Agilent 1953-11 free download

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HEWLETT-PACKARD JOURNAL TECHNICAL INFORMATION FROM THE -hp- LABORATORIES Vol. 5 No. 3-4 1LISHED BY THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA NOV.-DEC, 1953 A New 60 -Cycle Per Revolution Generator for Precision Tachometry Measurements '"T~1HE new -hp- Model 5 08 A Tachometer in one of its major applications: quick pro _L Generator is designed to be used with duction-line checking of slip in electric mo the -hp- Model 522 Electronic Counter to tors. The generator output terminal is con make rapid, high-precision measurements nected to the 522 counter, which is set for a of rotary speeds. For each revolution of its 1 -second frequency measurement1. The gen driving shaft, the generator provides 60 erator shaft is connected to the shaft of the cycles of output voltage. This speed multi production motor, either directly or through plication feature enables a test load or similar arrangement. The SEE ALSO: "Time-Frequency the combination of counter then automatically displays in digi Transform Table" on inside pages counter and generator to tal form the rpm of the motor. A panel con make in 1 second preci- trol on the counter allows the operator to sion tachometry measurements that are di select the length of time that the counter rect-reading in revolutions per minute. The displays its measurement. At the end of this speed and accuracy obtainable with the gen time the counter automatically repeats its erator and counter also make them valuable measurement which requires 1 second. Meas for a number of other studies of mechanical urements can thus be made as often as de motion besides simple measurements of rpm. sired. Fig. 2 indicates how the generator is used Rpm measurements made with the gener ator and counter are made to a high order of accuracy: within ±1 rpm2. If higher accu