Preparing For Calibration; Accessing The Calibration/Test Menu - GE DigitalFlo XGM868i Service Manual

1.4.1 Preparing for Calibration

Prepare for the calibration procedure by connecting a Slot 0 analog output (or an independent calibrated current source)
to the desired input on the option card. See Figure 4 on page 12 to identify the IN(+) and RTN(-) pins for the desired
input on terminal block J2.
Note: The zero point of the analog input may be set for either 0 mA or 4 mA. However, the calibration always uses the
4 mA point, as the meter extrapolates this value to obtain the 0 mA point.

1.4.2 Accessing the Calibration/Test Menu

1. From the Keypad Program, press the right arrow key to scroll to the CALIB menu. Press [Enter].
2. In the Cal window, scroll to Slot 1. Press [Enter].
3. Scroll to the desired Input to open the ANALOG INPUT menu. (
Press [Enter].
Calibrating
IMPORTANT:
source on terminal block
4. Scroll to the appropriate option to select the reference point to be calibrated. Press [Enter].
The procedure for calibrating all the inputs is the same. However, when calibrating a different input, be
IMPORTANT:
sure to reconnect the current source at terminal block J2. See Figure 4 on page 12 for the correct pin
numbers.
5. Do one of the following:
•
Proceed to<Title Font> 4 mA Option on page 5.
•
Proceed to<Title Font> 20 mA Option on page 5.
1.4.2a 4 mA Option
Set the calibrated current source to 4 mA.
•
If you selected the 4 mA option in the ANALOG INPUT menu, scroll to STORE to accept the current 4 mA value or
on ABORT to cancel the entry. Press [Enter]. In either case, the XGM868i returns to the Analog Input window.
1.4.2b 20 mA Option
Set the calibrated current source to 20 mA.
•
If you selected the 20 mA option in the ANALOG INPUT option, scroll STORE to accept the current 20 mA value
or to ABORT to cancel the entry. Press [Enter]. In either case, the XGM868i returns to the ANALOG INPUT
window.
•
Press [Escape] to return to the Slot 1 window and calibrate additional inputs/outputs, or press [Escape] again to
close the CALIB menu.
DigitalFlow™ XGM868i Service Manual
or is identical to calibrating
Input B, C D
. Refer to Figure 4 on page 12 for the correct pin numbers.
J2
will be used as an example in this manual.)
Input A
. However, be sure to reconnect the current
Input A
Chapter 1. Calibration
5