Tektronix and Keithley

Hello all,

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!

Thanks

**PS forum is censoring the word "Papa India Charlie Oscar" ammeter.....

The diodes should be 1N3595. Not 2N3595.
These are low leakage fast reacting diode.
They should do the trick.

Perfect, thanks!