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| 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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