Measurement Computing Data Translation DT3034, User Manual

Page: 129 / 178

Chapter 8
128
4. In the Reference Source box, select the reference that you are using ( Internal or External ;
Internal is the default).
5. In the Auto Calibration box, click Go .
The bipolar (zero and full-scale) and unipolar (zero and full-scale) ranges are automatically
calibrated, and the calibration values are displayed. The bipolar readings should be within 0.001 V;
the unipolar readings should be within 0.0005 V.
6. Click OK .
7. In the Range box, select PGH Zero .
8. If the displayed value is not 0.0000 V (within 0.001 V), continue with “Calibrating the
PGH Zero Setting” on page 129 ; otherwise, click Quit when you are finished calibrating
the analog input circuitry.
Once you have finished this procedure, continue with “Calibrating the Analog Output
Subsystem” on page 130 .
Note: If you are not satisfied with the analog input calibration, you can load the factory
default settings stored in the EEPROM by clicking Restore in the Factory Settings box.
Using the Manual Calibration Procedure
If you want to manually calibrate the analog input circuitry instead of auto-calibrating it, do
the following:
1. From the main menu of the DT3034 Calibration Utility, click Configure , and then Board .
2. Select the name of the DT3034 board to configure from the combo box, and then click OK .
3. From the main menu of the DT3034 Calibration Utility, click Calibrate.
4. Click A/D .
5. In the Reference Source box, select the reference that you are using ( Internal or External ;
Internal is the default).
6. In the Range box, select Bipolar , and then Zero .
7. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads 0.0000 V (within 0.001 V).
8. In the Range box, select Bipolar , and then +FS (for full-scale).
9. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads 5 V with the internal reference or +9.3750 V with the external reference (within
0.001 V).
10. In the Range box, select Unipolar , and then +FS (for full-scale).
11. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads 5 V with the internal reference or +9.3750 V with the external reference (within
0.0005 V).
12. In the Range box, select Unipolar , and then Zero .