When using a multimeter to drive loop current, the meter should be set to which mode?

When using a multimeter to drive loop current, selecting the output mA mode is essential because this function allows the multimeter to generate a certain current level in a circuit, simulating the operation of a field instrument. The output mA mode is designed specifically for this purpose and allows for precise control of the current supplied to the loop, enabling technicians to test and calibrate instruments effectively and ensure they are functioning within the desired specifications.

This setting facilitates the adjustment of the loop current while measuring the response of the connected devices, providing valuable insight into their performance characteristics. For example, when calibrating a control valve or a transmitter, using the output mA mode enables the technician to establish and verify the correct operation at various set points within the specified range of the instrument.

Utilizing this mode optimizes the efficiency and accuracy of loop testing procedures, which is crucial for maintaining operational integrity in industrial processes and instrumentation systems.