Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – Frequency of cyclic current or voltage
Patent
1976-05-28
1977-10-25
Olms, Douglas W.
Electricity: measuring and testing
Measuring, testing, or sensing electricity, per se
Frequency of cyclic current or voltage
324 99D, H04B 346
Patent
active
040557332
ABSTRACT:
A device for measuring the power of analog signals on telephone lines in a data communications network. A selection circuit couples a selected analog signal from one of the telephone lines to a measuring circuit. A full-wave rectifier and a low pass filter process and convey the selected signal to a plurality of open-loop comparators. Each comparator produces a binary signal that indicates whether the selected signal is greater or less than a reference power that corresponds to a predetermined power level. Each comparator energizes an inverter and driver that in turn energizes a light-emitting diode thereby to indicate the line signal power visually. However, the drivers are interconnected so only one light-emitting diode is energized at any given time. A blanking circuit disables the light-emitting diodes when rapid signal level changes occur. A self-testing circuit includes a damped oscillator for testing all the circuitry in the measuring device.
REFERENCES:
patent: 3349195 (1967-10-01), Gray
patent: 3766474 (1973-10-01), MacDonald
patent: 3927571 (1975-12-01), Athey
Falkenstein Don I.
Holsinger Jerry L.
Lezotte Frank B.
Williams David E.
Intertel, Inc.
Olms Douglas W.
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