A Portable Flutter-Measuring Instrument
A portable flutter-measuring equipment is described which may be used to measure the uniformity of motion of recording and reproducing machinery. The instrument filters out noise components, magnifies the frequency modulation, converts it to amplitude modulation, and finally demodulates it to obtain an indication of the frequency variation present in the original signal. — In flutter-correction work adjustments are made on the reproducer under the guidance of the measuring set. The cumulative effects of change of pressure or position of the guide shoes, alignment of sprockets or bearings, although individually small, are often considerable. To study flutter in recording machines 3000-cycle records are made, which are subsequently reproduced on known flutter-free machines and measured with the instrument.
- Print ISSN
- 0097-5834
- Published
- 1935-11
- Content type
- Original Research
- DOI
- 10.5594/J08743