Abstract
A synchronous detector based on the polarity coincidence principle is described that permits the use of very long integration times. The theory of operation is discussed with special emphasis on the influence of correlations between samples and the influence of error sources. Details of the construction are presented and test results are discussed. The present instrument works in the range of 20 cps to 20 kc and is capable of measuring amplitude signal-to-noise ratios as low as 10−4. It has been in constant laboratory use for more than a year and has proven to be a very reliable tool for the synchronous measurement of small ac signals.
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