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OM-USB-TC-AI User's Guide
Absolute accuracy: V0x-V3x
Range
Absolute Accuracy
(mV)
±10 V
±2.779
±5 V
±1.398
±2.5 V
±0.707
±1.25 V
±0.362
Note 8:
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 1Meg ohm can be used for most applications.
All ground pins are common and are isolated from earth ground. If a connection is made to earth
Note 9:
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 10:
Unused voltage inputs should not be left floating. These inputs should be placed in the Disabled
mode or connected to GND.
Range
Gain error
(% of reading)
±10 V
0.0246
±5 V
0.0246
±2.5 V
0.0246
±1.25 V
0.0246
Range
Peak to peak noise
(µV)
±10 V
41.13
±5 V
30.85
±2.5 V
17.14
±1.25 V
11.14
Table 7 summarizes the noise performance for the OM-USB-TC-AI. 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
Range
Accuracy
±0.0004% (seconds)
±10 V
15.0
±5 V
0.40
±2.5 V
0.40
±1.25 V
0.40
Settling time is defined as the time required for a channel to settle within a specified accuracy in response to a
full-scale (FS) step input.
Table 5. Calibrated absolute accuracy specifications
Table 6. Accuracy components. All values are (±)
Offset error
INL error
(µV)
(% of range)
16.75
0.0015
16.75
0.0015
16.75
0.0015
16.75
0.0015
Table 7. Noise performance specifications
RMS noise
(µVrms)
6.23
4.67
2.60
1.69
Table 8. Settling time specifications
20
Gain Temperature
Coefficient
(ppm/°C)
3.68
3.68
3.68
3.68
Noise-Free resolution
(bits)
19.09
18.51
18.36
17.98
Specifications
Offset Temperature
Coefficient
(µV/°C)
0.42
0.42
0.42
0.42
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