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Why ues 250 ohms Resistor during hart type instruments
calibration with hart protocol in details ?
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Answer Posted / anzal
WHILE USING COMMUNICATOR ITS NEED 250 OHM IN BETWEEN THE TRANSMITTER AND POWER SUPPLY......
THE COMMUNICATOR INJECT HIGH FREQUENCY IN LOOP FOR COMMUNICATING PURPOSE............
IN POWER SUPPLY USING LOW PASS FILTER...
LOW PASS FILTER ALOVE ONLY LOW FREQUENCY..HIGH FREQUENCY IT WILL BLOCK..........
THAT'S WHY IN BETWEEN 250 OHMS NEED...OTHERWISE IT WILL BLOCK THE HIGH FREQUENCY...IF HIGH FREQUENCY BLOCK IT CANNOT COMMUNICATE WITH TRANSMITTER..........
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