Emerson Rosemount OCX 8800 Reference Manual page 90

Calibration
Procedure
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
80
Prom the DIAG/SERVICE menu, select D/A TRIM. Select O2 D/A TRIM.
Press Right to start the procedure.
If you wish to exit D/A Trim with no changes, select ABORT.
The Field Communicator displays WARNING: Loop should be removed from
automatic control.
Remove the transmitter from any automatic control loops to avoid a potentially
dangerous operating condition and press OK.
The Field Communicator displays Connect reference meter to O2
output.
Remove the electronics housing cover.
Refer to Figure 2-2. Connect a digital multimeter to read the milliamp output from
the O D/A converter circuit. Connect the positive lead to the AOUT1+ terminal and
2
connect the negative lead to the AOUT1- terminal. Then press OK on the Field
Communicator.
The Field Communicator displays Setting Fld dev output to 4 mA.
Press OK. Read the O milliamp output at the digital multimeter. Enter the reading
2
in the Field Communicator and press ENTER.
Select ABORT to exit without changes.
The Field Communicator displays Setting Fld dev output to 20 mA.
Press OK. Read the O milliamp output at the digital multimeter. Enter the reading
2
at the Field Communicator and press ENTER.
Select ABORT to exit without changes.
The Field Communicator displays Setting Fld dev output to 4 mA.
Press OK.
The Field Communicator displays Fld dev output 4.00 mA equal to
reference meter?
Using Up or Down, select 1 Yes or 2 No. Press ENTER.
If No, the process repeats from step 5.
The Field Communicator displays Setting Fld dev output to 20 mA.
Press OK.
The Field Communicator displays Fld output 20.00 mA equal to
reference meter?
OCX 8800