Possible reasons and solutions for insulation resistance meter not returning to zero

1, Possible reasons and solutions
1. Residual potential after measurement
If the measurement is not reset to zero in a timely manner after completion, it may lead to the existence of residual potential, causing measurement results to drift and affecting subsequent measurements. The solution is to reset it to zero before measurement, or replace it with a higher precision resistance meter for measurement.
2. Improper error adjustment
Improper error adjustment may also cause the resistance meter to not return to zero. The solution is to make the correct error adjustment. The specific method is to adjust the pointer of the insulation resistance meter to the rightmost end, and then use the potentiometer to make slight adjustments until the pointer returns to zero.
3. Incorrect wiring
Incorrect wiring may also cause the insulation resistance meter to not return to zero. It is necessary to check whether the wiring is correct, especially when using a multifunctional resistance meter, to ensure that the correct measurement mode is selected.
2, Correct operation and maintenance methods
1. Correct operation
To use an insulation resistance meter, one should have certain professional knowledge and skills, and pay attention to the following points:
(1) First, connect the ground wire, and then perform a circuit disconnection test;
(2) Pay attention to whether the power supply voltage is appropriate and choose the correct range;
(3) Clear the header before operation;
(4) Handle with care during operation to avoid collisions and vibrations.
2. Maintenance and upkeep
(1) Regularly reset the header to avoid measurement errors;
(2) Pay attention to keeping the instrument dry and avoid moisture damage;
(3) Regularly calibrate and test instruments to ensure accurate test results.
In short, the failure of the insulation resistance meter to zero may be caused by various reasons, and it is necessary to perform correct operation and maintenance during use to ensure the accuracy and stability of the test results.