DC resistance testerSeveral usage methods

1. Power supply

The DC resistance tester provides two types of power sources for testing: AC220 V/DC12V. In the case of strong electromagnetic field interference, it is recommended to use a DC power supply for testing. The values tested in this state are stable and have strong resistance to power frequency interference.

A、DC resistance testerAC power test:

Connect the AC 220V power supply, and the corresponding indicator light will turn on. Close the main power switch, and the corresponding indicator light will turn on. Press the "start stop" button to start the test. After the test is completed, turn off the main power switch (AC220V), the corresponding indicator light will turn off, discharge, and then switch to the test clip for retesting.

B、 charging

Connect the AC 220V power supply, and this charging indicator light will turn on, indicating that the rechargeable battery inside the machine is being charged. The instrument is being tested using AC power and is also charging the internal battery. The instrument is designed with a charging protection circuit to prevent overcharging.

C、 DC power supply test:

Close the main power switch (DC12V), and the corresponding indicator light will turn on. Close the main power switch, and the corresponding indicator light will turn on. Press the "start stop" button to start the test. After the test is completed, turn off the main power switch (DC12V), the corresponding indicator light will turn off, discharge, and then switch to the test clip for retesting.

2. Connection method of test line:

Connect the I+, V+, V -, and I terminals of the instrument to the test sample using the method shown in Figure 1

Connect well. This connection method can eliminate the contact resistance at points A, B, C, and D, as well as the influence of wire resistance on measurement. The measured value is the resistance Rx between B and C (note: do not reverse between B and C).

In use, if the length of the test wire that comes with the instrument is not sufficient, a wire with a diameter equivalent can be used to extend the test wire.

3. Discharge:

After the test is completed, the main power can be directly turned off. If it is an inductive test sample, the wire should not be disconnected immediately after turning off the power, and the instrument should have a continuous discharge process. Generally, discharge for at least 20 seconds, otherwise the back electromotive force of the inductor may endanger personal safety.

4. Measurement:

　　DC resistance testerWhen the circuit is not properly connected, the startup header displays "E0000". After connecting the measuring wire according to the method in Figure 1, select the desired resistance level based on the size of the measured value, press the switch for that level, and the indicator light for that level will light up. The stable value displayed on the four and a half digit LCD is the measured resistance value. Please pay attention to the units on the selected range when reading values. When measuring large inductance samples such as power transformers, short-circuit other coils outside the testing circuit that do not require measurement to avoid electromagnetic interference.