Electronics > Repair
Keithley 2002 repair help
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TiN:
2001/2002 are not friendly for hobby level calibration, meaning that you must run ALL calibration steps without error to allow it to store data into NVM (which is pair of 24C16 EEPROMs in case of 2002).  :-DMM

Also since you had unit repaired and also it's an old one, you must run low-level manufacturing calibration, otherwise your current, resistance and AC functions will not work/calibrate correctly. For this you need Fluke 5700A/5720A or Wavetek 4808 (due to 200V 30kHz requirement) + HP 3325/3245/similar signal generator for 2V 1Hz AC. I think I have the footage recorded of both 2001 and 2002 cal procedures run, will need to find it and upload to YT, if you interested.  :bullshit:

Then user-calibration or point cal adjustment can be ran to tweak ranges/functions. They still run in groups, so you cannot calibrate single range in traditional manner. GPIB control is required for easy calibration process and advanced error reporting.  :P

There are few "self-calibration" steps during which meter measure internal signal path sections, comparing to externally measured references, and if any of them failed for whatever reason (gain error or offset error) than meter will throw whole calibration data away and you must start over from the beginnig. It took me a while to sort all this stuff out, and it's definately not an "few hour playjob with access to friend's calibrator" sorta thing.  :popcorn:
Le_Bassiste:

--- Quote from: nikonoid on July 18, 2017, 03:29:05 am ---
For decontamination I am considering a large ultrasonic bath with distilled water and IPA. Or possibly using syringe to power wash it. 

Suggestions and condolences are welcome (;

Sent from my iPhone using Tapatalk

--- End quote ---

no condolence but congrats, nice find!
as for the suggestions: clarify first with component manufacturers as to whether the ultrasonic can harm any components. if in slightest doubt, don't use ultrasonic. just, don't.
also, the shroud over the analog board (or, to be more precise  ;) , the absence of it) will really bite you when trying to debug the analog section (fingers crossed that you don't have to do that) , as it is ultra sensitive to any temperature fluctuations across the board.


...my 0.02.
Dr. Frank:

--- Quote from: nikonoid on July 18, 2017, 03:29:05 am ---
..
For decontamination I am considering a large ultrasonic bath with distilled water and IPA. Or possibly using syringe to power wash it. 

Suggestions and condolences are welcome (;


--- End quote ---

Suggestion: Never use ultrasonic bath on assembled PCB.
This will probably kill many/most of the semiconductors.

Frank
WastelandTek:
OK, I am subbing to this thread

this is getting really interesting
Samogon:
Probably it depends on what ultra sonic cleaner to use. Crest for instance is proved to be good for Mac motherboards and cell phone pcb cleaning.
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