SU1396063A1 - Electric meter - Google Patents

Abstract

The invention relates to a measurement technique and can be used in measuring the potentials of electrophotographic layers. The electrometer contains a probe 1, an amplifier 3, a detector 4, a compensating voltage source, made in the form of a generator 8 of varying voltage, a voltmeter 7, a vibrator 2, a comparator 5, a one-shot 6 exciter 9. The measurement accuracy improves. 1 il.

Description

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This invention relates to electrical measuring technology and can be used for measuring potentials of electrophotographic layers.

The aim of the invention is to improve the accuracy.

The drawing shows the scheme: electrometer.

The electrometer consists of a sensor with a probe 1 and a vibrator 2,

silica gel 3, detector 4, comparator 5, one-shot 6, voltmeter 7 for example, digital) 5 generator 8 Variable voltage: none and excitable 9.

The electrometer operates as follows.

The vibrator 2, excited by the driver 9, oscillates the probe 1, found

Near the charged surface 10. On probe 1, a 1 {1 alternating voltage is produced, proportional to the potential difference between the charged surface 10 and the probe

. The potential of probe 1 is set by the I-TopToM 8 alternating voltage, which produces a voltage, varying within the measuring range, of arbitrary shape, with a frequency much less than the frequency of the vibrator 2. The signal produced by the probe 1 is amplified by amplifier 3, detected by detector 4 and fed to comparator 5, which generates a signal in the absence of voltage on the detector, which occurs when the potentials of the probe are equal to the charged surface. The signal from comparator 5 is fed to a one-shot 6, which starts a voltmeter 7, measuring the voltage on the alternating voltage generator at this moment.

Claims (1)

Claims. An electrometer comprising a probe, an amplifier and a detector connected in series, a compensating voltage source, the output of which is connected to a voltmeter and a probe input, and a vibrator, characterized in that, in order to improve accuracy, the compensating voltage source is made in the form of the generator is changing state voltage, while the detector is connected in series with a comparator and a single battery whose output is connected to a voltmeter ..