Products > Test Equipment
Fluke 8050A calibration
Fungus:
--- Quote from: bob91343 on July 30, 2020, 12:23:37 am ---Can someone point me to the resistor divider that makes the 200V and 20V ranges in the proper 10:1 ratio? If I find it I can trim the offending one and have what I want.
--- End quote ---
Look in the manual, it has all the schematics, etc:
http://manuals.chudov.com/Fluke-8050A.pdf
bob91343:
It appears that the ac ranges do not suffer the problem, just the dc. So maybe I would be better off leaving well enough alone.
A man with a watch knows what time it is. A man with two watches is never sure. A man with 20 or so voltmeters (me) scratches his head in confusion.
Anyway, while this unit has many nice features, it also has down sides. No autorange and no readout illumination. That's offset by the nice conductance ranges for very high resistances. I think it also calculates dB and some other stuff.
NoisyBoy:
I feel your pain with DMM alternative truth, it was bad.
I cured it by sending four bench meters back to Keysight each year for calibration. I calibrate the less precise bench meters and handheld DMMs myself with a Krohn-Hite calibrator, now the pain is gone and every meter agrees with each other :-)
You should at least get one of your meter through the NIST calibration so you know what the truth is. Perhaps the 3456A is a good candidate for it.
Fungus:
--- Quote from: bob91343 on July 30, 2020, 05:27:29 am ---It appears that the ac ranges do not suffer the problem, just the dc.
--- End quote ---
It's a different circuit. :-//
--- Quote from: bob91343 on July 30, 2020, 05:27:29 am ---So maybe I would be better off leaving well enough alone.
--- End quote ---
There's no way you can break anything*. Those things are designed for people to go in and twiddle manually - it's how they did it at the 8050A factory.
(and those people were working in a hurry...)
All you need is a stable voltage source that's somewhere near the top end of the range you're adjusting and a better meter for comparison. 8)
(*) Famous last words.
bob91343:
matiantech has convinced me not to meddle in this thing with a soldering iron. I will do the compromise tweak and stop agonizing. (yeah)
I also see some drift in readings for the first few minutes. I presume that's endemic to the unit.
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