Emerson AMS Trex User Manual page 156

Loop Diagnostics application
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Figure 4-20: Connection for providing power and simulating a transmitter
A. Analog input.
On the Loop Diagnostics screen, tap Trex Unit Power.
Tap Simulate Transmitter with 4 mA.
Change the current value by pressing the quick buttons or the up and down arrow
keys.
Verify the digital control system is reading the same current value.
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