5 Perform a loop test
5.1 Overview
The loop test command verifies transmitter output, loop integrity, and
operation of any recorders or similar devices installed in the loop.
Note
This is not available with the Rosemount 248C Configuration Interface.
5.2 Initiate loop test
Procedure
1. Connect an external ampere meter in series with the transmitter loop
(so the power to the transmitter goes through the meter at some
point in the loop).
2. From the Home screen, select: 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. 4 mA, 2. 20 mA, or 3. Other to
manually input a value between 4 and 20 mA.
4. Select Enter to show the fixed output.
5. Select OK.
6. In the test loop, check that the fixed mA input and the transmitter’s
mA output are the same value.
Note
If the readings do not match, either the transmitter requires an
output trim or the current meter is malfunctioning.
After completing the test, the display returns to the loop test screen and
allows you to choose another output value.
5.3
End the loop test
Procedure
1. Select 5. End.
2. Select Enter.
Quick Start Guide February 2021
16
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