Programming instructions

© National Instruments Corporation 22-1 LabVIEW Data Acquisition Basics Manual
22
SCXI Calibration—Increasing
Signal Measurement Precision
Your SCXI module ships to you pre-calibrated for the specified accuracy
at the factory. You only need to recalibrate the module if the precision of
your signal measurement is not acceptable because of shifts in
environmental conditions.
Before learning about how to calibrate, you should understand where
LabVIEW stores your calibration constants.
Note
This chapter does not apply to the SCXI-1200. For calibration on the SCXI-1200,
you should use the 1200 Calibrate VI, which you can find in Functions»Data
Acquisition»Calibration and Configuration. If you are using an SCXI-1200 in a
Remote SCXI configuration, National Instruments recommends that you connect
directly to your parallel port to perform calibration, because it works much faster.
EEPROM—Your System’s Holding Tank for
Calibration Constants
When you calibrate your SCXI module in LabVIEW, the calibration
constants can be stored in
Electronically Erasable Programmable
Read-Only Memory
(
EEPROM
). EEPROM could be compared to a holding
tank for calibration constant information in your module’s memory. There
are 3 parts to this holding tank: the
factory area
, the
default load area
, and
the
user area
, shown in the following diagram.
Note
Only the SCXI-1122, SCXI-1124, SCXI-1102, and SCXI-1141 have EEPROMs.
All other SCXI modules do not store calibration constants.