National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Instrukcja Użytkownika Pobierz pdf (Strona 41)

The calibration data is stored in a U32 array, though each Offset field

should be interpreted as a signed value.

The NI 9219 returns calibrated 24-bit (padded to 32-bits) AI data for all

modes and ranges.

To convert raw data into engineering units use the following formula:

y = m*x + b

• b = offset based on range of the device (such as, –60 for ± 60 Volts

Voltage Measurement Range)

• m = Gain (Full-Range/ (2

)): (such as, 120/(2

) for ± 60 Volts Voltage

Measurement Range)

14 3-Wire RTD Pt1000

15 Pt100

16 Quarter-Bridge 350 Ω

17 120 Ω

18 Half-Bridge ±500 mV/V

19 Reserved —

20 Full-Bridge ±62.5 mV/V

21 ±7.8 mV/V

Table 35. NI 9219 Calibration Data

Coefficient Representation

LSB Weight Unsigned

Offset Signed

Table 34. NI 9219 Channel Calibration (Continued)

Entry

Number

Mode Range

1 2 ... 36 37 38 39 40 41 42 43 44 45 46 ... 64 65

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National Instruments Deterministic Ethernet Expansion Chassis NI 9144 Instrukcja Użytkownika Strona 41