PXI-6221 National Instruments

Absolute accuracy at full-scale numbers is valid immediately following internal calibration

and assumes the device is operating within 10 °C of the last external calibration.

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

Analog Output

Number of channels 2

DAC resolution 16 bits

DNL ±1 LSB

Monotonicity 16 bit guaranteed

Maximum update rate

1 channel 833 kS/s

2 channels 740 kS/s per channel

Timing accuracy 50 ppm of sample rate

Timing resolution 50 ns

Output range ±10 V

PXI-6120  

PXIE-6366

PXI-6289

PXIE-7961R

PCI-8517

PXI-2545

PXI-7952R

PXI-6723

PCI-6031E

PXIE-7962R

CDAQ-9171

PXIE-1095

PCI-4474

PXI-6115

PXI-2596

PXI-6515

PCIE-8381

PXIE-1082

PXIE-8135

PXIE-7976R

NI-5791

PXI-6224

CDAQ-9181

PXI-2597

PCI-6224

PXI-8331

NI-9250

PXI-6238

PXIE-6358

You are welcome to make an inquiry

E-mail:

free@fenoux.com

Tel.:

+8618030177860

Skype:

+86 18030177860

WhatsApp:

+86 18030177860