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Automatic Rise Time Measurement

IP.com Disclosure Number: IPCOM000098186D
Original Publication Date: 1960-Apr-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Scray, EJ: AUTHOR

Abstract

In a system for automatically measuring rise time, pulses are applied to a programmable,variable delay 4 and the device 2 under test. The output of device under test 2 is applied to a mixer 6 which acts as a gate. The programmable, variable delay 4 produces pulse delays that are a function of input bias applied by an integrator 9. The output of variable delay 4 is applied to a pulse shaper and generator 5, the output of which causes the mixer gate 6 to turn on.

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Automatic Rise Time Measurement

In a system for automatically measuring rise time, pulses are applied to a programmable,variable delay 4 and the device 2 under test. The output of device under test 2 is applied to a mixer 6 which acts as a gate. The programmable, variable delay 4 produces pulse delays that are a function of input bias applied by an integrator 9. The output of variable delay 4 is applied to a pulse shaper and generator 5, the output of which causes the mixer gate 6 to turn on.

The output of the mixer is amplified and applied to a flip flop 8. If the amplitude of the signal from device under test 2 is greater than the pulse from the generator 5, no output appears from mixer 6 at pulse time and the flip flop does not change state. Integrator 9 then reverses direction causing the programmable,variable delay to change and a servo hunting action results. Once the sampled waveform is adjusted to modulate the sampling pulse so that extinction takes place, the time is read by a suitable voltage indicating device.

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