Method and apparatus for introducing diagnostic pulses into an a

Details Method and apparatus for introducing diagnostic pulses into an a Method and apparatus for introducing diagnostic pulses into an a

1997-01-10

1997-09-30

Beausoliel, Jr., Robert W.

Excavating

371 30, 364550, 34087004, G08C 1508

Patent

active

056732783

ABSTRACT:
A method and apparatus for notifying a receiving device of fault conditions in a sensing element or an instrument. The instrument generates an analog signal that has an amplitude which is representative of a variable. The analog signal amplitude has a range defined by a lower limit and an upper limit. The instrument transmits the analog signal to the receiving device. When the instrument detects a fault condition in itself or in the sensing element, the transmitter periodically changes the analog signal amplitude by a predetermined amplitude for as long as the fault condition exists. The predetermined amplitude and its polarity are such that the amplitude of the periodically changed analog signal lies within the range. The receiving device generates an alarm when it detects the pulses.

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patent: 5420578 (1995-05-01), O'Brien et al.
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