In this episode Shahriar describes the operation of the vintage HP frequency meter devices. These instruments were designed in the mid-1960's and offer extremely good performance. The principle operation is based on a quarter-wave tuned cavity which is mechanically adjusted with high precision. The cavity is coupled to the through line which causes a dip of about 1.5dB at resonance.
The internal structure and design challenges are presented. A frequency meter is then used to measure a single tone and two-tone signal with impressive accuracy. The scaler transmission response of the frequency meter is also presented.
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