
18
Reference Manual
00809-0100-4803, Rev DA
Section 4: Operation and Maintenance
April 2013
Operation and Maintenance
4.3.6 Analog calibration
Figure 4-5. Calibration - analog calibration tab
Analog output trim
The Analog Output Trim commands allow the user 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 Figure 4-5.
To perform an analog trim, click on the Analog Trim button and follow the on-screen prompts.
Scaled analog output trim
The scaled analog trim command matches the 4 and 20 mA points to a user selectable reference
scale other than 4 and 20 mA (for example, 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
analog trim, connect an accurate reference meter, click on the Scaled Analog Trim button, and
follow the on-screen prompts.
Note
Use a precision resistor for optimum accuracy. When adding a resistor to the loop, ensure that
the power supply is sufficient to power the transmitter to a 23 mA (maximum high alarm)
output with the additional loop resistance.
Mass and Energy Flow Fast Keys 1, 2, 5, 2
Direct Process Var. Output Fast Keys 1, 2, 4, 5
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