NI sbRIO-961x/9612XT/963x/9632XT/964x/9642XT
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Accuracy details
Absolute accuracy formulas
AbsoluteAccuracy
=
Reading
·
GainError
+
Range
·
OffsetError
+
NoiseUncertainty
GainError
=
ResidualGainError
+
GainTempco
·
TempChangeFromLastInternalCal
+
ReferenceTempco
·
TempChangeFromLastExternalCal
OffsetError
=
ResidualOffsetError
+
OffsetTempco
·
TempChangeFromLastInternalCal
+
INL_Error
NoiseUncertainty =
(
RandomNoise ·
3) /
for a coverage factor of 3
σ
and averaging 100 points.
Absolute accuracy at full scale on the analog input channels is determined
using the following assumptions:
TempChangeFromLastExternalCal =
45 °C
TempChangeFromLastInternalCal =
5 °C
NumberOfReadings =
100
CoverageFactor =
3
σ
For example, on the 10 V range, the absolute accuracy at full scale is as
follows:
GainError
= 94 ppm + 23 ppm · 5 + 5 ppm · 45
GainError
= 434 ppm
OffsetError
= 20 ppm + 49 ppm · 5 + 76 ppm
OffsetError
= 341 ppm
Nominal
Range (V)
Residual
Gain
Error
(ppm of
Reading)
Gain
Tempco
(ppm/°C)
Reference
Tempco
Residual
Offset Error
(ppm of
Range)
Offset
Tempco
(ppm of
Range/°C)
INL Error
(ppm of
Range)
±10
94
23
5
20
49
76
±5
104
23
5
20
50
76
±1
114
23
5
25
62
76
±0.2
154
23
5
40
118
76
100
