Martel Electronics LC100 - Manual (Page 11)

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5) The auto step feature provides automated
output changes. Refer to the Auto Modes
Section of the manual for more information.
B. Milliamp Simulation
Figure 4 shows how to connect the LC100 to
act as a two-wire transmitter using an external
power supply. In this application the power for
the loop comes from the external supply and
the LC100 simply controls the current flow
through the loop. The procedure for controlling
the output is the same as the milliamp source.
Figure 4 - Simulating 4 to 20 mA
C. Milliamp Measure
Figure 5 shows how to connect the LC100 to
measure a 4-20 mA loop. In this application the
LC100 is simply reading the loop current and
displaying the current in mA on the main dis-
play. The lower (smaller) display area is show-
ing percentage relative to a 4 to 20 mA span.