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Long story short we had our Keithley 6485 - (peeco ammeter*) repaired by Keithley and to prevent a future issue they suggested to build a diode voltage clamp to protect the meter.
The email recommends using a 2n3595 or MMBD1503 diodes as they are low leakage diodes. I haven't had such luck finding them (2N3595 doesn't exist) or they are SMD only.
I've found an old pdf from keithley out on the web building one:
https://doc.xdevs.com/doc/Keithley/Over ... tion22.pdf
and they recommended using 1n3595 diodes which are plentiful and cheap. Mouser doesn't say if they are low leakage or not. (see below)
http://www.mouser.com/ProductDetail/Fai ... y1m2LNsIzc
The 2 links below DO say they are low leakage, would they work for this application?
http://www.mouser.com/ProductDetail/Fai ... S3uKPjA%3d
http://www.mouser.com/ProductDetail/NXP ... porary-tag
Any help is appreciated!
**PS forum is censoring the word "Papa India Charlie Oscar" ammeter.....
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