Products > Test Equipment

Keithley 6485/6487 teardown

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plesa:
I found on my cell phone few internal photos of Keithley 6487.
It is quite similar to the 6485 ( without +/- 500V voltage source - bottom board and second transformer).
The front end contains LMC662, LMC6081. Voltage reference is LM399H.
Sorry for poor quality.

razberik:
Hello, do you remember please whether those white EE2 relays are for range switching ?
Thank you

plesa:

--- Quote from: razberik on January 13, 2017, 09:09:27 am ---Hello, do you remember please whether those white EE2 relays are for range switching ?
Thank you

--- End quote ---

Yes, based on clicking it is used for range switching. And electrometers 6514 and 6517 are using similar relays to Meder HI series.

razberik:
These HI Meder looks good. It is comfortable to deal with Meder ... in my native language, they manufacture some series in Prague.

Today I got a good chance to do some brief teardown. I attach pics.
It surprise me that they dont use better relays, but literally jelly-bean relays. :o

razberik:
Today I was given a task to test resistivity of some materials. I was climbing with voltage from few volts to few hundreds of volts. Then suddenly relays started to clicking and OV.RFLOW:A showed on display. Totally bricked. Changing ranges does nothing.
Exactly the same behavior like this:
https://forum.tek.com/viewtopic.php?f=41&t=103860

Any tip what to do ?

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