Electronics > Repair

HP 6177C DC Current Source Repair and Restoration (COMPLETE)

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coppercone2:
nice this mod actually works, I can set it to the closest 100nA pretty easily. I think the pot needs replacing but it does work on 250uA for 81 model  :-+

I see the meter misbehave when I adjust it on all ranges. There is a bit of noise too, I need to do test with coaxial cable, closed enclosure, cleaned PCB (its totally dirty because I am waiting for more resistors and caps to replace everything) and replaced potentiometer.

coppercone2:
Hmm I replaced all but 3 of the carbon resistors, and all the electrolytics. Now it looks like the adjustment of the potentiometer is smooth. Maybe its fine and the problem was elsewhere.  ???

motocoder:

--- Quote from: coppercone2 on October 18, 2024, 06:16:45 pm ---nice this mod actually works, I can set it to the closest 100nA pretty easily. I think the pot needs replacing but it does work on 250uA for 81 model

--- End quote ---

Glad it works for you.

coppercone2:
yeah I am waiting for a metal foil to replace the 1/4 watt rando resistor I put in there

coppercone2:
totally silent after I replaced the 3 50nF disks with 50nF foils on the rectifier PCB  :)

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