insulation of the tested object and the ambient temperature.
Then the instrument will automatically calculate the coecient value.
After conrming the settings, additional results will appear on the measurement screen.
RISO_k20
– insulation resistance converted to a temperature of 20°C thanks to the k20 coeffi-
cient:
RISO_k20 = RISO * k20
RISO_k40
– insulation resistance converted to a temperature of 40°C thanks to the k40 coeffi-
cient:
RISO_k40 = RISO * k40
MPI- USER MANUAL 536 –
82
Set the measurement duration using the icon. After the se-
lection has been made, it will display the set value.
Available opti ons
Auto the meter automatically selects measurement –
duration depending on the capacity of the object meas-
ured
30 s
60 s
Custom – manual setting of time within the range of 1…60 s
If the option has been selected, enter the required Custom
time.
Select Limit to set the acceptable insulation resistance criterion.
MPI- USER MANUAL 536 –
83
3.10.2 es Measurement using prob
WARNING
During measurements of insulation resistance, dangerous voltage up to 1 kV
occurs at the ends of test leads of the meter.
It is forbidden to disconnect test leads before the measurement is completed.
Failure to obey the above instruction will lead to electric shock with high volt-
age and make it impossible to discharge the tested object.
Select item RISO to call up the
measurement menu.
Connect the probes to the me-
ter.
Enter the measurement settings in accordance with section 3.10.1
Connect test leads to the measured object.
MPI- USER MANUAL 536 –
84
Press and hold the START
button The measurement is .
performed continuously when
the START is held in the
pressed position.
In order to the interrupt
measurement, press START.
If continuous measurement
has been selected (icon
), a will appear to prompt
conrm the start of the meas-
urement.
During the measurement the
H.V./REC/CONT. diode is lit
in . orange
Read the measurement result.
Signal lights for reaching the
limit ( step ) section 3.10.1
the result is within the
set limit
the result is outside the
set limit
assessment not possible
If continuous measurement
has been selected (icon
), the measurement can
be stopped by selecting the
icon.
The meter emits a continuous audio signal until test voltage reaches 90% of the preset
value (and also when 110% of the preset value is exceeded).
After completion of measurement, the capacitance of the object tested is discharged
by shorting RISO+ R and ISO– terminals with resistance of 100 kΩ.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage detected on terminals of the meter. Disconnects the termi-
nals from the test object.
Interference voltage occurs on the tested object. Measurement is possible
but may be burdened with additional uncertainty.
Current limit tripped. The symbol displayed during the measurement is ac-
companied by a continuous beep. If it is displayed after the measurement, it
means that the measurement result was obtained during operation with a cur-
rent limiting device (e.g. short circuit on the test object).
MPI- USER MANUAL 536 –
86
Press START to start measure-
ment.
If any of the voltages exceeds al-
lowable voltage value (50 V), Ob-
ject under voltage message is
displayed and the measurement
is blocked.
During the measurement the
H.V./REC/CONT. diode is lit in
orange.
View of the screen during meas-
urement.
The display shows the symbol of
the resistance being measured
and the progress bar of this
measurement.
The progress bar indicates the
status of the measurement.
The measurement may be can-
celled at any time using the
icon.
Read out the results.
Signal lights for reaching the limit
( step ) section 3.7.1
the result is within the set
limit
the result is outside the set
limit
assessment not possible
Additional signal lights for each of
the measured lead pairs
too strong interfenoise –r-
ence signal recorded
measurement taken limit –
at inverter current limit (e.g.
short circuit in the test ob-
ject)
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled us-section 5.3
ing the icon.
MPI- USER MANUAL 536 –
87
The meter emits a continuous audio signal until test voltage reaches 90% of the
preset value (and also when 110% of the preset value is exceeded).
After completion of measurement, the capacitance of the object tested is dis-
charged by shorting RISO+ R and ISO– terminals with resistance of 100 kΩ.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage detected on terminals of the meter. Dis-
connects the terminals from the test object.
Interference voltage occurs on the tested object. Meas-
urement is possible but may be burdened with additional
uncertainty.
Current limit tripped. The symbol displayed during the
measurement is accompanied by a continuous beep. If it
is displayed after the measurement, it means that the
measurement result was obtained during operation with a
current limiting device (e.g. short circuit in the test object).
MPI- USER MANUAL 536 –
88
3.10.4 2500 Measurements using AutoISO-
WARNING
During measurements of insulation resistance, dangerous voltage up to 1 kV
occurs at the ends of test leads of the meter.
It is forbidden to disconnect test leads before the measurement is completed.
Failure to obey the above instruction will lead to electric shock with high volt-
age and make it impossible to discharge the tested object.
Select item RISO, to call up the
measurement screen.
Connect AutoISO-2500 adapter.
The meter detects this fact auto-
matically and changes the ap-
pearance of the screen.
Enter the measurement settings in accordance with . section 3.10.1
The meter is ready for measure-
ment.
Live mode
U interference voltage –
MPI- USER MANUAL 536 –
89
Connect AutoISO- adapter to 2500
the lead tested.
Press START to start measure-
ment.
During the measurement the
H.V./REC/CONT. diode is lit in
orange.
If any of the voltages exceeds al-
lowable voltage value (50 V), Ob-
ject under voltage message is
displayed and the measurement
is blocked.
First, checking of voltages on par-
ticular pairs of wires is performed.
If any of the voltages exceeds al-
lowable voltage, the symbol of
this voltage is displayed (e.g.
VOLTAGE! L1PE), and the
measurement is interrupted.
View of the screen during meas-
urement.
The display shows the symbol of
the resistance being measured
and the progress bar of this
measuremen t.
The bar shows % of progress of
total measurement.
The measurement may be can-
celled at any time using the
icon.
MPI- USER MANUAL 536 –
90
Read out the results.
graph
results converted to refer-
ence temperature, coe-
cients
Signal lights for reaching the limit
( step ) section 3.7.1
the result is within the set
limit
the result is outside the set
limit
assessment not possible
Additional signal lights for each of
the measured lead pairs
noise – too strong interfer-
ence signal recorded
limit measurement taken –
at inverter current limit (e.g.
short circuit in the test ob-
ject)
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled us-section 5.3
ing the icon.
The meter emits a continuous audio signal until test voltage reaches 90% of the preset
value (and also when 110% of the preset value is exceeded).
After completion of measurement, the capacitance of the object tested is discharged by
shorting R
ISO+ R and ISO– terminals with resistance of 100 kΩ.
MPI- USER MANUAL 536 –
92
3.11 -voltage resistance measurement Low
3.11.1 Resistance measurement
Select item RX, to call up the
measurement screen.
Select Autozero to eliminate the
resistance of test leads.
Follow the on-screen prompts.
Description of function icons
Yes accept selection –
No cancels the action –
After selecting the meter will Yes
give the by the result reduced
resistance of test leads.
To of the disable compensation
resistance of leads, repeat steps
with test leads. open
Then the measurement result will
contain the resistance of test
leads.
The meter is ready for measure-
ment.
MPI- USER MANUAL 536 –
96
Read the measurement result.
The result is the arithmetic mean
of the values of two measure-
ments at a current of 200 mA with
opposite polarities RF and RR.
2
RF RR
R
Signal lights for the limit
(step )
the result is within the set
limit
the result is outside the set
limit
assessment not possible
After selecting the bar on the
right side, a menu will slide out
with additional measurement re-
sults.
RF result obtained for a –posi-
tive polarity of the measuring cur-
rent
RR result obtained for a –nega-
tive polarity of the measuring cur-
rent
Selecting the bar hides the
menu.
Save the measurement to the meter memory using the icon. A detailed description of
memory management is contained in . The last measurement can be recalled us-section 5.3
ing the icon.
Press the START button in order
to start the next measurement
without disconnecting test leads
from the object and proceed to
step .
NOTE!
Display of symbols indicates that the tested object is live. The
measurement is blocked. The meter must be immediately disconnected from the
object.
MPI- USER MANUAL 536 –
97
If the Autozero not deselected option was , (steps ), the meter invariably
reduces the measurement result by the resistance of the connected test leads.
Then, for each change of the leads, the procedure must be repeated. Autozero
The correction factor is also remembered after restarting the function and/or the meter.
If the test leads have been changed to such of a resistance than the previous lower
ones but the Autozero under- procedure has not been performed, the meter will
state the value of the measurement. In extreme cases, the meter may indicate a
negative resistance greater over-. Similarly, resistance of the leads causes an
stated result of the measurements.
Maximum compensation of test leads resistance (Autozero) equals 500 Ω.
Additional information displayed by the meter
The meter is ready for measurement.
Measurement in progress.
Too high voltage on the tested object.
Interference voltage occurs on the tested object. The meas-
urement is possible however it will be burdened with addi-
tional uncertainty that is specied in the technical data.
MPI- USER MANUAL 536 –
98
3.12 Phase sequence
Select item , to Phase sequence
call up the measurement screen.
Connect the meter to the installation according to the drawing.
The meter ready for testing.
UL1 L2- , UL2 L3- , UL3-L1
values of phase- -phase voltag-to
es
signalling the presence of indi-
vidual phases
The phase sequence is correct ,
i.e. the phase sequence is in
clockwise direction.
MPI- USER MANUAL 536 –
99
The phase sequence is incor-
rect, i.e. the phase sequence is
in direction. anticlockwise
3.13 Motor rotation direction
Select item , to Motor rotations
call up the measurement
screen.
The meter ready for testing.
Connect the meter to the mo-
tor according to the drawing,
i.e. U terminal do input L1, V
to L2, W to L3.
Vigorously rotate the motor
shaft to the right.
MPI- USER MANUAL 536 –
100
Arrows on the screen rotating
to the right mean that the mo-
tor connected to a 3-phase
network will rotate the shaft to
the right.
Arrows on the screen rotating
to the left mean that the motor
connected to a 3-phase network
will rotate the shaft . to the left
Do not move the test leads during the test.
Moving disconnected test leads, may induce voltages that result in indicating the di-
rection of rotation.

Produktspecifikationer

Varumärke: Sonel
Kategori: Mätutrustning
Modell: MPI-536

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Mätutrustning Manualer

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