Browse Prior Art Database

Pulse Measuring

IP.com Disclosure Number: IPCOM000098871D
Original Publication Date: 1958-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 44K

Publishing Venue

IBM

Related People

Purcell, JA: AUTHOR [+2]

Abstract

This disclosure describes a system capable of sampling a pulse and measuring its rise time, fall time, and pulse width as defined by arbitrary 10% and 90% voltage levels, for both the rise and fall of the pulse. A coincidence circuit is used to provide triggering pulses having a point in time corresponding to these selected reference levels and a time measuring circuit is utilized to appropriately select any two of these triggering pulses and convert the time elapse between each to a voltage amplitude for providing a measure of the parameter so defined.

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Pulse Measuring

This disclosure describes a system capable of sampling a pulse and measuring its rise time, fall time, and pulse width as defined by arbitrary 10% and 90% voltage levels, for both the rise and fall of the pulse. A coincidence circuit is used to provide triggering pulses having a point in time corresponding to these selected reference levels and a time measuring circuit is utilized to appropriately select any two of these triggering pulses and convert the time elapse between each to a voltage amplitude for providing a measure of the parameter so defined.

In addition to a pulse selector switch, the time measuring circuit utilizes two triggers, with one producing a negative going output voltage level change in response to the first triggering pulse and a second producing a positive going voltage level change in response to a second selected triggering pulse. A peak detection device is then used to follow the lowest voltage output level of either of the two triggers with the largest magnitude thereof being a measure of the time period between

the two selected triggering pulses and a measure of the parameter defined thereby. As shown, the coincidence circuit for producing the triggering pulses may comprise AND and OR circuits, each having one input responsive to a voltage divider for providing the defined reference points exemplified by 10% and 90% and another input responsive to the sampled pulses. The sampled pulses may be changed to a lower frequenc...