Automatic zeroing electrometer

Details Automatic zeroing electrometer Automatic zeroing electrometer

G - Physics

01

R

324/47

G01R 29/12 (2006.01) G01R 29/24 (2006.01)

Patent

CA 1040267

AUTOMATIC ZEROING ELECTROMETER ABSTRACT OF THE DISCLOSURE An electrometer system particularly adapted for non-contact measurement of electrostatic charges in electro- statography, such as the charge level on photoreceptor sur- face areas in xerographic machines. The electrometer circuit has a very high impedance normally floating input, and a simple D.C. measurement circuit. The measurement circuit output can be read by a conventional test meter. The electrometer is controlled by a simple switching arrangement providing an automatic zeroing position in which the initial level of the input circuit is automatically reset by a feed- back amplifier from the output to compensate for any temper- ature induced or other variations in the measurement circuit. The power supply voltage is automatically monitored and the output meter is driven to a non-zeroing position in response to a low supply voltage.

239710

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