Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1975-08-11
1976-07-06
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 83R, G01R 2700
Patent
active
039684270
ABSTRACT:
A network analyzer which compares a reference signal supplied to a device under test with an output signal from the device under test is used to measure the group delay caused by the device under test. The reference signal is produced by a swept frequency signal generator. During the sweep of the signal generator the difference between the instantaneous frequencies of the reference signal and the output signal from the device under test is determined as is the rate of change of the frequency of the reference signal. The instantaneous frequency difference is divided by the rate of change of the reference frequency to produce an instantaneous indication of the group delay produced by the device under test.
REFERENCES:
patent: 3384818 (1968-05-01), Longerich et al.
patent: 3445762 (1969-05-01), Wu
Barrett Patrick J.
Hewlett--Packard Company
Krawczewicz Stanley T.
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