Instruction manual

Instruction Manual
760006-A
September 2001
11-34 Appendices Rosemount Analytical Inc. A Division of Emerson Process Management
Model NGA 2000 Platform
Calibration Procedure
Perform the Output signal zero and span cali-
bration procedures as follows:
Out
p
ut calibration
Out
p
ut number: 1
O
p
eration mode: NORMAL
Fine ad
j
ustment for 0% out
p
ut: 4095
Fine ad
j
ustment for 100% out
p
ut: 10
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1. Select the output channel to calibrate by
editing the Output number: line.
2. Enter the Output calibration menu by
making selections in the following path:
Main Menu, Expert controls and setup
Menu, Auxiliary module setup Menu, Lo-
cal I/O setup Menu, Analog Output Setup
Menu and press ADJUST softkey.
3. To perform both the zero and span cali-
bration procedures, the operator must use
output values obtained from a calibrated
digital voltmeter or other sensing device
connected to the I/O Module output.
4. In the Analog Output Menu, choose the
desired current range, depending on out-
put requirements.
5. Measure the output either on the voltage
or the current terminals as desired.
6. Choose Adjust 0V on the Operation
mode line.
7. Measure the output voltage and edit the
number shown on Fine adjustment for 0%
output: until the output is zero.
8. Set Operation mode to Adjust 10V.
9. Adjust, if necessary, the output value by
scrolling the Fine adjustment for 0% out-
put: until the output value is 10V (or full
scale).
10. Repeat for the other output channels
After completing the span calibration proce-
dure, the operator should recheck and read-
just, if necessary, the zero calibration values.
NOTE
The Local I/O module does not
measure its own output signal as
does the Analog I/O module.