Abstract
The measurement of very low currents collected on electrodes held at high voltages is a commonly encountered experimental problem, since a commercial electrometer’s input can usually be floated only at a few tens of volts. We have run into this problem when attempting to measure the gain of the first dynode of an electron multiplier of the type used on cesium-beam atomic clocks. In order to solve it, we have designed, built, and tested a current-to-voltage (transresistance) amplifier whose input can be floated up to ±2000 V, while providing a ground-referenced low-impedance output capable of driving a voltmeter or chart recorder. This very flexible instrument can measure currents in the 10−12 –10−7-A range, has a 1-Hz bandwidth, and it can be built at a cost of a few hundred dollars.
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