Brand： National Instruments Model number：PXI-5670
Colour：new Warranty: 12 months
Lead Time：3-day working day Country of origin: USA
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PXI-5670 National Instruments Spare parts in stock
AI Absolute Accuracy Equation
AbsoluteAccuracy = Reading · (GainError) + Range · (OffsetError) + NoiseUncertainty
GainError = ResidualAIGainError + GainTempco · (TempChangeFromLastInternalCal)
+ ReferenceTempco · (TempChangeFromLastExternalCal)
OffsetError = ResidualAIOffsetError + OffsetTempco ·
(TempChangeFromLastInternalCal) + INLError
NoiseUncertainty =
Random Noise ڄ 3
100 for a coverage factor of 3 σ and averaging
100 points.
AI Absolute Accuracy Example
Absolute accuracy at full scale on the analog input channels is determined using the following
assumptions:
• TempChangeFromLastExternalCal = 10 °C
• TempChangeFromLastInternalCal = 1 °C
• number_of_readings = 100
• CoverageFactor = 3 σ
For example, on the 10 V range, the absolute accuracy at full scale is as follows:
GainError = 75 ppm + 25 ppm · 1 + 5 ppm · 10 = 150 ppm
OffsetError = 20 ppm + 57 ppm · 1 + 76 ppm = 153 ppm
NoiseUncertainty = 244 µ
100
ڄ ܸ
3
= 73 µV
AbsoluteAccuracy = 10 V · (GainError) + 10 V · (OffsetError) + NoiseUncertainty =
3,100 µV
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