Data Translation DT300 Series, User Manual

Page: 121 / 164

Calibration
121
Note: Calibrating the PGH Zero setting in software is no longer required; the hardware
calibrates this setting automatically.
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
To calibrate the analog input circuitry manually, do the following:
1. From the main menu of the DT300 Series Calibration Utility, click Configure , and then
Board .
2. Select the name of the DT300 Series board to configure from the combo box, and then click
OK .
3. From the main menu of the DT300 Series Calibration Utility, click Calibrate.
4. Click A/D .
5. In the Range box, select Bipolar , and then Zero .
6. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads 0 V (within 0.0001 V for the DT321 and DT322 boards and within 0.0010 V for the
remaining DT300 Series boards).
7. In the Range box, select Bipolar , and then FS (for full-scale).
8. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads +9.3750 V with the external reference (within 0.0001 V for the DT321 and DT322
boards and within 0.0010 V for the remaining DT300 Series boards).
9. In the Range box, select Unipolar , and then Zero .
10. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads 0 V (within 0.0001 V for the DT321 and DT322 boards and within 0.0010 V for the
remaining DT300 Series boards).
11. In the Range box, select Unipolar , and then FS (for full-scale).
12. Click the increment or decrement arrows in the Manual Adjustment box until the display
reads +9.3750 V with the external reference (within 0.0001 V for the DT321 and DT322
boards and within 0.0010 V for the remaining DT300 Series boards).
13. 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 123 .