Remote acoustic monitoring device which is testable by variation of the supply voltage
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United States of America Patent
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-
Apr 24, 1984
Grant Date -
N/A
app pub date -
Jul 6, 1981
filing date -
Jul 8, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In an industial installation which is inaccessible during operation, acoustic-emission testing of each measurement line is performed by means of at least one transducer and a preamplifier which is connected to an acoustic signal processing unit by means of a signal transmission line and a supply line. A potentiometer circuit placed on the supply line produces a variation in the supply voltage and remotely operates a relay for switching the measurement line to testing means comprising a local pulse generator connected between the transducer and the preamplifier.
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