Agilent 1958-04 free download

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HEWLETT- PAC K ARD 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 5UBLISHED BY THE HEWLETT-PACKARD COMPANY, 275 PAGE MILL ROAD, PALO ALTO, CALIFORNIA APRIL, 1958 A Precision Delayed-Pulse Generator For Measuring and Generating Short Time Intervals DELAYED-PULSE generators, i.e., genera tervals formed by the three pulses are each tors that produce a pulse at a known and separately adjustable by calibrated panel con selectable time following a trigger signal, give trols over a range from 1 to 10,000 microsec the laboratory and production engineer an ex onds from time zero in digital steps of 1 micro cellent tool with which to measure and estab second and with continuous interpolation be lish accurate time intervals in the microsecond tween steps. The pulses have less than ±0.01 to millisecond region. Checking radar, loran, microsecond jitter, and their time of occurrence DME and Tacan system range calibration, is accurate within ±0.1 microsecond ±0.001 % measuring resolution of fast circuits, measur of the selected delay. Three plug-in type output ing or simulating fast gates, and measuring de circuits have also been designed to provide the lays in circuits and devices are typical of the pulses with optimum characteristics for a given measuring situations where such a generator application. is applicable. The generator is particularly distinguished The new digital delay generator shown in by the fact that it is a direct slave to the external Fig. 1 provides an initial time zero reference trigger, which can have a random rate, but at pulse and two positionable pulses (Fig. 2), all the same time generates selectable delays di of which are accurately known in time with rectly from a crystal-controlled oscillator. The respect to an external trigger pulse. The two instrument can also trigger from an internal positionable pulses and thus the two time in rate circuit over a 10 cps to 10 kc range. P R I N T E D I