NI 9144 User Guide and Specifications
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© National Instruments
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41
Table 33 contains the default scan list.
NI 9213 Calibration Data
Calibration data is set up by the driver during initialization. The calibration conversion is
performed on the module ADC itself. The third-party user does not need to check the index
0x2100 to calibrate the data manually.
Use the following equation to calculate raw voltage for the cold-junction compensation (CJC):
where
V
CJCvoltage
represents raw CJC voltage
Bit
CJC
represents binary bits for the CJC
Use the following equation to calculate raw voltage for the thermocouple (TC):
where
V
TCvoltage
represents raw TC voltage
Bit
TC
represents binary bits for the TC
Bit
autozero
represents binary bits returned by the auto zero channel
Table 33.
NI 9213 Scan List Format
Index
Sub
Type
Value
0x2001
0
ARR:U32
19
1
18
2
0
3
1
...
...
18
16
19
17
V
CJCvoltage
78.125
mV
78.125
mV
+
(
)
2
24
-------------------------------------------------------------
Bit
CJC
×
=
V
TCvoltage
78.125
mV
78.125
mV
+
(
)
2
24
-------------------------------------------------------------
Bit
TC
Bit
autozero
–
(
)
×
=
