National Instruments SCXI -1125 用户手册
SCXI-1125 Calibration Procedure
4
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Setting Up Your Module
Complete the following steps to set up your module for testing:
1.
Install the SCXI-1125 in slot 1 of the SCXI chassis.
2.
Connect a 68-to-68-pin cable between the SCXI module and the
E Series DAQ device installed in the host computer.
E Series DAQ device installed in the host computer.
3.
Configure the hardware with Measurement & Automation Explorer
(MAX). For more information on configuring the system, refer to the
E Series device and SCXI module documentation.
(MAX). For more information on configuring the system, refer to the
E Series device and SCXI module documentation.
Verifying Gain and Offset Errors
The verification procedure determines how well the SCXI-1125 module is
meeting its specifications. You can use this information to select the
appropriate calibration interval for your application.
meeting its specifications. You can use this information to select the
appropriate calibration interval for your application.
Complete the following steps to verify gain and offset errors in the
SCXI-1125:
SCXI-1125:
1.
Read the
section earlier in this document.
2.
Refer to the specifications in Table 1 at the end of this document.
3.
Connect the E Series device to the SCXI-1125.
4.
Call
Calibrate_E_Series
to minimize the uncertainty associated
with the E Series device measurements. Set the following parameters:
•
deviceNumber—The value assigned by MAX
•
calOp—
ND_SELF_CALIBRATE
•
setOfCalConstants—
ND_USER_EEPROM_AREA
•
calRefVolts—0.0
5.
Call
AI_Configure
to put the E Series device in bipolar mode. Set the
following parameters:
•
deviceNumber—The value assigned by MAX
•
chan—0
•
inputMode—0
•
inputRange—0
•
polarity—0
•
driveAIS—0
6.
Call
MIO_Config
to enable dithering on the E Series device. Set the
following parameters:
•
deviceNumber—The value assigned by MAX
•
dither—1
•
useAMUX—0