Adlink DAQe-2502 Manual do Utilizador descarregar pdf (Página 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.

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