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USB-TEMP-AI User's Guide Specifications

Absolute Accuracy: V0x-V3x

Table 9. Calibrated absolute accuracy specifications

Range

Absolute Accuracy

(mV)

±10 V

±2.779

±5 V

±1.398

±2.5 V

±0.707

±1.25 V

±0.362

Note 15: When connecting differential inputs to floating input sources, the user must provide a ground

return path from each differential input to ground. To do this, simply connect a resistor from each of

the differential inputs to GND. A value of approximately 1 M Ω can be used for most applications.

Note 16: All ground pins are common and are isolated from earth ground. If a connection is made to earth

ground when using both voltage inputs and conductive thermocouples, the thermocouples are no

longer isolated. In this case, thermocouples must not be connected to any conductive surfaces that may

be referenced to earth ground

Note 17: Unused voltage inputs should not be left floating. These inputs should be placed in the Disabled

mode or connected to GND.

Table 10. Accuracy components. All values are (±)

Range

Gain error

(% of reading)

Offset

error

(µV)

INL error

(% of range)

Gain

Temperature

Coefficient

(ppm/°C)

Offset Temperature

Coefficient

(µV/°C)

±10 V

0.0246

16.75

0.0015

3.68

0.42

±5 V

0.0246

16.75

0.0015

3.68

0.42

±2.5 V

0.0246

16.75

0.0015

3.68

0.42

±1.25 V

0.0246

16.75

0.0015

3.68

0.42

Table 11. Noise performance specifications

Range

Peak to peak noise

(µV)

RMS noise

(µVrms)

Noise-Free resolution

(bits)

±10 V

41.13

6.23

19.09

±5 V

30.85

4.67

18.51

±2.5 V

17.14

2.60

18.36

±1.25 V

11.14

1.69

17.98

Table 11 summarizes the noise performance for the device. Noise distribution is determined by gathering

1000 samples with inputs tied to ground at the user connector. Samples are gathered at the maximum specified

sample rate of 2 S/s.

Settling time: V0x-V3x

Table 12. Settling time specifications

Range

Accuracy

±0.0004%

(seconds)

±10 V

15.0

±5 V

0.40

±2.5 V

0.40

±1.25 V

0.40

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