必须谨慎选择绝缘方法和使用保护电位，必须使用输入偏置电流为微微安级的放大器。
You must carefully choose insulation and apply guarding potentials, and you must use an amplifier with picoampere input-bias currents.
介绍了由数控电位器、仪表放大器以及单片机构成的激光焊监测系统信号处理电路的工作原理及实用电路。
The principle and circuit of monitoring system in laser welding are introduced in this article, which consist of numeric control potentiometer, instrumentation amplifier and SCP for data processing.
根据安培检测和恒电位器原理，利用数据放大器采集放大微弱信号，研制了一种新型微安培检测器。
A new micro-ampere detector, which USES the data amplifier to enlarge the weak signal, is developed according to the principle of the ampere detection and the potentiostat.
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