Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With rotor
Patent
1989-03-31
1990-08-07
Karlsen, Ernest F.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
With rotor
307263, 307475, 371 201, G01R 3102, H03K 512, H03K 19092
Patent
active
049471139
ABSTRACT:
A method and apparatus for providing pulse signals from a driver circuit in an in-circuit overdrive/functional tester to a probe, which tester provides a control signal representative of a command for the driver circuit to provide logic signals, includes adjusting the transition time of the logic signals so that the transition time is equal to twice the time it takes the pulse signal to travel from the driver circuit to the end of the probe and back. The method or apparatus for adjusting the rise time of the control signal can include adjusting the slew rate of the control signal. Pulse signals produced by such a method or apparatus have clean edges, have slew rates which are twice as fast as the slew rates of the driver signals and have zero propagation delay when measured at the fifty percent point.
REFERENCES:
patent: 3781689 (1973-12-01), Marshall et al.
patent: 3965468 (1976-06-01), Bronson
patent: 4439858 (1984-03-01), Petersen
patent: 4507576 (1985-03-01), McCracken et al.
patent: 4588945 (1986-05-01), Groves et al.
Zehntel Advertisement, Electronics Magazine, May 12, 1988 edition.
Chism Wayne R.
King Philip N.
Hewlett--Packard Company
Karlsen Ernest F.
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