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The readings do not need to match exactly. If the values are slightly different,
you can correct the discrepancy by trimming the output.
i. Click UnFix mA.
2. Test the frequency output(s).
a. Choose ProLink > Test > Fix Freq Out.
b. Enter the frequency output value in Set Output To.
c. Click Fix Frequency.
d. Read the frequency signal at the receiving device and compare it to the
transmitter output.
e. Click UnFix Freq.
3. Test the discrete output(s).
a. Choose ProLink > Test > Fix Discrete Output.
b. Select On.
c. Verify the signal at the receiving device.
d. Select Off.
e. Verify the signal at the receiving device.
f. Click UnFix.
Postrequisites
• If the mA output reading at the receiving device was slightly inaccurate, you can
correct this discrepancy by trimming the output.
• If the mA output reading at the receiving device was significantly inaccurate, or if at
any step the reading was faulty, verify the wiring between the transmitter and the
remote device, and try again.
• If the discrete output reading is reversed, check the setting of Discrete Output Polarity.
10.12.4 Perform loop tests using ProLink III
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
Before performing a loop test, configure the channels for the transmitter inputs and
outputs that will be used in your application.
Follow appropriate procedures to ensure that loop testing will not interfere with existing
measurement and control loops.
ProLink III must be running and must be connected to the transmitter.
Troubleshooting
198 Micro Motion
®
Model 1700 Transmitters with Analog Outputs