Panametrics DigitalFlow XMT868i, Руководство по обслуживанию, Страница: 55 / 74

DigitalFlow™ XMT868i Service Manual 21
Appendix B. Calibration and Testing with PanaView
1. From the Calibration/Test menu (see Figure 11 on page 20), double-click on the Calibration entry to open the
option.
2. In the center pane, double-click on Slot 0.
Note: The Slot 1 option only appears in the center pane if an option card has been installed in this slot.Double-click
on either Output A or Output B to open the Analog Output menu. ( Output A will be used as an example in this
manual.)
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 12 on page 20
for the correct pin numbers.
3. Double-click on 4 milliamps to calibrate the low end of the output range.
4. Double-click on 4 mA UP or 4 mA DOWN to adjust the ammeter reading UP or DOWN, until a 4 mA reading is
achieved, or
Double-click on 4 mA Numer, and directly enter the mA reading in the right pane.
5. Once you have achieved a 4 mA reading, double-click on either 4 mA STORE to store the calibration, or on 4 mA
ABORT to exit the menu without storing the calibration.
Note: If the ammeter reading cannot be adjusted within 5.0  A of the 4 or 20 mA setting, contact the factory for
assistance.
6. PanaView returns to the Analog Output window. Double-click on 20 milliamps , and repeat steps 5 and 6 to cali -
brate 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.
7. Double-click on % Test to test the linearity of the currently selected analog output.
8. Check the ammeter reading at 50% output . Then, enter a different output (0-100%) and double-click on percent .
Check the ammeter reading at this setting and click [Exit Page] when done.
Table 8 on page 21 lists the expected ammeter readings at various % Full Scale settings, for both 4-20 mA and
0-20 mA scales. Refer to this table to verify the accuracy of the ammeter readings taken above.
If the linearity test readings are not within 5  A of the values listed in Table 8, check the accuracy and wiring of the
ammeter. Then, repeat the low and high end calibrations. If the analog output still does not pass the linearity test,
contact the factory for assistance.
9. Double-click on Exit Function to return to the Calibration menu. Then choose another output to calibrate or click
on [Exit Page] to leave the Calibration/Test menu.
This completes calibration of the Slot 0 analog outputs. Proceed to the appropriate section to calibrate additional
inputs/outputs.
Table 8: Expected Ammeter Readings
% Full Scale 4-20 mA Scale* 0-20 mA Scale*
0 4.000 0.000
10 5.600 2.000
20 7.200 4.000
30 8.800 6.000
40 10.400 8.000
50 12.000 10.000
60 13.600 12.000
70 15.200 14.000
80 16.800 16.000
90 18.400 18.000
100 20.000 20.000
* all ammeter readings should be ±0.005 mA