Typical analysis of the constant-current resistance and the output current error, The writer gives the analysing process by means of operational amplifier.

从恒流源内阻和形成输出电流误差两个方面，给出用运算放大器构成压控恒流源的分析结果。

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The operational performance of DC bridge circuits(including constant voltage and constant current) was analyzed.

对直流（包括恒压和恒流）电桥的工作性能进行了分析。

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The composition and operational principle of an automatic frequency con version constant pressure water supplying system based on PLC and frequency convertor with serial communication are introduced.

介绍了一种基于PLC和变频器采用串行总线方式通讯的变频恒压供水系统的构成和工作原理。

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In Cardiff, middle managers suffer constant destabilising change, posts sit unfilled for months on end and operational managers have no control over their budgets.

ECONOMIST: The pay is better than it was. The bureaucracy is worse