Accuracy; Analog Input Dc Voltage Measurement Accuracy; Dynamic Performance; Noise Performance - Measurement Computing USB-1808X-OEM User Manual

USB-1808X-OEM User's Guide

Accuracy

Analog input DC voltage measurement accuracy

Table 2. DC accuracy components and specifications. All values are (±)
Gain error
(% of
Range reading)
±10 V 0.020
±5 V 0.020
0 V to 10 V 0.020
0 V to 5 V 0.020

Dynamic performance

Range
±10 V
±5 V
0 V to 10 V
0 V to 5 V

Noise performance

For the peak-to-peak noise distribution test, a differential input channel is connected to AGND at the input
terminal block, and 32,000 samples are acquired at the maximum rate available at each setting.
Range
±10 V
±5 V
0 V to 10 V
0 V to 5 V
Offset error INL error
(mV) (% of range)
1.5 0.00076
1.0 0.00057
1.5 0.00028
1.0 0.00014
Table 3. Dynamic performance specifications
Condition
Signal-to-noise ratio (SNR)
Signal-to-noise-and-distortion ratio
(SINAD)
Total harmonic distortion (THD)
Spurious free dynamic range (SFDR)
Effective number of bits (ENOB)
SNR
SINAD
THD
SFDR
ENOB
SNR
SINAD
THD
SFDR
ENOB
SNR
SINAD
THD
SFDR
ENOB
Table 4. Noise performance specifications
Counts
11.6
18.0
23.3
36.1
19
Absolute Gain
accuracy at temperature
Full Scale coefficient
(mV) (% reading/°C)
3.576 0.00023
2.028 0.00023
3.528 0.00023
2.007 0.00023
Specification
94 dB
94 dB
–108 dB
112 dB
15.3 bits
91 dB
91 dB
–105 dB
107 dB
14.8 bits
87 dB
87 dB
–104 dB
109 dB
14.5 bits
83 dB
83 dB
–103 dB
103 dB
13.6 bits
LSBrms
1.77
2.73
3.54
5.47
Specifications
Offset
temperature
coefficient
(µV/°C)
4
4
4
4