Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-09-13
1978-05-16
Krawczewicz, Stanley T.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 78Z, 324 79R, 324 82, 328134, 328141, 328148, 328163, G01R 2700
Patent
active
040901262
ABSTRACT:
A frequency marker generator for providing marker pulses corresponding to known frequencies over a wide band of frequencies is disclosed. A signal having a predetermined frequency or known frequency as well as the output unknown frequency or frequencies of the signals from a system under test are both applied to a phase and frequency detector. A sweep generator provides a signal which is variable in frequency over the frequency band of interest, and is applied to the system under test. The phase and frequency detector having two discrete output states provides a transition of its output state when the variable frequency output signal from the system under test passes the predetermined frequency and a differentiator differentiates the output signal from the phase and frequency detector and transmits it through a pair of steering diodes to provide a frequency marker signal which may be recorded separately or mixed in a mixer with the output of the system under test to provide a display of the amplitude versus frequency of the system under test at the predetermined frequency or frequencies.
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Laird Andrew K.
Poticha Charles
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