Unit UT620C Manual de usuario

110401111444X

Contents

Ⅰ. Safety Information .....................................................................................2

Ⅱ. Overview ...................................................................................................2

Ⅲ. Range and Accuracy .................................................................................3

Ⅳ. Technical Specifications ............................................................................ 3

Ⅴ. External Structure .....................................................................................5

Ⅵ. Operating Instructions ............................................................................... 5

1. Power on/off ................................................................................... 5

2. Check battery voltage ....................................................................5

3. Resistance precision testing .......................................................... 6

4. Backlight control .............................................................................8

5. Data hold/storage ........................................................................... 5

6. Data viewing/deletion ..................................................................... 9

7. Data upload .................................................................................... 9

8. Line resistance calibration (clear residual resistance) .................. 10

Ⅶ. Battery Description .................................................................................. 10

Ⅷ. Packing List ............................................................................................. 11

I. Safety Information

Thank you for purchasing the product, for better use, please read the user

manual carefully andfollow the safety information below.

Pay special attention to safety when using the product.

Do not measure any live object. Make sure that the resistor or metal object to

be measured is de-energized before measurement, otherwise, it may damage the

product.

When low battery symbol appears, please charge the product in time (the

charging time is 5~8 hours).

Please charge the battery once a month or two months if the product is not used

for a long time.

Please stop use immediately in case test lead is broken during use.

Do not place or store the product in environments with high temperature, high

humidity, dews, and direct sunlight for a long time.

Perform regular maintenance, keep product and test leadsclean. Avoid drop or

impact.

Use, dismantling or repair shall be performed by authorized professional.

If danger caused by the product occurs, please stop use and seal the product

immediately, and send it to authorized center for maintenance.

The symbol “ ” affixed at product and shown in user manual indicates user

must operate according to the instruction.

II.Overview

Digital Micro Ohm Meter (also known as Micro Ohm Meter, Ohm Meter, and DC

Resistance Tester) adopts micro-processor technology and 4-wire testing method

to make measurement safe, accurate and reliable.

The meter is mainly applied to measure resistance of conductor, contact resistance

of switch, connector and relay, resistance and contact resistance of coil, motor and

transformer winding.

It can also test connection resistance and low resistance between metal parts,

resistance and contact resistance of connecting conductors between grounding

electrode of ground grid.

The product consists of meter, monitoring software, test leads, communication

cable, etc. Featuring a large LCD, the tester enables user to view the data easily.

It can store 500 groups of data. The measured resistance ranges

ftware of master computer has multiple functions including data

viewing, data accessing, data storage, report generation, etc.

III. Range and Accuracy

Model

Range

Accuracy

Resolution

Max.

Testing

Current

UT620C

±0.1%FS±20dgt

(18°C~28°C;

<70%rh)

1.2A

0.5A

0.05A

5mA

~100.00

0.5mA

0.05mA

Note: ±0.2%FS±20dgt (18°C~28°C; >70%rh / -10°C~50°C; <80%rh)

IV. Technical Specifications

Function

The meter is mainly applied to measure resistance of

conductor, contact resistance of switch, connector and relay,

resistance and contact resistance of coil, motor and

transformer winding. It can also test connection resistance

and low resistance between metal parts, resistance and

contact resistance of connecting conductors between

grounding electrode of ground grid.

Testing method

4-wire method

Testing current

Open-circuit

voltage

4.2V

Power

Power supply

DC 3.7V 2000mAh lithium battery

Backlight

Controllable backlight on off-white screen (applicable to use

in dark environments)

Display mode

LCD display; backlight on off-white screen

LCD size

71mm*52mm (L*W)

Product

dimensions

187mm*191mm*51mm (L*W*H)

Length of test

lead

About 70cm (red test lead: 1pc; black test lead: 1pc)

Measurement

time

About 2 times per second

USB port

Micro USB port

Communication

cable

Micro USB cable (1pc)

Data storage

Store 500 groups of data. “MEM” to indicate storage; “FULL”

to indicate full storage.

Data viewing

Symbol “MR” appears

Overrange

indication

Symbol “OL” appears

Battery voltage

Battery voltage is displayed in realtime. Please charge the

battery in time if the meter indicates low battery.

Auto power off

“APO” to indicate auto power off. The meter powers off

automatically after 15 minutes of inactivity.

Power

consumption

Standby: About 100mA (with backlight off)

Backlight: About 105mA

Measuring: 2A Max.

Weight

Meter: 480g (including battery)

Test leads: 250g

Operating

temperature and

humidity

-10°C~50°C;

70%rh

Storage

temperature and

humidity

-20°C~60°C;

70%rh

Overload

protection

AC 220V/0.0001s (C1-C2, P1-P2). After performing

overload protection, please restart the meter for normal

testing.

Insulation

resistance

Withstand

voltage

AC 3700V/rms (between circuit and casing)

Electromagnetic

characteristic

IEC61010-4-3. Electromagnetic field of radio frequency is

1V/m

Applicable

regulation

IEC61010-1, CAT III 600V, Pollution Class 2, JJG724-1991

“Verification Regulation of DC Digital Ohmmeter”, JJG166-

1993 “Verification Regulation of DC Resistors”, “DL/T967-

2005 Verification Regulation of Loop Resistance Tester and

DC Resistance High-Speed Tester”

V. External Structure

1. USB transmission/charging port

2. Charging indicator light

3. Connectors for test leads

4. LCD display

5. Rubber insulation protector

6. Functional buttons

7. Test leads (red: 1pc; black: 1pc)

VI. Operating Instructions

1. Power on/off

Press “ ” to power on/off the meter. “ ” appears on the bottom right corner

of the LCD after the meter powers on. The meter powers off automatically after

15 minutes of inactivity.

2. Check battery voltage

If low battery symbol “ ” appears on the LCD after the meter turns on for 2 to

4 seconds, it indicates the battery voltage is low, in such case, please charge the

battery in time. Sufficient battery voltage ensures measurement accuracy. The

battery indication bars decrease as the battery voltage decreases.

3. Resistance precision testing

Please clear the insulation layer and the oxidation layer on the

surface of the object to be measured before test.

Do not perform live test for resistance or DC low resistance. Live

test may damage the meter.

Test clips may be oxidized after they are used for a long time. To

ensure good contact of clips, please clear the oxide and the foreign

object at the clips.

Make sure the connection between test leads and tester/measured

object are reliable.

Component heat during test may cause error, thus it is

recommended to perform test for 30 seconds, with testing interval

at 30 seconds.

If the symbol “OL” appears during test, it indicates the resistance

between measured points exceeds the range. Please restart the

meter and then retest to troubleshoot fault caused by overload

protection, if the fault is caused by overload protection, it indicates

the measured resistor is energized, please de-energized the

measured resistor immediately and restart the meter for retesting.

Or please check if poor contact of test leads occurs (the circuit

between measured points may be open).

Measure resistance by connecting the meter with the resistor

Measured resistor RX

Black

Red

Measure the resistance between electric meter and down conductor

Measure the resistance between metal connectors

Metal connectors

Black

Red

Black

Down conductor

Equipment

grounding wire

Grounding wire of electric meter

Copper busbar

Measure the resistance of contact points of relay

4. Backlight control

In power-on state, press “ ” to turn on/off backlight. The backlight function

applies in dark environments. The default state of backlight is off when powering

on the meter.

5. Data hold/storage

After the meter is powered on or measurement is completed, press “ ” to hold

the current displayed data, press “ ” to perform numbering automatically

and store current displayed data. The symbol “ ” appears on the LCD if storage

“ ” is pressed.

Red

Black

Relay

6. Data viewing/deletion

After the meter is powered on or measurement is completed, the meter switches

to data viewing mode and “ ” appears on the LCD when “ ” is pressed.

Press “◀” or “▶” to set the step as 1 (group), press “ ” or “ ” to set the step as

10 (groups). Press “ ” or press “ ” for twice to exit the mode and return to

testing mode.

As show below, the number “1” at top right is the number of group. If no data is

stored, “ ” appears on the LCD.

In data viewing mode, press “ ” to switch to data deletion mode. Press “ ”

or “ ” to select “ ” or “ ”. When pressing “ ” and then pressing “ ”, the data

will not be deleted and the meter returns to testing state. Press “ ” and then

press “ ” to delete all stored data. After deletion, the display is showed as below:

7. Data upload

Connect the meter with computer via USB cable, turn on the meter, then operate

the software of master computer. If USB connection is successful, the stored data

can be viewed, uploaded and saved.

The software of master computer has multiple functions including data viewing,

data accessing, data storage, etc.

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