Accuracy, Noise performance, Analog input calibration – Measurement Computing USB-2020 User Manual
Page 19
USB-2020 User's Guide
Specifications
Accuracy
Table 2. DC Accuracy components and specifications. All values are (±)
Range
Gain error
(% of reading)
Offset error
(mV)
INL error
(% of range)
Absolute
accuracy at
Full Scale
(mV)
Gain
temperature
coefficient
(% reading/°C)
Offset
temperature
coefficient
(µV/°C)
±10 V
0.11
5.2
0.0976
35.72
0.0035
30
±5 V
0.11
5.2
0.0488
20.46
0.0035
110
±2 V
0.11
1.1
0.0244
8.18
0.0035
10
±1 V
0.11
1.1
0.0122
4.64
0.0035
25
Noise performance
For the peak-to-peak noise distribution test, a single-ended input channel is connected to AGND at the input
BNC connector and 20,000 data samples are acquired at the maximum rate.
Table 3. Noise performance specifications
Range
Counts
LSBrms
±10 V
5
0.76
±5 V
5
0.76
±2 V
7
1.06
±1 V
7
1.06
Analog input calibration
Table 4. Analog input calibration specifications
Parameter
Specification
Recommended warm-up time 15 minutes min.
Calibration method
Self calibration, with calibration factors for each range stored onboard in non-volatile
memory
Calibration interval
1 year (factory calibration)
19