why we use 250 ohms across HART CALIBRATOR DURING
CALIBRATION OF TRANSMITTER

Answer Posted / mohamadmerajalam

 I think 250 ohm use for drop the crrunt of circuit .If  I  use above the 250 ohm  i can't get sufficient output crrunt.one thinks more that if you increase or decrease the ohm as well as output crrunt  will be increase dearead . that's why i can't  exceeds resistance value 

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