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Uni-T Multimeter UT521

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1.Safety Information

This operation manual includes the safety information related to the operation of the

tester, please read them carefully before using the tester.

Before using the Tester, please read through and understand the operating

manual.

Please keep the Operating Manual properly for future use.

Use the Tester as specified in the Operating Manual.

Please understand in detail the Safety Information section of the manual.

Strictly follow the Safety Information, otherwise it may cause personal injury or

damage to the Tester.

Danger identifies co itions a nd nd actions that most kli ely p e h dos azar (s)

to the user.

Warning identifies conditions and actions that may pose hazard(s)

to the user.

Caution identifies conditions and actions that may cause minor

injury or damage to the Tester.

Safety sign " "has 3 meanings in this manual, the user has to pay attention to

this sign " " for operation.

Danger

Do not use the Tester around explosive environment, which may cause fire and

explosion.

Do not make any connections when the Tester is wet or the operator's hands

are wet.

Do not apply any voltage beyond the rating or specified range of the Tester.

Do not open battery compartment while testing.

Warning

Do not use the Tester if it is damaged or metal part is exposed.

Do not disassemble the tester randomly. If it needs repair, please contact

our after-sales services or our agents.

Do not change battery or open battery compartment when the Tester is wet.

clean it with dry soft cloth first.

Make sure the Tester is turned off when changing battery or opening the battery

compartment.

Caution

Ensure test leads are inserted into the corresponding port before measurement.

Take the battery out from the Tester if it is not used for a long time.

Do not expose the Tester in extreme temperature and wet environment.

Soft cloth and mild detergent should be used to clean the surface of the Tester

No abrasive and solvent are allowed.

Dry the tester before storing if it is wet.

Electrical Symbols are used on the Tester or in the manual:

danger, warning and caution icon double for rein orced insula io t n

Alternating Current Grounding

Conforms to Standards of European Union

2. Features

The Tester is designed with intelligent micro-controller chip and offers high accuracy

and reliability. It can measure earth resistance of earth ground devices of electric

power installations, electrical appliances, lightening protection systems, etc, and also

measure earth voltage(It is highly recommended not to use the Tester under severe

outdoor environments such as raining or thunder).

Compliances:

IEC 61010-1 CATIII 600V Pollution Degree 2

IEC 61557-1,5

IEC 61010-2-31

Range

Earth Voltage

Measure Range

0V~200V(50/60Hz)

Earth

Resistance

Best Accuracy

(1.0%+4)

(2.0%+10) (20 position)

(2.0%+3)(200 or 2000 position)

(Auxiliary earth resistance 500

(accuracy 5%);earth voltage 10Vac)

0.00 ~20.00

0.0 ~200.0

0 ~2000

200

2000

Measure Modes:

(1) Earth Voltage average respondMeasurement:

(2) Earth Resistance signal frequency : around 820Hz,Measurement: Test

current: around 3.2mA at 20Ω range.

Measuring scope(Max. deviation:±30%):

20 Range : 5.00 ~20.00

200 Range : 20.0 ~200.0

2000 Range : 200 ~2000

Working condition:

Temperature:5 ~40

Relative humidity: 80%RH(no fog)

Altitude: 2000 m

Storage condition:

Temperature:-20 ~60

Relative humidity: 75%RH(no fog)

Power: [1.5V Alkaline Battery (AA)*6]

Overload protection:

Earth Resistance ranges: 200 Vac (10 seconds)

Earth Voltage:400 Vac (30 seconds)

Insulation Impedance:

＞20MΩ between measure circuits and the casing.

Product size:160mmx70.5mmx100mm.

Product Weight:around 560g.

Accessories:

Green test lead (5 m)

Yellow test lead (10 m)

Red test lead (20 m)

Auxiliary earth stakes

Simple test leads with alligator clips

1.5V Alkaline Battery (AA)

Carrying bag

English manual

1 pc

2 pcs

1 set

6 pcs

1 set

1 pc

●

Backlight LCD;

●

Battery Check;

●

Data Hold& Data Storage(up to 20 sets);

●

Auto Power Off;

●

Offer Precision Three-Wire & Simple Two-Wire Measurements;

●

“- - - - Ω” Indication for Bad Connection to C or E Terminal When Measuring

Earth Ground Resistance;

●

“OL” Overloaded Indication;

●

Double-or Reinforced-Insulated structural Design.

4. Tester Structure&Accessories (Figure 1)

Figure 1

LCD Display

LIGHT/LOAD button

HOLD/SAVE button

TEST button

Rotary switch for function

selection

Input terminals

Standard 3-Wires test leads

Simple 2-Wires test leads

Auxiliary earth stakes

5. Preparations before Measurement

5.1

Battery check: Set the rotary switch to earth voltage or earth ground resistance

ranges, if “ ” shows, it indicates the battery is very low and needs to be

replaced timely, otherwise the Tester may be unable to work normally.

3. Technical Specifications

Measuring Range and Accuracy(under 20 5 & 75%RH):

Battery sign Battery Voltage

8.2V

7.8V~8.2V

7.4V~7.8V

7.0V~7.4V

Produktspecifikationer

Varumärke:	Uni-T
Kategori:	Multimeter
Modell:	UT521
Produkttyp:	Digital multimeter
Typ av operation:	Knoppen
Färg på produkten:	Zwart
Vikt:	880 g
Bredd:	190 mm
Djup:	103 mm
Höjd:	29 mm
Snäll:	AV-zender
LED-indikatorer:	Link, Power
På / Av knapp:	Ja
Anslutningsteknik:	Bedraad en draadloos
Ethernet LAN:	Ja
Maximal upplösning:	1920 x 1200 Pixels
Inkluderar AC-adapter:	Ja
VGA (D-Sub) port(ar):	1
Certifiering:	CE, VESA
HDCP:	Ja
Maximal uppdateringshastighet:	30 Hz
Anslutning för nätadapter:	Ja
Material:	Metaal
HDMI-version:	1.4
Grafikupplösningar som stöds:	1920 x 1200 (WUXGA)
Fjärrkontroll (IR) ingång:	1
VGA (D-Sub) ingångsportar:	1
DisplayPorts in:	1
Bakgrundsbelysning:	Ja
Extern anpassning:	Ja
Utström:	1 A
Fjärrutgång (IR).:	1
Power over Ethernet (PoE):	Ja
HDMI in:	1
RJ-45 utgångsportar:	1
RJ-45 ingångsportar:	1
Maximal-räckvidd:	70 m
Strömförbrukning (typiskt):	12 W
Drifttemperatur (TT):	-10 - 55 °C
Relativ luftfuktighet i drift (VV):	5 - 95 procent
HDCP & EDID bypass:	Ja
Kabeltyper som stöds:	Cat6, Cat7
3,5 mm in:	Ja
3,5 mm utgång:	Ja
Driftspänning (sändare):	24 V
Produktstorlek (BxDxH):	160 x 70.5 x 100 mm
Batterispänning:	1.5 V
Batterier medföljer:	Ja
Displaytyp:	LCD
Data håller:	Ja