Megger LT7 Bruksanvisning
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Digital Loop Tester
M LT7
User Guide
Guide de l’utilisateur
Gebrauchsanleitung
Guía del usuario
NOTE
THE INSTRUMENT MUST ONLY BE USED BY SUITABLY TRAINED AND
COMPETENT PERSONS
.
Symbols used on the instrument
Caution: refer to accompanying notes.
Equipment protected throughout by Double Insulation
(Class II)
Equipment complies with relevant EU Directives
SAFETY WARNINGS
✱ Safety warnings and precautions must be read
and understood before the instrument is used.
They must be observed during use.
✱ Continuity of protective conductors and earthed
equipotential bonding of new or modified
installations
must be verified before carrying out
an earth fault loop impedance test.
✱ Exposed metalwork of an installation or
equipment under test
must not be touched.
✱ LT7 must not be connected across two phases
of a 3 phase supply.
✱ The LCD neon voltage indicators cannot reveal a
Neutral - Earth reversal.
✱ Loop impedance <0,01Ω must be investigated.
✱ Test leads, probes and crocodile clips must be in
good order; clean, and with no broken or cracked
insulation. Avoid drawing excessive arcs on high
current tests.
✱ The mains power cord forms part of the
measuring circuit of the instrument. This test lead
must not be modified or changed in any way, or
be used in any other electrical instrument or
appliance.
✱ The instrument must not be used if any part is
damaged.
✱ Use of the instrument in any unspecified manner
may impair the protection provided.
Battery Replacement:
For safety reasons, the battery compartment must not be opened if the test
lead(s) are connected. Undo the two screws in the instrument base to
access the battery compartment, and replace the battery cells. The
instrument will beep. Ensure that correct polarity is observed and that the
cover is correctly replaced.
GENERAL DESCRIPTION
The Megger LT7 Digital loop tester is a compact portable instrument
designed to measure earth loop impedance and prospective short circuit
current. A special range is provided to carry out loop measurement on
installations protected by Residual Current Devices ≥30mA without causing
the breaker to trip out. The resolution in this range (1Ω) is more than
adequate for this purpose. Should greater resolution be required (0.01Ω)
the conventional 23A range can be used.
O
200 /2k
AUTO
20
23A
23A
PSCC
15mA
RETEST
N-PE
L-PE
MEGGER
®
LT7
DIGITAL LOOP TESTER
L-PE
k A
N-PE
Vk
Features
Retest
Push button
Digital LCD
Low Battery
Indicator
Thermal
Protection
Indicator
‘Excessive
Noise’
Indicator
Phase/Earth
Voltage
Indicator
Neutral/Earth
Voltage
Indicator
4 Position
Rotary
Switch
Prospective
Short Circuit
Current
Measurement
High Current
(23A) Loop
Measurement
Low current
(15mA) Loop
Measurement
Battery
Compartment
Cover
Produktspecifikationer
| Varumärke: | Megger |
| Kategori: | mätning |
| Modell: | LT7 |
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