Products > Test Equipment

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

<< < (6/19) > >>

joeqsmith:

--- Quote from: PartialDischarge on August 28, 2022, 07:04:56 pm ---
--- Quote from: joeqsmith on August 28, 2022, 06:59:03 pm ---
--- Quote from: floobydust on August 28, 2022, 06:50:54 pm ---Who would trust Uni-T for safety or minimal honesty?
...  Have to see a teardown and BBQ lighter test lol.

--- End quote ---

We could get one and treat it as a special case, cause it's a special meter.  Maybe just test the 2kV input only.   I ran one of their high voltage sticks.  It died fairly early on as well. 


--- End quote ---

I’ll do that when it arrives with my Hipotronics HD140

--- End quote ---
I remember a few people using low current leakage testers to look at meters.   Even Dave did something similar.  Of course, they can provide enough current to prevent them from folding back.  Consider making a video of it when you run it.  I would like to watch.   Attached is a video I made to show a few cheap meters on my larger 1kVDC supply.   It appears the HD140 has a Max Trip Current AC Test 5 mA.  By comparison  I've taken out the small half amp HRC fuses with this this supply by accident.   This is the same supply I used to demonstrate to Dave that it is indeed possible to damage a DMM at 1kV after he had suggested otherwise (also attached).     


--- Quote from: floobydust on August 28, 2022, 07:05:03 pm ---The UT892 manual says
"... withstand surge voltage up to 1000V..."
"Do not measure ACV/DCV voltage over 1000Vrms. It is possible to measure higher voltage but it may cause damage to the meter or user!"

so I'm assuming the usual functions have no decent input protection. That costs many pennies and the boss still wants a new Lambo  :-DD

--- End quote ---

??  So it's rated for 2kV but only use it to half the rated or you can damage it?      :-DD





floobydust:

--- Quote from: joeqsmith on August 28, 2022, 07:27:19 pm ---
--- Quote from: floobydust on August 28, 2022, 07:05:03 pm ---The UT892 manual says
"... withstand surge voltage up to 1000V..."
"Do not measure ACV/DCV voltage over 1000Vrms. It is possible to measure higher voltage but it may cause damage to the meter or user!"

so I'm assuming the usual functions have no decent input protection. That costs many pennies and the boss still wants a new Lambo  :-DD

--- End quote ---

??  So it's rated for 2kV but only use it to half the rated or you can damage it?      :-DD

--- End quote ---

It appears to be a normal (Uni-T) multimeter with the 'strong as bamboo' input protection, and the manual seems to refer to this - good for 1,000V typically... despite the Cat. III 600V rating which is a 6kV impulse...
The extra 2,000V input there are no specs for it. I assume it's just another 10MEG resistor array in series with the main divider string.
With no approvals and the owner's manual jibberish, who knows what voltage this thing can safely do before arcing internally.

joeqsmith:
I couldn't tell you anything about safety but could determine at what level it is damaged.   

Kleinstein:
Without a current range the safety may be a little better than with many other cheap meters.  No need to worry about a HRC fuses.
The separate 2000 V input has a good chance to also give better protection for the ohms circuitry. So at least that input can be relatively robust, not going to the switch for the ohms part.

I would not use it for higher mains voltage or CAT3 use, but it could still be a good meter for the few cases where you have 1000-2000 V with a limited current, like for PMT tubes or similar. Still 2000 V is only a rathersmall step up. The usual probe wires are typically only made with 1000V in mind. So to be on the safe side one would also need special test probes (at least 1).

jhoffman:

--- Quote ---Without a current range the safety may be a little better than with many other cheap meters.  No need to worry about a HRC fuses.
--- End quote ---

Less chance of a "high energy electrical explosion" (4th July Fireworks!!!) by accidentally connecting a multimeter in "current mode" to a HV power rail.

Removing "current mode" is a valid "safety feature".

Great point !!!

Replace the test leads with 8000 Series Probe Master Test leads and it might become a half decent HV VOLTMETER (I deliberately avoid the word multimeter).

Another point is that this UNI-T UT892 meter comes with a substantial rubber holster (for a $32 USD meter) so there's quite a bit of electrical insulation.

Given that there's no current mode and lots of insulation (just replace the test leads) this meter is beginning to appear as a viable HV VOLTMETER.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod