Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1996-04-24
1998-02-03
Brown, Glenn W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 7641, 324 7644, G01R 2314
Patent
active
057148767
ABSTRACT:
An in-service cable length and source signal level measurement system uses a simple, zero-IF superheterodyne receiver tuned to only two reference frequencies to generate samples of a serial digital signal at each of the two frequencies. The samples at the two frequencies are input to a processor that calculates the cable length and source signal level as a function of the samples so obtained and cable dependent constants. The samples in units of decibels are subtracted to obtain a loss differential between the samples at the two reference frequencies, and then scaled by a cable dependent scale factor to obtain the length of the cable independent of source signal level and temperature. The source signal level is extrapolated from the loss differential and one of the samples based upon a nominal source amplitude and the cable dependent constants.
REFERENCES:
patent: 4135243 (1979-01-01), Peregrino et al.
patent: 4504786 (1985-03-01), Slaughter
patent: 4568878 (1986-02-01), Bales
patent: 5019823 (1991-05-01), Bream et al.
Brown Glenn W.
Gray Francis I.
Tektronix Inc.
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