Emerson Rosemount 3408, Справочное руководство, Страница: 90 / 104

Set timeline resolution
To set the resolution of the level trend timeline:
Procedure
1. Select Service Tools
→
Echo Curve .
2. Select Options .
3. In the Timeline Resolution list, select the desired length (in hours) of the timeline.
4. Select Save .
5. Select
Back
.
7.4.2 Perform an analog loop test
During a loop test, the transmitter outputs a fixed value (4 mA, 20 mA, or user-selected
value).
The loop test command verifies the output of the transmitter, the integrity of the loop,
and the operations of any recorders or similar devices installed in the loop. A loop test can
also be used to determine the need for an analog output calibration.
Procedure
1. Select
Service Tools
→
Simulate
.
2. Under Analog Out , select Loop test , and then follow the on-screen instructions.
3. Measure the loop current.
Postrequisites
Select
Stop
or
Cancel
to exit loop test (
Abort
on handheld communicator).
Related information
Calibrate analog out
Simulation/test active
7.4.3 Calibrate analog out
Use this function to calibrate the analog output by comparing the actual output current
with the nominal 4 mA and 20 mA currents. Calibration is done at factory and the analog
output does not normally need to be recalibrated.
Procedure
1. Select Service Tools → Maintenance → Routine Maintenance .
2. Select D/A trim ( Calibrate Analog Out in Rosemount Radar Master Plus) and follow
the on-screen instructions.
Service and troubleshooting Reference Manual
September 2022 00809-0100-4418
90 Emerson.com/Rosemount