Answer / xyz

If we do not use 250 ohm resistance then our HART calibrator
shall connect directly to power source, hence it won't be
part of our transmitter loop.

Answer / hansdas b.jaiswal

WE USE 250 OHMS RESISTANCE ACROSS HART CALIBRATOR DURING
CALIBRATION OF TRANSMITTER DUE TO LOAD GIVEN TO TRANSMITTER
FOR COMMUNICATION PURPOSE

Answer / sankar

Loop Impedance required for communicator will be minimum
250ohms

Answer / 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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