How to use the loop resistance tester?
1. according to the four lines measuring method, with the special test line will be connected to the test panel, pay attention to the voltage measuring line should be connected to the current output line inside.2. turn on the AC220V power supply and press the power switch. At this point the ammeter and the resistance meter show "000"".3. according to the measuring switch, adjust the current output knob to the current meter to show "100", then read the value on the meter, which is the resistance value of the tested product, and record it.4. after testing, adjust the current output adjustment knob to the minimum, reset the measurement switch, and then cut off the power switch.5. if you want to repeat the test, just reset the measuring switch, clamp the test tongs again, and then press the measuring switch.
Loop resistance tester: according to the electrical equipment preventive test procedures DL/T 596 - 1996 requirements, all kinds of switching equipment conductive circuit resistance test, its test current shall not be less than 100A. Because of contact oxidation, cause contact as a result of bad fastening contact resistance increases, the current flowing through the contact point when temperature rises, the more accelerated contact surface oxidation, to further increase the contact resistance, continue to produce serious accidents, so it is necessary to often or regularly on the contact resistance measurement.
