6 Perform a loop test
The analog loop test verifies the output of the transmitter, the integrity of
the loop, and the operations of any recorders or similar devices installed in
the loop. To initiate a loop test, follow the steps below.
The host system may provide a current measurement for the 4–20 mA
HART
®
output. If not, connect a reference meter to the transmitter by either
connecting the meter to the test terminals on the terminal block, or
shunting transmitter power through the meter at some point in the loop.
6.1 Perform a loop test on the traditional interface
Procedure
1. Connect an external ampere meter in series with the transmitter
loop.
The power to the transmitter should go through the meter at some
point in the loop.
2. From the Home screen, select 644H and 644R: 1 Device Setup > 2
Diag/Serv > 1 Test Device > 1 Loop Test.
3. Select a discrete milliampere level for the transmitter to output.
• At Choose Analog Output, select 1 4mA or 2 20mA
• Select 3 Other to manually input a value between 4 and 20
milliamperes.
4. To show the fixed output, select Enter.
5. Select OK.
6. In the test loop, verify the transmitter’s actual mA output and the
HART
®
mA reading are the same value.
If the readings do not match, either the transmitter requires an
output trim or the meter is malfunctioning.
After completing the test, the display returns to the loop test screen
and allows you to choose another output value.
7. To end the loop test, select 5 End and Enter.
6.2
Perform a loop test on the device dashboard
Procedure
1. Connect an external ampere meter in series with the transmitter
loop.
The power to the transmitter should go through the meter at some
point in the loop.
April 2019 Quick Start Guide
Quick Start Guide 25
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