44
Reference Manual
00809-0100-4022, Rev GA
September 2016
4.5
Analog output trim
The Analog Output Trim commands allow you to adjust the transmitter’s current output at
the 4 and 20 mA points to match the plant standards. This command adjusts the digital to
analog signal conversion (see
).
4.5.1
Digital-to-analog trim
Field Communicator
To perform a digital-to-analog trim with a Field Communicator, perform the following
procedure.
1.
From the
Home
screen, enter the Fast Key sequence shown. Select
OK
after setting
the control loop to manual, see
“Setting the loop to manual” on page 4
2.
Connect an accurate reference ammeter to the transmitter at the
Connect Reference
Meter
prompt. Connect in series with the signal loop, or shunt power through the
reference meter at some point.
3.
Select
OK
after connecting the reference meter.
4.
Select
OK
at the
Setting Fld Dev Output To 4 MA
prompt. The transmitter outputs
4.0 mA.
5.
Record the actual value from the reference meter, and enter it at the
Enter Meter
Value
prompt. The Field Communicator prompts you to verify whether or not the
output value equals the value on the reference meter.
6.
Select
1: Yes
, if the reference meter value equals the transmitter output value, or
2: No
if it does not.
a.
If
1
is selected
:
Yes
, proceed to
b. If
2
is selected
:
No
.
7.
Select
OK
at the
Setting Fld Dev Output To 20 MA
until the reference meter value equals the transmitter output value.
8.
Select
OK
after the control loop is returned to automatic control.
Fast Keys
1, 2, 3, 2, 1
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