UNI-T UT502C (01) PDF Document

To ensure safe operation of the UNI-T UT502C, please observe the following safety instructions:

Danger:

Do not measure in circuits with voltage above AC 750V.

Do not test in flammable places. Sparks may cause an explosion.

Never use the Tester if its surface or the operator’s hands are wet.

Do not touch the live part of test probe during measurement.

Never open the battery cover during measurement.

Do not touch the circuit under test when measuring insulation resistance.

Warning:

Stop using the Tester if it behaves abnormally (such as bare test lead, damaged tester).

Be cautious when the test is conducted under voltage above 30Vrms, 42.4Vacrms or 60Vdc, such voltages may pose a shock hazard!

Do not replace the battery in damp environments.

Ensure secure connection between all test leads and test ports of the Tester.

Please switch off the Tester and remove the test leads before replacing the batteries.

Caution:

Before measuring insulation resistance, the circuit to be tested must be fully discharged and separated from other power circuits.

If the test leads appear damaged, replace them by test leads with same model and electric specification.

Stop using the Tester when the symbol indicates low battery. If the Tester is not used for an extended period of time, please store the Tester after removing the battery.

Do not use or store the Tester in high temperature, high humidity, flammable, explosive or strong magnetic field environments.

The symbols associated with the UNI-T UT502C are defined as follows:

The insulation resistance test index for the UNI-T UT502C is as follows:

The UNI-T UT502C includes the following functions and features:

Auto-range function: The device automatically adjusts the measurement range.

Auto power off function: The Tester powers off automatically after 10 minutes of inactivity.

Data hold: The data hold function is enabled when measuring insulation resistance; it is disabled for AC voltage measurement.

Insulation Resistance Alert: The measured insulation resistance itself is charged (>30V), the symbol will flash when insulation resistance test function is turned off.

Full Display on Startup: After starting up, full display will appear on the LCD for about 1 second.

Low Battery Indication: When the battery power is ≤7±0.2V, the battery symbol lights up; when the battery power is ≤6.4V, the symbol flashes 10 times and the Tester shuts down automatically.

Adapter Priority: Powered by adapter (without charging function): the adapter symbol is displayed in priority when charged by adapter, battery symbol is not displayed.

Overrange Indication: Overrange indication for insulation resistance measurement is “>110MΩ”, “>550MΩ”, “>2.20GΩ”, “>5.50GΩ”, or “>22.0GΩ”; overrange indication for AC voltage is “>750V AC”.

Auto Backlight: The backlight lights up for about 5 seconds when the Tester is turned on. It automatically turns on when measurement starts for insulation resistance test, and it automatically turns off when the measurement stops. The backlight function is disabled for AC voltage measurement.

Red Warning Light: The light is on when high voltage is output.

The external structure of the UNI-T UT502C consists of:

1) EARTH: Terminal for insulation resistance sampling test

2) GUARD: Negative input terminal for voltage test lead

3) ACV: Positive input terminal for AC voltage test lead

4) LINE: Terminal for high voltage output test lead

5) Liquid Crystal Display

6) High voltage output warning indicator

7) Insulation resistance test buttons

8) Functional rotary switch

9) Alligator clip

10) Test probe

11) Alligator clip

12) Test lead

13) Power adapter port

The LCD description for the UNI-T UT502C is:

Note: Do not measure AC voltage over 750V to avoid damage to the Tester. Considering external interference during AC voltage test, ACV and GUARD test probes can be used to short-circuit for zero calibration.

1. Turn the rotary switch to the ACV position for AC voltage measurement.

2. Connect the red test lead to the “ACV” input terminal, and connect the black test lead to the “GUARD” input terminal.

Caution: Make sure that the circuit to be tested is fully charged; do not measure live devices or circuits. Do not touch the circuit after the test is completed; the capacitance stored in the circuit can pose electric shock. Disconnect the test lead from the connected circuit and do not touch by hands until test voltage is fully discharged.

1. Press the functional knob to select a test voltage:

(1) Before measuring insulation resistance, the circuit to be measured must be fully discharged and separated from power circuit.

(2) Connect red test lead to “LINE” input terminal, and connect black test lead to “EARTH” input terminal.

(3) Connect red and black alligator clips to the measured circuit; the voltage is output from the LINE terminal.

2. Continuous measurement operation:

After selecting a test voltage, press and rotate TEST to LOCK position for continuous measurement. The output insulation resistance test voltage indicator lights up red. After the test is completed, press and rotate TEST button to unlock and stop the test.

Common two-wire measurement connection method:

Test whether there is leakage current in the two conductors of the same cable. Connect the two ports of the insulation resistance test to the metal body of the two conductors in the same cable. Measure the insulation resistance between the two conductors.

Common single-wire measurement connection method:

Measure the resistance value between the conductor wire and the bare metal wire to determine whether there is leakage current in the conductor.

Follow these steps to replace the batteries:

1. To avoid electric shock, turn the functional rotary switch to OFF position to power off the Tester and remove test leads before replacing the batteries.

2. Unscrew and remove the battery cover to replace with 6pcs 1.5V AA alkaline batteries.

3. Tighten the screws after the replacement.

Caution: Do not mix new and old batteries. The same brand of battery is recommended. Pay attention to the battery polarity when installing batteries. Do not measure if the battery compartment is open.

1. Power off the Tester and remove all test leads before switching batteries and power adapter.

2. Use dedicated power adapter only (Model: XZF48-15600D).

3. Connect the power adapter to the power port of the Tester before measurement.

Clean the Tester housing:

1. Wipe the Tester housing with a soft cloth or sponge dampened with clear water.

2. Do not use abrasives or solvents.

3. Do not immerse the Tester in water to avoid damage. If water gets into the Tester accidentally, please have it repair by a professional.

4. If the Tester is wet, allow time for drying before storing it.

5. Have a qualified professional or designated department repair or service the Tester.