Products > Test Equipment
New UNI-T UT892 2000V AC/DC High Voltage Multimeter
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PartialDischarge:
So here are some more tests

For the 1000V input, AC test up to 2kVrms, there is a limiting device that trips at around 1.9kVrms:



For the 2000V input, AC test up to 4kVrms, no problems, although this is with the 760k resistor up front instead of the original  PTC:
 



For the 2000V input, AC test up to 5kVrms, no problem, current meter reads 250uA as expected, I don't really see the point in going further, 5kVrms is 7kV peak.



joeqsmith:
Thanks for taking the time to make these clips.  Would you consider getting a second meter to repeat the tests without the mods?  May be interesting to see you sweep the voltage as well.   
PartialDischarge:

--- Quote from: joeqsmith on September 10, 2022, 02:43:22 pm ---Thanks for taking the time to make these clips.  Would you consider getting a second meter to repeat the tests without the mods?  May be interesting to see you sweep the voltage as well.

--- End quote ---

I don't just need another one cause this one is fine and I'm going to use it, but I can short the PTC and test again, that'll be easier.
joeqsmith:
No concerns about the unknown resistors?
PartialDischarge:

--- Quote from: joeqsmith on September 10, 2022, 05:25:12 pm ---No concerns about the unknown resistors?

--- End quote ---
I'm more concerned about a 2 inch trace running in the PCB from the input. Resistors if they are bad they will change their properties a lot but they are not going to suddenly short to 0.
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