How to test a cable with a VC60B+

[Dude McGee]

Hello,

I've purchased a VC60B+ a few days ago, which is an insulation tester branded under different names (Victor, Vici, and others).

It came with a Chinese manual which I can't read. On the net you find these manuals:

https://core-electronics.com.au/attachments/VC60B+%20User%20Manual%20(English).pdf

http://www.analogti.com/document/VC60B.pdf

http://micromir-nn.ru/insulation/VC60B.pdf

The sentence which confuses me is this:

"6、When measuring cable, connect G Terminal to the protection loop."

Normally, you have to connect L and E, the two outmost terminals, in order to measure the isolation resistance. For which purpose should I have to use G? And, should G be connected to the earth conductor of the cable? And, what could be the possibly adverse effect if I don't comply to this rule?

The biggest problem with such a low-cost device is probably that you don't receive a proper and responsibly written manual in a good language, at least neither in German nor in English. These translations from Chinese to whatever are between totally useless or at least dangerously confusing... So, to get an advice from an experienced electrician would be great! I'm just a beginner and mere amateur...

Thanks a lot beforehand,

have a good time,

Hartmut

[Maxlor]

Have a look at the manual for this Fluke insulation tester: https://www.distrelec.ch/Web/Downloads/nu/al/FLUKE-1550C-1555_eng_manual.pdf (Section "Guard Terminal Use" on the 30th page, labelled page 12.)

It explains the use of the Guard terminal quite well.

[Dude McGee]

That brings me one step further, thanks! So, to my understanding, I would neither enhance accuracy nor safety when connecting a standard household cable's ground wire to G. I assume that the cable type shown in this chapter is something different than the cables you typically use in home environments.