Milliamp Measure; Milliamp Measure With Loop Power - Ecom MA 400 Operating Instructions Manual

4.3 Milliamp Measure

Figure 5 shows how to connect the MA 400 to measure a 4-0 mA loop. In this application the
MA 400 is simply reading the loop current and displaying the current in mA on the main display.
The lower (smaller) display area is showing percentage relative to a 4 to 0 mA span.

4.4 Milliamp Measure with Loop Power

Again, Figure 5 shows the proper connections. But in this case the device under test is a twowire
transmitter that requires an external power supply to generate an output current. In this
application the MA 400 will supply 4 volts to the loop while simultaneously measuring the resultant
loop current. To turn on the loop power supply press the key while in the mA measure mode.
NOTE: The loop power mode can only be enabled while in the mA measure mode.
Figure 5 - Measuring 4 to 20 mA
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