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New UNI-T UT892 2000V AC/DC High Voltage Multimeter
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PartialDischarge:
So I repeated the test with the resistors at the PTC shorted and it did arc at about 4.8kV. I did repeat the test 3 times after that, and each time the arcing voltage became lower, which is expected as what usually happens is that a carbon conductive layer forms and the HV already knows where to go to the next time.

Also the humidity plays a role here, it is very dry here but in the winter or near the sea the result would have been probably 20%..30% lower.
So as I expected having an initial resistance near the input port increases the overall arcing/corona resilience.

Fungus:

--- Quote from: PartialDischarge on September 10, 2022, 07:38:43 pm ---So I repeated the test with the resistors at the PTC shorted and it did arc at about 4.8kV. I did repeat the test 3 times after that, and each time the arcing voltage became lower, which is expected

--- End quote ---

Cool!  :-+

Can you do it with the lid off and see where it arcs?
Mechatrommer:

--- Quote from: Fungus on September 10, 2022, 08:39:00 pm ---Cool!  :-+
Can you do it with the lid off and see where it arcs?

--- End quote ---
yeah and then send back report to uni-t on where they should change the layout, but i think the carbon should already visible by now ymmv. its fun and tempting to some people to stress test an instrument beyond its rated operation just to find out which brand has more "air" inside ;D
PartialDischarge:

--- Quote from: Fungus on September 10, 2022, 08:39:00 pm ---Can you do it with the lid off and see where it arcs?

--- End quote ---

Not really, I'd have to solder the 9V battery terminals that are on the back cover, and do the test in the dark. This Hipotronics is designed to test, not to burn or destroy so the arcing is probably going to be very dim. Also it could also happen on the back side of the board since that PTC is through hole.

Also this test was for AC but for DC which is what mostly everyone will use this meter for, the threshold is going to be much higher.
joeqsmith:
Why does the battery need to be inserted? 


--- Quote from: Mechatrommer on September 10, 2022, 10:27:00 pm ---... i think the carbon should already visible by now ...

--- End quote ---

Certainly worth having a look.   
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