Emerson Rosemount OCX 8800 - D;A trim procedures - HART

Note
If you wish to exit D/A trim with no changes, step through the procedure using yes responses
and enter no meter readings.
4. Remove the electronics housing cover.
5. Refer to Figure 2-2. Connect a digital multimeter to read the milliamp output from
the COe D/A converter circuit. Connect the positive lead to the AOUT2+ terminal
and connect the negative lead to the AOUT2- terminal. Then touch Enter on the LOI.
The LOI displays 4 mA...Meter. The trim program inputs the design equivalent
signal for a 4.00 mA output.
6. Read the COe milliamp output at the digital multimeter. Use Right to select each
digit and use Up and Down to change the value. When the correct value is displayed,
use Enter to input the value.
The LOI displays 20 mA...Meter. The trim program inputs the design-equivalent
signal for a 20.00 mA output.
7. Read the O
2
milliamp output at the digital multimeter. Use Right to select each digit
and use Up and Down to change the value. When the correct value is displayed, use
Enter to input the value.
The LOI displays a Meter at 4 mA prompt (question).
8. Use Right to select yes or no. Use Up or Down to change the selection. Then use Enter
key to input the response. If no, the process repeats from step 7.
The LOI displays a Meter at 20 mA prompt (question).
9. Use Right to select yes or no. Use Up or Down to change the selection. Then use Enter
to input the response. If no, the process repeats from step 8.
When the responses in steps 8 and 9 are yes, the trim procedure is complete.
10. Exit the LOI menu and return the control loop to automatic control.
5.6
D/A trim procedures - HART
5.6.1 O
2
D/A trim procedure using HART
Use the following procedure to perform the O
2
D/A trim procedure using the Field
Communicator.
If necessary, refer to Section 6.3 for the HART menu tree.
Note
To select a menu item, either use Up and Down to scroll to the menu item and press Right or use the
number keypad to select the menu item number. To return to a preceding menu, press Left.
Calibration
Reference Manual 79