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Author Topic: Looking for 3M 701 Megaohmeter schematic  (Read 440 times)
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OscarH
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« on: November 01, 2015, 07:14:10 19:14 »

Hi Guys,
Does one of you have a 3M 701 Megaohmeter schematic available ?
Mine is no longer working in 'surface test' on the +10V position above 1 Gohm. +100 V is working well.
Not critical, just a good experience in troubleshooting a device at very low current measurement...
Thanks,
OscarH
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egstudio
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« Reply #1 on: December 09, 2015, 05:51:58 05:51 »

In attachment the "verification and calibration manual". With that You can repair  this instrument (99,9 %, due to his simple circuit )..
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OscarH
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« Reply #2 on: December 09, 2015, 06:44:24 18:44 »

Thanks Egstudio.

Apparently I am unluckily in the 0.1%. Sad By the way, I found 701 was out of specs in using the calibration manual.

I went trought some diagnostics, but without the schematic it is not so easy...
According to failure symptoms, it looks like a component (capacitor ?) has a leakage as failure is really for low currents measurement.
I'll give it another try when time permit.

OscarH
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