Published:2009/7/10 23:27:00 Author:May | From:SeekIC
Output of low-level transducer such as temperature bridge can be transmitted reliably over long wires (100feet or more) in serial form if changes in 100-ohm resistive thermal device (RTD) are converted to corresponding changes in frelquency with almost any commercially available V/F converter, Typical converter has 0-10 V fullscale analog input and 0-10 kHz output. If 5 V is applied to input, output pulse train will have rate of 5 kHz ±0.5 Hz, which can be counted for 1 s or less and displayed on digital readout to show analog value Instrument amplifier can be Datel AM201 or equlvaient.-E. L. Murphy,Sending Transducers Signals over 100 Feet?,Instuments Control & Systems,June 1976,p 35-39.
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