ADLINK DAQe-2214 - Manual (Page 91)

Calibration 79
5 Calibration
This chapter introduces the calibration process to minimize AD
measurement errors and DA output errors.
5.1 Loading Calibration Constants
The DAQ-/DAQe-2213/2214 card is factory-calibrated before ship-
ment. The associated calibration constants of the TrimDACs firm-
ware to the onboard EEPROM. TrimDACs are devices containing
multiple DACs within a single package. TrimDACs do not have
memory capability. That means the calibration constants do not
retain their values after the system power is turned off. Loading
calibration constants is the process of loading the values of Trim-
DACs firmware stored in the onboard EEPROM. ADLINK provides
a software utility that automatically reads 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 is one user-utilization bank. This bank allows you to
load the TrimDACs firmware values either from the original factory
calibration or from a subsequently-performed calibration.
Because of the fact that measurements and outputs errors may
vary depending on time and temperature, it is recommended that
you calibrate the card when it is integrated in your computing envi-
ronment. The auto-calibration function is presented in the follow-
ing sections.