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Loop Calibrator to Simulate a 4-20 mA Signal

Suppose a technician wishes to use a loop calibrator to simulate a 4-20 mA signal to a controller, and decides to connect the loop calibrator to the circuit like this:

Loop Calibrator to Simulate a 4-20 mA Signal

Loop Calibrator to Simulate a 4-20 mA Signal

Explain why this is an improper use of the loop calibrator, and what will happen if the technician tries to simulate a 9 mA signal this way. Finally, identify the proper way to use the loop calibrator to simulate a transmitter signal.

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Credits: Tony R. Kuphaldt

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1 comment

saurav kumar gupta February 13, 2020 at 10:36 am

The calibrator is not even in closed loop and it is connected as a parallel dc source which will add more mili amps to the instrument additional to the controller mamps supply. Thus the operation of the instrument will be not as expected.

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Loop Calibrator to Simulate a 4-20 mA Signal

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