B.4.2 Analog Inputs
Analog inputs may be added to the Model XGM868i by installing an appropriate option card in
contains two or four analog inputs, which are designated as A, B, C and D. Both the zero-point and full-scale values for
each input must be calibrated.
Calibration of the analog inputs requires the use of a calibrated current source. If an independent calibrated current
source is not available, one of the
calibration, the
analog output will supply the low reference, high reference, 4 mA and 20 mA signals at the
Slot 0
appropriate times.
If a
analog output will be used to calibrate the analog inputs, the
IMPORTANT:
Slot 0
procedure must be completed first.
Prepare for the calibration procedure by connecting a
of the option card. See Figure 4 on page 12 to identify the
Input A
Note: The zero point of the analog input may be set for either 0 mA or 4 mA. However, the calibration procedure
always uses the 4 mA point, as the meter will extrapolate this value to obtain the 0 mA point.
1. In the center pane of the Calibration/Test window, double-click on Slot 1.
2. Double-click on the desired input to open the Analog Input menu. (
manual.)
Calibrating
IMPORTANT:
source on terminal block
3. Double-click on the appropriate option to select the reference point to be calibrated.
Proceed to the corresponding sub-section for specific instructions on each of the options available in step 3.
B.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, double-click on Store to accept the current 4 mA value or
on Abort to cancel the entry. In either case, the Analog Input prompt reappears.
B.4.2b 20 mA Option
Set the calibrated current source to 20 mA.
•
If you selected the 20 mA option in the Analog Input menu, double-click on Store to accept the current 20 mA value
or on Abort to cancel the entry. In either case, the Analog Input prompt reappears.
Click [Exit Page] to return to the Slot 1 window and calibrate additional inputs/outputs, or click [Exit Page] again to
close the Calibration/Test menu.
DigitalFlow™ XGM868i Service Manual
analog outputs may be used for the calibration. During the analog input
Slot 0
is identical to calibrating
Inputs B, C or D
. Refer to Figure 4 on page 12 for the correct pin numbers.
J2
Appendix B. Calibration and Testing with PanaView
analog output (or independent calibrated current source) to
Slot 0
and
IN(+)
RTN(-)
Input A
. However, be sure to reconnect the current
Input A
Slot 1
. This option card
analog output calibration
Slot 0
pins for
on terminal block J2.
Input A
will be used as an example in this
47