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by lvcian
November 14th, 2019, 3:27 pm
Forum: Low Current Measurements
Topic: Old 640 vibrating capacitor electrometer
Replies: 10
Views: 34360

Re: Old 640 vibrating capacitor electrometer

Does anybody have a stock or leads on the Phillips xl7900 vibrating membrane capacitor that is at the heart of the keithley 640 ? I've recently acquired a 640 electrometer and find the dc-ac modulation technique fascinating and would like to acquire a few of the Phillips xl7900 for study and experim...

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