Programming instructions

Chapter 22 SCXI Calibration—Increasing Signal Measurement Precision
LabVIEW Data Acquisition Basics Manual 22-2
© National Instruments Corporation
• The factory area has a set of factory calibration constants already
stored in it when you receive your SCXI module. You cannot write into
the factory area, but you can read from it, so you can always access and
use these factory constants if they are appropriate for your application.
• The default load area is where LabVIEW automatically looks to load
calibration constants the first time you access the module. When the
module is shipped, the default load area contains a copy of the factory
calibration constants.
Note
You may overwrite the constants stored in the default load area of EEPROM with
a new set of constants using the SCXI Cal Constants VI. To learn more about this
VI, refer to Chapter 29, Calibration and Configuration VIs, in the LabVIEW
Function and VI Reference Manual, or refer to the LabVIEW Online Reference, by
selecting Help»Online Reference….
• The user area is an area for you to store your own calibration constants
that you calculate using the SCXI Cal Constants VI. You can also put
a copy of your own constants in the default load area if you want
LabVIEW to automatically load your constants for subsequent
operations. You can read and write to the user area.
Note
You should use the user area in EEPROM to store any calibration constants that
you may need to use later. This safeguards you from accidentally overwriting your
constants in the default load area, because you will have two copies of your new
constants and you can revert to the factory constants by copying the factory area
to the default load area without wiping out your new constants entirely.
Electronically Erasable Programmable Read-Only Memory
(EEPROM)
Factory
Area
Default Load
Area
User
Area