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National Instruments Corporation
25
NI WSN-3202 User Guide and Specifications
Specifications
The following specifications are typical for the range –40 to 70 °C unless otherwise noted.
For the NI WSN gateway specifications, refer to the gateway documentation.
Analog Input Characteristics
Number of channels ...............................................4 single-ended
ADC resolution ......................................................16 bits
DNL .......................................................................No missing codes guaranteed
INL.........................................................................Refer to the
section
Minimum sample interval ......................................1 s
Input coupling ........................................................DC
Nominal input ranges.............................................±10 V, ±5 V, ±2 V, ±0.5 V
Minimum over range..............................................4%
Input impedance (at DC)
Powered on.....................................................>1 G
Powered off/overload .....................................10 k
Input bias current ...................................................3 nA
Crosstalk (at 1 kHz)
Adjacent channels ..........................................>100 dB
Non-adjacent channels ...................................>100 dB
Analog bandwidth..................................................7 kHz
Overvoltage protection...........................................±30 V (one channel only)
Note
The values in the following tables are based on calibrated scaling coefficients, which are
stored in the onboard EEPROM.
AI Absolute Table Accuracy Summary
Nominal Range
(V)
Maximum Absolute
Accuracy (mV)
*
–40 to 70
°
C
Typical Absolute
Accuracy (mV)
*
25
° ±
5
°
C
Random Noise
(
Vrms)
Sensitivity
†
(
V)
±10
38.21
3.70
342
137
±5
22.91
2.40
172
68.5
±2
10.52
1.49
69
27.5
±0.5
2.69
0.29
18
7
*
Absolute accuracy values at full scale on the analog input channels computed using the specified temperature range and are
valid for averaging 100 samples immediately following calibration. Refer to the
for more
information.
†
Sensitivity is the smallest voltage change that can be detected. It is a function of noise.
