Re: [volt-nuts] Vibrating reed electrometers

The Keithley model 640 was a vibrating capacitor electrometer. It was available in the 1970's. Bruce > > On 04 March 2018 at 06:34 george wrote: > > Hi all > > To the best of my memory Keithley never made vibrating reed > electrometers, the only one that I

[volt-nuts] Vibrating reed electrometers

Hi all To the best of my memory Keithley never made vibrating reed electrometers, the only one that I am aware of is the Varian Cary 401 which did use Sapphire insulators. I was the European product line specialist for Varian Cary in the late 1960/1970 era and was involved with the 401.