ADLINK PXI-9527 - Manual (Page 47)

Calibration 37
PXI-9527
4 Calibration
This chapter introduces the calibration process to minimize analog
input measurement errors and analog output errors.
4.1 Calibration Constant
The PXI-9527 is factory calibrated before shipment, with associ-
ated calibration constants written to the onboard EEPROM. At
system boot, the PXI-9527 driver loads these calibration con-
stants, such that analog input path and analog output circuit errors
are minimized. ADLINK provides a software API for calibrating the
PXI-9527.
The onboard EEPROM provides three banks for calibration con-
stant storage. Bank 0, the default bank, records the factory cali-
brated constants, providing written protection preventing
erroneous auto-calibration. Banks 1 and 2, user-defined space,
are provided for storage of self-calibration constants. Upon execu-
tion of auto-calibration, the calibration constants are recorded to
bank 1 or 2 based on user assignment.
When PXI-9527 boots, the driver accesses the calibration con-
stants and is automatically set to hardware. In the absence of user
assignment, the driver loads constants stored in bank 0. If con-
stants from bank 1 or 2 are to be loaded, the preferred bank can
be designated as boot bank by software. Following re-assignment
of the bank, the driver will load the desired constants on system
re-boot. This setting is recorded to EEPROM and is retained until
re-configuration.