GE DigitalFlo XGM868i, Руководство по обслуживанию

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DigitalFlow™ XGM868i Service Manual 5
Chapter 1. Calibration
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. (
Input A
will be used as an example in this manual.)
Press
[Enter].
IMPORTANT:
Calibrating
Input B, C
or
D
is identical to calibrating
Input A
. However, be sure to reconnect the current
source on terminal block
J2
. Refer to Figure 4 on page 12 for the correct pin numbers.
4. Scroll to the appropriate option to select the reference point to be calibrated. Press [Enter].
IMPORTANT:
The procedure for calibrating all the inputs is the same. However, when calibrating a different input, be
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.