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Test Equipment Anonymous (TEA) group therapy thread

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bd139:
FFS there's nothing wrong with it.  They're just shit or can't RTFM. It can't actually read low if they have done the job properly. Sounds like they haven't zeroed it or followed the shorting process properly.

I've done a temporary cal on mine and it's literally on the mark across the board down to 4 digits against my in cal U1241C. Still will drop it off at Calmet when I get 5 minutes.

I'd ask for your money back because it should have taken them way less time than it has to find that out.

mnementh:
IME, "too old" means "We don't have service/calibration documentation on your equipment, and we don't have anybody smart enough to figure it out themselves with enough actual engineering knowledge to service analog circuitry."  :-//

Good luck widdat.


mnem
I survived the morning working out in the Tejas suck. I need a medal or some damned thing. And a LOT of iced tea.

bd139:
Yep. Divs.

It's not even analogue to cal it. You just:

1. turn the switch
2. stick it in the range you want to cal
3. short it.
4. press the cal button
5. apply 1/3rd scale (not even required on all ranges)
6. adjust the display to the calibration voltage if you need to.
7. press cal.
8. goto 2.

Eventually when you've done them all it'll start up with SELF TEST OK  :-//

If it's reading low, it's basically a Y=MX+C transform where M and C are calibration variables. So someone put the wrong fucking M or C in.

When I did mine I did it with a PSU and connected the U1241 in series (current) or parallel (voltage) to it. Resistance I used some 1% resistors and frigged the display value to match the U1241's interpretation of the value. The linearity is amazingly good so was spot on when I cranked it up near FSD.

These are 100% works or doesn't work instruments.

Cerebus:

--- Quote from: bd139 on May 18, 2018, 04:50:17 pm ---These are 100% works or doesn't work instruments.

--- End quote ---

Not entirely. The resistance ranges can be knackered with the rest working fine. I don't know why, in principle there's nothing obviously wrong with the designs, but HP always had problems with the current sources on resistance ranges. If you've an HP34xx and everything's working perfectly except resistance then it's always the current sources. It's a stock fault for HP meters.

mnementh:
Sounds to me like they need to hire one of you guys to run their Cal lab.  :P

Of course, it's always possible they... no, I'm NOT gonna say it. Not gonna jinx a friend. ;)


mnem
 :-X

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