National Instruments NI 9144 User Manual - page 87
NI 9144 User Guide and Specifications
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© National Instruments
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87
The calibration data is stored in a U32 array, though each Offset field (subindex 1, 3, 5, and so
on) should be interpreted as a signed value.
Use the calibration coefficients with the following equation to generate corrected data:
where
Code represents the code returned by the NI 9264
V
desired
represents the corrected voltage value
NI 9265
The vendor configuration extensions for the NI 9265 are listed in Table 96.
NI 9265 Error Status
Each channel has open loop detection circuitry that reports an error whenever the load is
disconnected and the current is set to a value higher than 0 mA. On the cycle after the error is
reported, it is (internally) automatically acknowledged.
Table 95.
NI 9264 Scan List Format
Coefficient
Representation
Units
LSB Weight
Unsigned
pV/LSB
Offset
Signed
nV
Table 96.
NI 9265 Vendor Configuration Extensions
Index
Sub
Type
R/W
Description
0x2002
0
U32
R
Error Status, sent as 8-bit PDO
0x2100
0
ARR:U32
—
Calibration = 16
1
R
Ch0 Offset
2
R
Ch0 Gain
3
R
Ch1 Offset
...
—
—
8
R
Ch3 Gain
9
R
External Ch0 Offset
...
—
—
V
desired
Code
(
)
Code LSB
weight
×
nV
bits
---------
10
9
–
×
V
nV
-------
Offset nV
(
) 10
9
–
V
nV
-------
×
+
=