| 摘要 |
A precision measurement voltage transducer is fed from a reference alternating current source and comprises a transformer and a servo amplifier. The transformer comprises a feedback winding, a magnetizing winding and an output winding. The feedback winding and the magnetizing winding together with the servo amplifier form a feedback control regulating system, which adjusts the input voltage of the servo amplifier to zero. The latter comprises two amplifiers, which according to a first embodiment are connected in series and which according to a second embodiment feed the two poles of the primary winding of a second transformer, the secondary winding of which forms the output of the servo amplifier. According to the first embodiment the second amplifier is provided with a positive and an equally strong negative feedback and according to the second embodiment the transfer ratio of the second transformer equals the amplification factor of the second amplifier.
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