45
Reference Manual
00809-0100-4022, Rev GA
September 2016
AMS Device Manger
1.
Right click on the device and select
Calibrate
, then
D/A Trim
from the menu
.
2.
Select
Next
after setting the control loop to manual.
3.
Select
Next
after connecting the reference meter.
4.
Select
Next
at the
Setting fld dev output to 4mA
screen.
5.
Record the actual value from the reference meter, and enter it at the
Enter meter
value
screen and select
Next
.
6.
Select
Yes
, if the reference meter value equals the transmitter output value, or
No
if
it does not. Select
Next
.
a.
If
Yes
.
b. If
No
is selected, repeat
.
7.
Select
Next
at the
Setting fld dev output to 20 mA
screen.
8.
Repeat
until the reference meter equals the transmitter output value.
9.
Select
Next
to acknowledge the loop can be returned to automatic control.
10.
Select
Finish
to acknowledge the method is complete.
4.5.2
Digital-to-analog trim using alternate scale
The Scaled D/A Trim command matches the 4 and 20 mA points to a user selectable
reference scale other than 4 and 20 mA (e.g. 1 to 5 volts if measuring across a 250 ohm
load, or 0 to 100 percent if measuring from a Distributed Control System [DCS]). To perform
a scaled D/A trim, connect an accurate reference meter to the transmitter and trim the
output signal to scale, as outlined in the Output Trim procedure.
Note
Use a precision resistor for optimum accuracy. If you add a resistor to the loop, ensure the
power supply is sufficient to power the transmitter to a 20 mA output with additional loop
resistance.
Fast Keys
1, 2, 3, 2, 2
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