Absolute accuracy: v0x-v3x, Settling time: v0x-v3x – Measurement Computing USB-TEMP-AI User Manual
Page 24
USB-TEMP-AI User's Guide
Specifications
24
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