NI-9264 Vendor Configuration Extensions

The following table lists the vendor configuration extensions for the NI-9264.

Table 99. NI-9264 Vendor Configuration Extensions
Index Sub Type R/W Description
0x2100 0 ARR:U32 — Calibration = 64
1 R Ch0 Offset
2 R Ch0 Gain
3 R Ch1 Offset
... — —
32 R Ch16
33 R External Ch0 Offset
... — —

NI-9264 Calibration Data

The NI-9264 has 16 channels with a nominal range of ±10.5 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.

Table 100. NI-9264 Scan List Format
Coefficient Representation Units
LSB Weight Unsigned pV/LSB
Offset Signed nV

Use the calibration coefficients with the following equation to generate corrected data.

Figure 33. NI-9264 Corrected Data Equation
V desired ( Code ) = Code × LSB weight ( nV bits ) × 10 − 9 ( V nV ) +   Offset ( nV ) × 10 − 9 ( V nV ) V desired ( Code ) = Code × LSB weight ( nV bits ) × 10 − 9 ( V nV ) +   Offset ( nV ) × 10 − 9 ( V nV )

where Code represents the code returned by the NI-9264 and Vdesired represents the corrected voltage value.