Method and apparatus for introducing diagnostic pulses into an analog signal generated by an instrument
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United States of America Patent
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Sep 30, 1997
Grant Date -
N/A
app pub date -
Jan 10, 1997
filing date -
May 10, 1995
priority date (Note) -
Expired
status (Latency Note)
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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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