A Faster Telemeter for Carrier-Current Channels

This new frequency-type telemetering system combines continuous measurement and fast response with high accuracy and stability of calibration. It uses as a translating means an alternating electric signal whose frequency is directly proportional to the measured quantity. This signal originating in a contactless transmitter can be used to modulate or key carrier-current channels of conventional fixed frequency types. It is the frequency of this signal rather than its magnitude which is detected by the receiver and converted without moving parts into a proportional direct current sufficient to operate a conventional indicating or recording instrument. This system in its basic form was developed to telemeter a-c watts, vars, volts, and amperes. Auxiliary equipment is available to permit telemetering practically any other electrical or nonelectrical quantity.