I have a soft spot for bright red meters and can't resist a good deal. I picked up the subject meter for like $20. Powers up fine, ohms readings are right against my standards but the DC measurements have a strange characteristic. If I place the leads on my 10v DC standard, the count will slowly increase to the approximate voltage. If I remove the leads and short them together, the reading will again drop slowly. If I select ohms or AC after reading DC, then select DC again, the count will immediately drop to zero. Given that the ohms readings are dead on against my .01% standards, I would think the ADC and associated circuitry is fine. It is almost like a cap is charging and discharging slowly when DC is selected. I guess there is something leaking in there but why would it drop slowly if that was the case?
Anyway, if someone has experience with the older Keithley172s or ideas, please post or contact offline. I have a number of restores ahead of this one unless it is something simple. Also, the idiot packed it poorly and the handle broke in shipment which disappoints me to no end. Almost as much as the other idiot who wrapped tape around the original box for an old HP DMM I bought. I don't know why people don't treat this old equipment with more respect no matter what the cost or how cheap.
Thanks,
Jerry