| 摘要 |
Apparatus for measuring the root mean square of a signal by applying the signal across a resistance which is the input to an amplifier and controlling the resistance so that a constant level of current will always flow into a multiplier. The average output from the multiplier is compared with a fixed reference, and any error therebetween is effective through servo control mechanisms to vary the input resistance as necessary to reduce the error to zero. The input resistance is coupled to an output resistance and the value of the output resistance will be proportional to the voltage of the signal being measured.
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