4-7
Transmitter Functions
4–20 mA Output Trim For maximum accuracy, the analog output should be calibrated and, if
necessary, trimmed for your system loop. The 4–20 mA Output Trim
procedure alters the conversion of the digital signal into an analog
4–20 mA output.
Use the following steps to complete this function.
1. Set the loop to manual, if necessary.
2. Connect a precision ammeter to the 4–20 mA loop.
3. Initiate the Output Trim function with the LOI or
HART Communicator.
4. Enter the 4 mA meter value when prompted to do so.
5. Enter the 20 mA meter value when prompted to do so.
6. Return the loop to automatic control, if necessary.
The 4–20 mA trim is now complete. You may repeat the 4–20 mA trim
to check the results, or use the analog output test.
Loop Test The Loop Test allows you to drive the transmitter output to a desired
electric current output on the 4–20 mA terminals. This capability
allows you to check the entire current loop prior to start-up. The test
will terminate after five minutes if the transmitter is not returned to
normal operation manually.
HART Fast Keys
1, 2, 4, 1
LOI
Transmitter Trim
HART Fast Keys 1, 2, 2
LOI Transmitter Test
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