joe smith | Testing Handheld Meter Clamp Circuits with 1KV DC @joesmith-je3tq | Uploaded May 2018 | Updated October 2024, 5 days ago.
This video is in response to a video created by Voltlog where he uses an insulation tester to attempt to stress a few handheld meters.
Just a quick update on the T6. I received this comment a while back:
"The other problem with the non-contact voltage measurement of the T6, is that it is referencing to earth. When ever I am fault finding in a panel, I am testing phase to phase or phase to neutral as that is the working circuit. Testing phase to earth is poor measuring technique, and is predominantly done when testing of absence of voltage, which the T6 is unsuitable for. "
It made no sense to me that the meter would not work using the non-contact mode when reference to something other than the earth ground. So I tried it on a few 3P circuits using a one phase for a reference and the non-contact on the others and as expected, saw no problem at all using it this way. Obviously you would have to have failed your studies if you were to touch the button and grab a live phase with your other hand. I am using the black reference probe when doing these tests.
I also had access to another Mitsubishi VFD that I tried it on. The VFD was running a motor. No matter what I tried, I could not get the T6 to read the voltage. This controller was running with a carrier at 5KHz. The VFD was reprogrammed to 15KHz and the T6 worked fine. We tried a few other lower frequencies and was unable to get the T6 to read.
All of the testing I had done up till now with VFDs was at higher frequencies. Leakage current may be a problem and I would assume many controllers will run low carriers. My guess is the T6's non-contact feature will have problems with this.
The Fluke T6, UNI-T UT90A, Kasuntest ZT102 and free meter from Harbor Freight are all looked at.
Voltlog's Video:
youtube.com/watch?v=pnv5qJoWIak&t=137s
This video is in response to a video created by Voltlog where he uses an insulation tester to attempt to stress a few handheld meters.
Just a quick update on the T6. I received this comment a while back:
"The other problem with the non-contact voltage measurement of the T6, is that it is referencing to earth. When ever I am fault finding in a panel, I am testing phase to phase or phase to neutral as that is the working circuit. Testing phase to earth is poor measuring technique, and is predominantly done when testing of absence of voltage, which the T6 is unsuitable for. "
It made no sense to me that the meter would not work using the non-contact mode when reference to something other than the earth ground. So I tried it on a few 3P circuits using a one phase for a reference and the non-contact on the others and as expected, saw no problem at all using it this way. Obviously you would have to have failed your studies if you were to touch the button and grab a live phase with your other hand. I am using the black reference probe when doing these tests.
I also had access to another Mitsubishi VFD that I tried it on. The VFD was running a motor. No matter what I tried, I could not get the T6 to read the voltage. This controller was running with a carrier at 5KHz. The VFD was reprogrammed to 15KHz and the T6 worked fine. We tried a few other lower frequencies and was unable to get the T6 to read.
All of the testing I had done up till now with VFDs was at higher frequencies. Leakage current may be a problem and I would assume many controllers will run low carriers. My guess is the T6's non-contact feature will have problems with this.
The Fluke T6, UNI-T UT90A, Kasuntest ZT102 and free meter from Harbor Freight are all looked at.
Voltlog's Video:
youtube.com/watch?v=pnv5qJoWIak&t=137s
