
NI 9144 User Guide and Specifications 38 ni.com
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
correct data:
Rraw(bits) = data returned by the NI 9217 in bits
Rcorrected = calibrated resistance reading
NI 9219Table 31. NI 9217 Calibration Coefficients
Coefficient Representation Units
LSB Weight Unsigned pΩ/LSB
Offset Signed μΩ
Table 32. NI 9219 Vendor Configuration Extensions
Index Sub Type R/W Description
0x2001 0 ARR:U32 —Command List = 33
1 R Command Count = 1..32, default = 32
2..33 R/W Configuration Command
0x2002 1 ARR:U32 RError Status
0x2005 0 U32 R/W ADC Format
Rcorrected Rraw
()Rraw bits()
∗LSBweight
pΩ
bits
---------
⎝⎠
⎛⎞
∗10 12–Ω
pΩ
-------
⎝⎠
⎛⎞
⎩⎭
⎨⎬
⎧⎫
Offset μΩ()
∗10 6–Ω
μΩ
--------
⎝⎠
⎛⎞
–=