Accuracy, Analog input drift, Noise performance – Measurement Computing PCIM-DAS16JR/16 User Manual
Page 22: Accuracy -2, Analog input drift -2, Noise performance -2
PCIM-DAS16JR/16 User's Guide
Specifications
Accuracy
Typical accuracy
±2.3 LSB
Absolute accuracy
±5.0 LSB
Accuracy components
Gain Error
Trimmable by potentiometer to 0
Offset Error
Trimmable by potentiometer to 0
PGA linearity error
±1.3 LSB typ., ±10.0 LSB max.
Integral Linearity Error
±0.5 LSB typ., ±3.0 LSB max.
Differential Linearity Error
±0.5 LSB typ., ±2.0 LSB max.
Each PCIM-DAS16JR/16 is tested at the factory to ensure the board’s overall accuracy error does not exceed
±5 LSB. Total board error is a combination of gain, offset, differential linearity and integral linearity error. The
theoretical absolute accuracy of the board may be calculated by summing these component errors. Worst case
error is realized only in the unlikely event that each of the component errors are at their maximum level, and
causing error in the same direction.
Analog input drift
Range Analog
Input
Full-Scale
Gain drift
Analog Input Zero drift
Overall Analog Input drift
±10.00 V
2.2 LSB/°C max.
1.8 LSB/°C max.
4.0 LSB/°C max.
±5.000 V
2.2 LSB/°C max.
1.9 LSB/°C max.
4.1 LSB/°C max.
±2.500 V
2.2 LSB/°C max.
2.0 LSB/°C max.
4.2 LSB/°C max.
±1.250 V
2.2 LSB/°C max.
2.3 LSB/°C max.
4.5 LSB/°C max.
0 - 10.00 V
4.1 LSB/°C max.
1.9 LSB/°C max.
6.0 LSB/°C max.
0 - 5.000 V
4.1 LSB/°C max.
2.1 LSB/°C max.
6.2 LSB/°C max.
0 - 2.500 V
4.1 LSB/°C max.
2.4 LSB/°C max.
6.5 LSB/°C max.
0 - 1.250 V
4.1 LSB/°C max.
3.0 LSB/°C max.
7.1 LSB/°C max.
Absolute error change per °C temperature change is a combination of the gain and offset drift of many
components. The theoretical worst case error of the board may be calculated by summing these component
errors. Worst case error is realized only in the unlikely event that each of the component errors are at their
maximum level, and are causing error in the same direction.
Noise performance
The following table summarizes the worst case noise performance for the PCIM-DAS16JR/16. Noise
distribution is determined by gathering 50000 samples with inputs tied to ground at the PCIM-DAS16JR/16
main connector. Data represents both single-ended and differential modes of operation.
Range LSBrms
Typical
Counts
±10.00 V
1.30
12
±5.000 V
1.30
12
±2.500 V
1.30
12
±1.250 V
1.30
13
0 - 10.00 V
1.80
15
0 - 5.000 V
1.80
15
0 - 2.500 V
1.80
15
0 - 1.250 V
1.80
16
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