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New UNI-T UT892 2000V AC/DC High Voltage Multimeter

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NoMoreMagicSmoke:

--- Quote from: Gyro on September 06, 2022, 09:39:38 pm ---I won't get on to my pet gripe about the 10Meg input resistance cop-out on DMMs then.  :D

--- End quote ---

I mean this sounds like a good read regardless!!!

floobydust:
Obviously never been a member of the 20,000 ohms/volt club  :-DD
A multimeter for electricians should be in the other direction... LowZ. But not on the 2kV range.
Once I got burned with a multimeter 22MEG input resistance, measuring good mains voltage- yet the fuse was blown. It was dirt/CNC coolant on the fuseholder giving enough leakage current for the bogus reading. Costly mistake.

PartialDischarge:
Just received the UT892, had only 15 minutes to play with it, here are some observations:

- It only displays up to 2200V then it shows OL
- From 1900V display turns red and beeps.
- 20Meg string is made up of 8 2.5Meg resistors, not shared with 10Meg input. At 2000V thats 0.025W per resistor.
- Although string is mounted at the board side edge, there is good creepage to the outside thru the enclosure lip. The first resistor in the string (R29) should have been placed earlier. Still the whole string can be covered by silicone-.
- Mine is reading 0.2% below at 1000/2000V scale, so very good
- Continuity mode works nice, is fast
- Display contrast is ok, does not have the low contrast problem.

Gyro:
Thanks for being the first to bite the bullet. :-+

An interesting meter (or manufacturere function combination choice). Thoughts that come to mind...

- As you say, they would have been better to put the 2kV chain further inboard.
- I was assuming that they would have added some more resistance in series with the main chain rather than having a separate one. Maybe they didn't want 1kV appearing on the main input jack?
- Funny that they have only 8 resistors in the 2kV chain versus 10 in the main one - that's 275V per (1206?) resistor at full 2200 count!
- I wonder what the voltage rating of that PTC is- although they have excluded the 2kV jack from the cat rating.
- It's amusing that the display goes red at 1900V... Because that's where things get interesting, right?  :D

Thanks for the first look!


P.S. I wonder if they have done anything different with the switch contact spacing?



Fungus:

--- Quote from: Gyro on September 08, 2022, 04:55:22 pm ---- As you say, they would have been better to put the 2kV chain further inboard.

--- End quote ---

Very obvious and would have cost them absolutely nothing to do it. I wonder what else they overlooked?  :scared:


--- Quote from: Gyro on September 08, 2022, 04:55:22 pm ---- I wonder what the voltage rating of that PTC is- although they have excluded the 2kV jack from the cat rating.

--- End quote ---

How many volts would you need to apply to heat up a PTC in series with a 20MOhm resistor?

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