Adlink PCI-9524 Manual do Utilizador descarregar pdf (Página 89)

Calibration 73

ADLINK Technology Inc. PCI-9524

5 Calibration

This chapter introduces the calibration process to minimize AD

measurement errors and DA output errors.

5.1 Loading Calibration Constants

The PCI-9524 is factory calibrated before shipment by writing the

associated calibration constants of TrimDACs firmware to the on-

board EEPROM. TrimDACs firmware is the algorithm in the

FPGA. Loading calibration constants is the process of loading the

values of TrimDACs firmware stored in the on-board EEPROM.

ADKLINK provides a software utility for reading the calibration

constants automatically if necessary.

There is a dedicated space for storing calibration constants in the

EEPROM. In addition to the default bank of factory calibration con-

stants, there are three more user-utilization banks. That means

users can load TrimDAC firmware values either from the original

factory calibration or from a calibration that is subsequently per-

formed.

Because errors in measurements and outputs will vary with time

and temperature, it is recommended to re-calibrate when the card

is installed in the user's environment. The auto-calibration function

used to minimize errors will be introduced in the next sub-section.

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Adlink PCI-9524 Manual do Utilizador Página 89