ADLINK DAQe-2502 - Manual (Page 70)

60 Calibration
5.2 Auto-calibration
Through the DAQ-/DAQe-/PXI-2502/2501 card auto-calibration
feature, the calibration software measures and corrects almost all
calibration errors without any external signal connections, refer-
ence voltage, or measurement devices.
The DAQ-/DAQe-/PXI-2502/2501 card comes with an onboard
calibration reference to ensure the accuracy of auto-calibration.
The reference voltage is measured in the production line through a
digital potentiometer and compensated in the software. The cali-
bration constant is memorized after this measurement. We do not
recommended adjustment of the onboard calibration reference
except when an ultra-precision calibrator is available.
NOTES
• Warm the card up for at least 15 minutes before initiating auto-cal-
ibration.
• Remove the cable before auto-calibrating the card since the DA
outputs are changed during the process.
5.3 Saving Calibration Constants
When auto-calibration is completed, you can save the new calibra-
tion constants to the user-configurable banks in the EEPROM.
The date and the temperature when you ran auto-calibration is
saved with the calibration constants. You can store three sets of
calibration constants according to three different environments
and re-load the calibration constants later. for users to save cali-
bration constants in an easy manner.