Products > Test Equipment
Keithley 2400 SourceMeter review and teardown
plesa:
I will take picture with infrared camera, this was helpful during my repair.
If you cannot find bad transistor, desolder transistors and test them within operating conditions.
Firmware recommended is C32, C33 has delay to work properly at 90V in mains :) I needs to downgrade, the startup delay was annoying.
BTW is anyone interested in purchasing new VFD DD-51 for Keithley gear, send me PM.
z01z:
Yes, that startup delay is very annoying, I also went back to C32 because of that. It should be made selectable somehow.
plesa:
Christmass for Keithley gear :-/O
plesa:
Time to replace few VFD on various Keithley gear. New VFD are little bit smaller with contacts in one line.
VFD holds on PCB 3M VHB double side tape ( reel 33m/150 EUR).
Contacts are soft and easy to bend. By tweezers I select pins row and later align all in two rows by PCB.
After that started from one side and with tweezers I put each pin into hole by tweezers.
After two hours is repair of K2400 finished ( forgot to connect analog board - Over temperature )
ivonenand:
Hi guys,
Does anyone know, how the output current sense is implemented in this SMU (or any other for that matter)? The thing is, you need extremely high CMRR, since the output is anywhere in the +-200V range. Second, the SMU offers better than 1uA resolution, so there must be little or no leakage on the amplifier connected to the output shunt. You cannot do that with a standard differential amplifier.
Any ideas on how the amplifier connected to the output shunt is implemented?
Regards,
Ivo
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