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Window detector
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<p>A window detector circuit, also called window comparator circuit or dual edge limit detector circuits is used to determine whether an unknown input is between two precise reference threshold <a href="/facts/Voltage/EN2po6N2">voltages</a>. It employs two <a href="/facts/Comparator/jfk32rf6">comparators</a> to detect over-voltage or under-voltage. </p><p>Each single comparator detects the common input voltage against one of two reference voltages, normally upper and lower limits. Outputs behind a logic gate like AND detect the input as in range of the so-called "window" between upper and lower reference. </p><p>Window detectors are used in industrial alarms, <a href="/facts/Level_sensor/fsrfvIDP">level sensor</a> and controls, digital <a href="/facts/Computers/SQe1aK05">computers</a> and production-line testing. </p>