| Electronics > Repair |
| Keithley 2002 repair help |
| << < (41/43) > >> |
| 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. |
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