National Instruments Deterministic Ethernet Expansion Chassis NI 9144 - Manual (Page 60)

NI 9144 User Guide and Specifications 60 ni.com
NI 9263
NI 9263 Calibration Data
The NI 9263 has four channels with a nominal range of ±10.7 V. Each
channel has an associated LSB weight, which is the number of volts per bit,
and an offset, which is the number of volts per bit measured when the inputs
are grounded.
Note LSB weight is referred to as Gain in the object dictionary.
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:
Table 56. NI 9263 Vendor Configuration Extensions
Index Sub Type R/W Description
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
... ...
Table 57. NI 9263 Scan List Format
Coefficient Representation Units
LSB Weight Unsigned nV/LSB
Offset Signed nV
V
desired
Code ( ) Code LSB
weight
•
nV
bits
---------
⎝ ⎠
⎛ ⎞ 10 9 – •
V
nV
-------
⎝ ⎠
⎛ ⎞ Offset nV
( ) 10
9 –
V
nV
-------
⎝ ⎠
⎛ ⎞
•
+ =