Method of and means for measuring the level of test signals over

Details Method of and means for measuring the level of test signals over Method of and means for measuring the level of test signals over

1977-07-08

1979-05-22

Rolinec, Rudolph V.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Analysis of complex waves

324 79R, 324128, G01R 1922, G01R 2314, G01R 120

Patent

active

041561830

ABSTRACT:
To measure the level of test signals over a frequency range of variable bandwidth B, bounded by a lower frequency f' and an upper frequency f", these signals are heterodyned with a variable modulating frequency to produce a frequency spectrum encompassing the pass band of an intermediate-frequency filter of fixed bandwidth b.ltoreq.B, centered on a frequency f.sub.c. By periodically shifting the modulating frequency between a minimum value of f'-f.sub.c +(b/2) and a maximum value of f"-f.sub.c -(b/2), either continuously or in steps, the frequency range of bandwidth B is scanned by a window of bandwidth b transposed to the pass band of the filter as the midfrequency f.sub.m of the window varies in a sweep cycle between f'+b/2 and f"-b/2. The signal level in the output of the filter, integrated over the sweep cycle, is weighted with a corrective factor B/b.

REFERENCES:
patent: 2899639 (1959-08-01), Shepherd
patent: 3303422 (1967-02-01), Lucius

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