NI 9144 User Guide and Specifications
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© National Instruments
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45
NI 9215
The vendor configuration extensions for the NI 9215 are listed in Table 39.
NI 9215 Calibration Data
The NI 9215 has four channels with a nominal range of ±10.4 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 NI 9215 EEPROM stores these two constants for each channel. The host can then take these
constants and adjust the raw data into calibrated data.
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.
Table 39.
NI 9215 Vendor Configuration Extensions
Index
Sub
Type
R/W
Description
0x2100
0
ARR:U32
—
Calibration = 16
1
R
Ch0 Offset
2
R
Ch0 Gain
...
—
—
7
R
Ch3 Offset
8
R
Ch3 Gain
9
R
External Calibration, Ch0
Offset
...
—
—
Table 40.
NI 9215 Calibration Coefficients
Coefficient
Representation
Units
LSB Weight
Unsigned
nV/LSB
Offset
Signed
nV