Apparatus for testing the linearity of a frequency modulated osc

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage

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324 79D, 331 44, 332 20, G01R 2315

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active

043994083

ABSTRACT:
An APC (automatic phase control) circuit is utilized to measure the linearity of an FMO (frequency modulated oscillator). In accordance with a common APC concept a programmable divider is connected to an output of said frequency modulatable oscillator to produce a binary output signal having a predetermined pulse repetition rate. This signal is compared with a reference oscillator signal in a phase control comparator producing a DC control signal which is applied to the control input of said frequency modulated oscillator to maintain the average oscillator frequency constant. This DC control voltage gives an indication of average free running frequency of the oscillator.
To measure linearity, the said binary signal at the programmable divider output is also further divided and processed to produce a low frequency square waveform which is applied via a manual ON/OFF switch and a modulation amplifier to the modulation input of the said FMO. The change in the average free running frequency of the FMO, and the corresponding change in the DC control voltage resulting from alternatively switching the low frequency waveform ON and OFF, is a measure of the FMO's linearity. This change is amplified and a zero center meter is employed to indicate the magnitude and sign of the error, and to permit adjustment to obtain a minimum error indication.

REFERENCES:
patent: 3512089 (1970-05-01), Cushman
patent: 3549997 (1970-12-01), Rotzel
patent: 3571760 (1971-03-01), Schwartz et al.
patent: 4122391 (1978-10-01), Harp et al.

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