2. Test the discrete outputs.
a. Choose Device Tools > Diagnostics > Testing > Discrete Output Test.
b. Set Fix To: to ON.
c. Verify the signal at the receiving device.
d. Set Fix To: to OFF.
e. Verify the signal at the receiving device.
f. Click UnFix.
3. Test the TPS output.
a. Attach a frequency counter, oscilloscope, digital multimeter (DMM), or digital
voltmeter (DVM) to the TPS output loop.
b. Compare the reading to the Sensor Time Period process variable at your meter.
Postrequisites
• If the mA output readings are within 200 microamps of each other, you can correct
this discrepancy by trimming the output.
• If the discrepancy between the mA output readings is greater than 200 microamps,
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 readings are reversed, check the setting of Discrete Output
Polarity.
• If the TPS output readings do not match, contact Micro Motion customer service.
14.4.3
Perform loop tests using the Field Communicator
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.
Procedure
1. Test the mA outputs.
a. Choose Service Tools > Simulate > Simulate Outputs > mA Output 1 Loop Test or
Service Tools > Maintenance > Simulate Outputs > mA Output 2 Loop Test, and
select 4 mA.
b. 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.
c. Press OK.
Troubleshooting
150 Micro Motion
®
Gas Specific Gravity Meters (SGM)
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