Deterministic Ethernet Expansion Chassis User's Guide

© National Instruments Corporation 27 NI 9144 User Guide and Specifications
The calibration data is stored in a U32 array, though each offset field should
be interpreted as a signed value.
Use the calibration coefficients with the following equation to generate
corrected data:
Table 12. NI 9203 Calibration Coefficients
Coefficient Representation Units
LSB Weight Unsigned pA/LSB
Offset Signed pA
Table 13. NI 9203 Calibration Equation Information
Term Units Definition
I
corrected
pA Calibrated current
I
raw
bits The raw code from the
NI 9203
I
expected0mA
bits Expected code at 0 mA.
0 bits for 0–20 mA range.
32768 bits for ±20 mA
range
LSB
weight
pA/bit Number of pA in one bit
I
offset
pA Offset at 0 mA
I
corrected
I
raw
() I
raw
I
expected 0mA
–
∗
LSB
weight
I
offset
–=
pA bits pA/bit pA
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