Agilent 1953-09 free download

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HEWLETT-PACKARD JOURNAL T E C H N I C A L I N F O R M A T I O N F R O M T H E - h p - L A B O R A T O R I E S Vol. 5 No. 1-2 UBLISHED 1953 THE HEWLETT-PACKARD COMPANY, 395 PAGE MILL ROAD, PALO ALTO, CALIFORNIA SEPT. -OCT., 1953 Time Interval Measurements with the -hp- Electronic Counter >"T~1HE recently-introduced -hp- Model Viscosity JL 522B Electronic Counter1 measures such Timing of many kinds of high-speed quantities as frequency, period, total events, mechanical motion and frequency ratio. Of special interest, how For measuring time intervals, the 522B is ever, are the applications in which the in arranged with two special terminals. One of strument is being used to measure time in these accepts a "start" signal, the other a tervals. "stop" signal. The purpose of these termi A device that makes accurate, high-speed nals is to open and close an electronic gate time interval measurements is an important in the instrument. When the gate is open, tool for investigating many phenomena, a standard frequency from an internal pre both electrical and mechanical, such as: cision oscillator and time base circuits is Stability applied (Fig. 2) to the instrument's counter Pulse duration circuits. The counters thus measure the Pulse interval number of cycles of the time base circuits Phase delay that the gate has been open, i.e., the time Velocity, linear and rotational between the start and stop signals. Flow The precision oscillator is arranged with Distance (in terms of time