1.3 Calibrating and testing the analog outputs
Every XGF868i flowmeter includes two built-in analog
outputs (A and B) at terminal block J1, which is designated
as slot 0. Additional analog outputs may be added to the
Model XGF868i by installing an appropriate option card in
slot 1. This option card contains two analog outputs, which
are also designated as A and B.
Before beginning calibration, an ammeter must be
connected to the desired analog output. Both the
zero-point and full-scale values for all of these outputs
must be calibrated. After calibrating the outputs, which
have a resolution of 5.0 µA (0.03% full scale), their linearity
should be tested.
NOTE: The zero point of the analog output may be set at
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.
1.3.1 Preparing for calibration
Prepare for calibration by inserting an ammeter in series
with the load on the desired output. Refer to Figure 1
below and Figure 4 on page 8 to identify the OUT(+)
and RTN(-) pins for the desired output.
ENTERESCAPE
DigitalFlow™ XGF868i
Figure 1: Ammeter connection (output A)
1.3.2 Calibrating the low end of the
output range
1. From the keypad program, press the right arrow key to
scroll to the calib menu. Press [enter].
2. In the cal menu, scroll to the slot 0 or slot 1 option, and
press [enter].
NOTE: The slot 1 option only appears in the menu if an option
card has been installed in this slot.
3. Scroll to either output A or output B to open the analog
output menu. (Output A will be used as an example in this
manual.) Press [enter].
IMPORTANT
The procedure for calibrating output B is identical to that
for calibrating output A. However, when calibrating output
B, be sure to reconnect the ammeter on terminal block J1.
See Figure 1 on page 2 for the correct pin numbers.
4. Scroll to 4 mA to calibrate the low end of the output
range. Press [enter].
5. Scroll to UP or DOWN to adjust the ammeter reading
UP or DOWN, until a 4 mA reading is achieved,
or
scroll to numer, and directly enter the mA reading.
In either case, press [enter] to confirm the entry.
6. Once you have achieved a 4 mA reading, scroll to
either store to store the calibration, or to abort
to exit the menu without storing the calibration.
In either case, press [enter].
NOTE: If the ammeter reading cannot be adjusted
within 5.0 µA of the 4 or 20 mA setting, contact the
factory for assistance.
1.3.3 Calibrating the high end of the
output range
1. The XGF868i returns to the analog output window.
Scroll to 20 mA, and repeat steps 4 and 5 to calibrate
the high end of the output range.
NOTE: Skip the following prompt, if linearity testing of the
output will not be performed at this time.
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