A tuned detector-amplifier for power-frequency measurements
W K Clothier; W E Smith; W K Clothier; Commonwealth Scientific and Industrial Research Organization, National Standards Laboratory, Chippendale, New South Wales, Australia; W E Smith; Commonwealth Scientific and Industrial Research Organization, National Standards Laboratory, Chippendale, New South Wales, Australia
Журнал:
Journal of Scientific Instruments
Дата:
1955-02-01
Аннотация:
A tuned detector-amplifier for power frequencies (20-60 c/s) is described. It can detect ¼ μV in a 1 MΩ resistance source and when used with suitable tuned input transformers, its power sensitivity is 10<sup>-19</sup> W. The amplifier is tuned by means of a two-section inductance-capacitance filter, the inductors of which are varied simultaneously by a direct current in control windings on their Mumetal cores.
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