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Pulse Measurements

IP.com Disclosure Number: IPCOM000088381D
Original Publication Date: 1977-Jun-01
Included in the Prior Art Database: 2005-Mar-04
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Posner, DA: AUTHOR [+2]

Abstract

A recurrent pulse can be evaluated to a high degree of accuracy with relatively coarse measurements.

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Pulse Measurements

A recurrent pulse can be evaluated to a high degree of accuracy with relatively coarse measurements.

A requirement for the described technique to be used is that the pulse duration T be at least two plus a fraction of a period T or more sample periods in duration. The sampling pulses sample the pulse to be measured repetitively over a fixed period of time. The sampling is digitized and stored in the digital memory and then supplied to a programmed general purpose computer which acts as a statistical computer. Then the central limit theorem of statistics is applied via the programming in the statistical computer to calculate mean and standard deviation of pulse durations. The accuracy achieved varies directly as the square root of the number of samples taken. Also, the sample frequency should not be a submultiple of pulse duration.

Once the mean value, i.e., mean pulse duration, is established, deviations beyond certain limits of individual pulses can be identified. Such deviations can give a figure of merit of reliability of the system being tested (not shown).

The described technique, using a 480 nanosecond sample rate, is capable of measuring a six microsecond duration signal to a period of less than 100 nanosecond accuracy with relatively modest measurement equipment. An indication of the accuracy can be indicated by the standard deviation.

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