FLUITER_METER

Published:2009/6/30 2:25:00 Author:May | From:SeekIC

Signetics 561N PLL detects frequency variations in 3-kHz tone recorded on magnetic tape for test purposes. Frequency of VCO in 561N is set to nominal 3kHz with 5K pot.Demodulated output is AC coupled to amplffier having high input impedance. Either CRO or true PMS voltmeter can be used to make RMS flutter readings. To calibrate circuit, feed in 3-kHz tone from oscillator and measure output level shift when frequency is offset 1%.- Sig-netics Analog Data Manual, Signetics, Sunnyvale, CA 1977, p 860.



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