| http://www.w3.org/ns/prov#value | - The time interval may be adjustable over a range, such as for example, from a few seconds up to a minute or more depending on the characteristics of the particular machine with which the detector is being used. lf the signal from the circuit 124 is present or absent for the predetermined time interval, the Schmitt trigger fires to change the state of a bistable circuit shown as flip-flop 128.
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