Signal conditioning circuit for trigger probe

Details Signal conditioning circuit for trigger probe Signal conditioning circuit for trigger probe

1992-02-07

1993-12-28

Cuchlinski, Jr., William A.

Geometrical instruments

Gauge

Movable contact probe, per se

33558, G01B 703

Patent

active

052728170

ABSTRACT:
A touch trigger probe has electrical contacts. A comparator compares the resistance of the contacts with a threshold, in order to generate a repeatable trigger signal when the contacts open. To ensure that the trigger signal can be generated reliably even if the resistance of the contacts when closed should increase, the threshold set is variable. The threshold can, for example, be set by a sample and hold circuit which tracks the resistance of the contacts when closed.

REFERENCES:
patent: 4153998 (1979-05-01), McMurtry
patent: 4177568 (1979-12-01), Werner et al.
patent: 4187362 (1979-04-01), Archer
patent: 4512083 (1985-04-01), Schmitt et al.
patent: 4769919 (1988-09-01), Lloyd et al.
patent: 4785545 (1988-11-01), Aubele
patent: 5024003 (1991-06-01), Breyer
patent: 5084696 (1992-01-01), Guscott et al.
patent: 5090131 (1992-02-01), Deer

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