- Reaction score
- 17,132
Not long just usually press test and within seconds it gives me reading it's the et4000 if that helps
If you carry out IR testing like that then you have to expect to get readings like this on long cables.
The cable forms a capacitor and you need to apply the test voltage for long enough to fully charge this capacitor, otherwise you will not be measuring the resistance of the insulation but will just get a slightly random number.
re-test the cable, but this time make sure you allow long enough to overcome the effect of the capacitance of the cable.
Don't forget to safely discharge the stored energy in the cable.