Hewlett-packard Company

David J Rustici

Kenneth Paul Parker

David E Smith

Dean C Buck

Richard E Warren

Daniel G Bihn

James L Hutchinson

Joseph M Lagrotta

Hiroyuki Ohki

Takanori Uematsu

Muneo Kawabata

Keisuke Takaura

A boundary scan testing device is presented which does not provide a boundary scan test vector generating function for producing boundary scan test vectors corresponding to the boundary scan device under test. Instead, the boundary scan testing device operates based on test vectors produced elsewhere.

Boundary scan testing device

A recycling ramp interpolator is described which can provide multiple measurements for a single input trigger signal by maintaining initial input waveform reference and interpolating multiple times before completely discharging. The interpolator reference voltage can be changed to provide effective sampling intervals of fractions less than one of the clock period.

Recycling ramp interpolator

An electronic distance meter is interfacable to a controller and measures distance to a moving target by comparing the phase of a signal propagated to the target with the phase of the reflected signal. A time mark indicating when the measurement was made is corrected by an offset to compensate for an apparent distance error related to the doppler effect. The corrected time mark indicates when the target was actually at the apparent distance. An asynchronously resettable timer provides measurement-to-measurement elapsed time information so that position-in-time and velocity data may be obtained. A multi-valued annunciator indicates the integrity of the target signal path.

Distance transducer

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Loveland, CO, United States of America

David J Rustici