Current‐to‐voltage amplifier with a high voltage isolated input
Current‐to‐voltage amplifier with a high voltage isolated input
复制标题
具有高压隔离输入的电流电压放大器
DOI：
--
复制
发表时间：
1989
期刊：
影响因子：
--
通讯作者：
C. M. Kahla
中科院分区：
文献类型：
--
作者：
B. Jaduszliwer;C. M. Kahla
由于商用静电计的输入通常只能浮在几十伏的电压上，因此测量在高压下电极上收集的极低电流是一个经常遇到的实验问题。当我们试图测量铯束原子钟上使用的电子倍增器的第一节增益时，我们遇到了这个问题。为了解决这个问题，我们设计、制造并测试了一个电流-电压（跨阻）放大器，其输入可以浮动到±2000 V，同时提供一个接地参考低阻抗输出，能够驱动电压表或图表记录仪。这种非常灵活的仪器可以测量10 - 12 -10 - 7 - A范围内的电流，具有1 Hz的带宽，并且可以以几百美元的成本构建。
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.