Some customers may find that the resistance of the wire tester is always larger than the set value. This is because the wire tester itself has a certain resistance, and the adapter also has some resistance. So when the customer tests the wire, they will find the resistance is very high.
In this case. We must finish the fixture. Make an action. The fixture returns to zero. In the first step, short-circuit all the points of A end. The fixture returns to zero. Then short-circuit all the B endpoint bits and return the fixture to zero. Test again.

Wire conduction and resistance have a great relationship, but many people do not know the factors affecting the wire resistance, the application of wire testing machine can be very convenient to test the wire resistance is how much, greatly convenient for the factory test coherent wire.

Insulation resistance on electrical equipment refers to the ratio of the dc voltage U applied on the electrical insulation material to the total conductance current through it.
The effect of temperature on insulation resistance: as the temperature rises, the insulation resistance of many insulating materials will decrease, because the increase of temperature makes the insulation atoms move more, the original molecular structure becomes lax, and the charged ions move under the action of electric field and transfer electrons, so the insulation ability of the insulation material will decrease.
The influence of the test time of wire tester on the insulation resistance test: because of the residual charge during repeated measurement, the charging current and receiving current obtained from repeated measurement are smaller than the previous one, resulting in a false increase of insulation resistance. Therefore, after each insulation resistance test, the measured material should be fully discharged, so that the discharge time is longer than the charge time, in order to facilitate the discharge of residual charge.