Emerson Rosemount 4600 Reference Manual page 51

Reference Manual
00809-0100-4022, Rev GA
AMS Device Manger
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b. If No is selected, repeat
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4.5.2 Digital-to-analog trim using alternate scale
Fast Keys
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.
Operation and Maintenance
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Right click on the device and select Calibrate, then D/A Trim from the menu
Select Next after setting the control loop to manual.
Select Next after connecting the reference meter.
Select Next at the Setting fld dev output to 4mA screen.
Record the actual value from the reference meter, and enter it at the Enter meter
value screen and select Next.
Select Yes, if the reference meter value equals the transmitter output value, or No if
it does not. Select Next.
If Yes is selected, proceed to
Step
Select Next at the Setting fld dev output to 20 mA screen.
Repeat Step 5 - 6 until the reference meter equals the transmitter output value.
Select Next to acknowledge the loop can be returned to automatic control.
Select Finish to acknowledge the method is complete.
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Operation and Maintenance
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