The loop resistance tester is also called contact resistance tester. This instrument is used to test the contact resistance and loop resistance measurement of switch control equipment. What steps are required to use the loop resistance tester and how to use this instrument? The following content will Tell everyone.

First, according to the four-wire measurement method, connect the test product to the surface plate of the instrument with the test cable. There are corresponding color plugs on the surface plate. Just plug the corresponding color cable on it. When inserting, you need to pay attention to the voltage measurement line should be connected. Inside the current output line.

Then turn on the AC220V power supply. Note that the third wire of the power supply line, the protective ground, must be connected to the ground. After receiving it, press the power switch. At this time, the ammeter and resistance meter will display "000".

Press the measurement switch again. At this time, we can adjust the current output knob to the current meter head in a clockwise direction. The screen displays "100.0". After the display, the number on the resistance meter head can be read, which is the resistance value of the tested product. Record the data at this time.

After the test, turn the current output adjustment knob to small in the counterclockwise direction, reset the measurement switch, and then turn off the power switch. If you need to repeat the test, just reset the measurement switch as you just started, re-clamp the test clamp, and press the measurement switch again.