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10.12.1 Perform loop tests using the display
A loop test is a way to verify that the transmitter and the remote device are
communicating properly. A loop test also helps you know whether you need to trim mA
outputs.
Prerequisites
Follow appropriate procedures to ensure that loop testing will not interfere with existing
measurement and control loops.
Procedure
1. Test the mA output(s).
a. Read the mA current at the receiving device and compare it to the transmitter
output.
The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
b. At the transmitter, activate Select.
c. Scroll to and select a high value, e.g., 20 mA.
Dots traverse the display while the output is fixed.
d. Read the mA current at the receiving device and compare it to the transmitter
output.
The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
e. At the transmitter, activate Select.
2. Test the frequency output(s).
a. Choose OFFLINE MAINT > SIM > FO SIM, and select the frequency output value.
The frequency output can be set to 1, 10, or 15 kHz.
Note
If the Weights & Measures application is enabled on the transmitter, it is not possible to
perform a loop test of the frequency output, even when the transmitter is unsecured.
Dots traverse the display while the output is fixed.
b. Read the frequency signal at the receiving device and compare it to the
transmitter output.
c. At the transmitter, activate Select.
3. Test the discrete output(s).
Troubleshooting
Configuration and Use Manual 175