NI WSN-3202 User Guide and Specifications
26
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AI Absolute Accuracy Details (Maximum Values)
Absolute Accuracy Formulas
Sensor Power
Voltage
Typical (10 mA) .............................................12.6 V
Minimum .......................................................11.5 V
Maximum.......................................................13.35 V
Output Current .......................................................17 mA maximum at –40 to 70 °C,
20 mA maximum at 25 °C
Delay from sensor power active
to measurement ......................................................0 ms, 25 ms, 100 ms, 200 ms,
always ON
Nominal
Range (V)
Residual
Gain Error
(ppm of
Reading)
Gain
Tempco
(ppm/
°
C)
Residual
Offset Error
(ppm of Range)
Offset Tempco
(ppm of
Range/°C)
INL Error
(ppm of Range)
±10
102
31
164
22
100
±5
137
41
240
22
100
±2
182
48
420
22
100
±0.5
160
50
300
24
100
AbsoluteAccuracy = Reading · Gai Range · Offse NoiseUncertainty
GainError = ResidualGai GainTempco · TempChangeFromLastCal
OffsetError = ResidualOffse OffsetTempco · TempChangeFromL INL_Error
NoiseUncertainty
= (3 ·
RandomNoise
)/
for a coverage factor of 3
and averaging
100 points
Absolute accuracy at full scale on the analog input channels is determined using the following assumptions:
TempChangeFromLastCal
= 45 °C
NumberOfReadings
= 100
CoverageFactor
= 3
For example, on the 10 V range, the absolute accuracy at full scale is as follows:
GainError
=
10 V
·
(102 ppm + 31 ppm
·
45) = 14.97 mV
OffsetError =
10 V
·
(164 ppm + 22 ppm
·
45 + 100 ppm) = 12.54 mV
NoiseUncertainty =
3
·
342
V
=
0.103 mV
AbsoluteAccuracy =
27.61 mV
NumberofReadings
