Keithley 2002 repair help

[WastelandTek]

looks like it is settling down nicely

[nikonoid]

I finally have an automated logging going. Here are first few logs recorded for the newly repaired meter, covering warm up performance from completely cold.

In general it looks like it takes about 1 hour for readings to be very close to stable and 2 hours to completely stabilize.

10V log will be coming next.

[TiN]

Sounds right to me. I would try my units, but I has no available GPIB dongles, it's all busy at 3458s doing measurements.
When I need to use meter, I power on them to warmup 24 hours ahead. You can watch internal temperature to calibrator sensor reading (TEMP function - Internal sensor).

[nikonoid]

Thanks, TiN.

I also measured 10V produced by 732A for warm up (3 hours) and also 14 hours run after 24 hours warm up.  I am happy with 3 hours warm up performance. Calibration manual suggests 4.
 
Voltage variation withing 14 hours run is definitely better than 24 hours spec and somewhat withing ballpark of transfer spec. I may need a tighter clamp on environmental noise before judging transfer specs.

I do not yet have temperature logging synchronized with voltage, but temperature variations were about +/- .5 degrees C during the run.

Are these consistent with what I should be expecting?

[TiN]

Yes, all good, 0.3ppm pk-pk, well within expected normal.

[nikonoid]

Thank you, TiN. Time to move on to new projects...


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[TiN]

Need a calibrator? 

[nikonoid]

What calibrator?


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[Samogon]

I think he meant, for Your next project and it should be fluke 7500 or Datron 4808

[nikonoid]

5700a and 4808? These are a tad too expensive. I almost bought 4708 few months back.

I have K2001, K6517, K237 and K2601 on my to do list...


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[branadic]

The softkey pad on our K2002 was nonfunctioning. I found the conductive elements of the softkey pad completely worn out, no conductivity at all. Curious enough, Keithley has originally tinned the corresponding contacts on the PCB with HASL, which is weird, they should be gold plated, shouldn't they? I'm confident it is original, as all vias are tinned too.
I today received a CW2605 repair kit made by CHEMTRONICS.

https://de.farnell.com/chemtronics/cw2605/repair-kit-elektr-leitend-1x3gr/dp/128790?ICID=I-RP-STM7REC-0

However, the process was easy and the material is already drying until monday, as they say it's dry within 24 h at room temperature and fully usable after 72 h.
I felt I should share the experience in case someone else has the very same issue.

-branadic-