Multifunction_RIO_Specs.pdf - 第2页
Multifunction Reconfigurable I/O Specifi cations 2 ni.com Input impedance Powered on ...... .......................... .10 G Ω in para llel with 100 pF Powered off/over load .................. 4.0 k Ω min Input signal ra…
Multifunction Reconfigurable I/O
Specifications
(Formerly known as the NI R Series Multifunction RIO Specifications)
This document lists the specifications of the PCI/PXI-7811, PCI/PXI-7813, PCI/PXI-7830, PCI/PXI-7831, PCI/PXI-7833,
PCIe/PXI-7841, PCIe/PXI-7842, PCIe/PXI-7851, PCIe/PXI-7852, PXI-7853, and PXI-7854 devices. These specifications are
typical at 25 °C unless otherwise noted.
Conventions
The following conventions appear in these specifications:
NI 78xx............................................ Refers to PCI/PXI-7811,
PCI/PXI-7813,
PCI/PXI-7831,
PCI/PXI-7833,
PCIe/PXI-7841,
PCIe/PXI-7842,
PCIe/PXI-7851, and
PCIe/PXI-7852 devices.
NI 781x ........................................... Refers to PCI/PXI-7811
and PCI/PXI-7813
devices.
NI 783x ............................................Refers to PCI/PXI-7831
and PCI/PXI-7833
devices.
NI 784x ............................................Refers to PCIe/PXI-7841
and PCIe/PXI-7842
devices.
NI 785x ............................................Refers to PCIe/PXI-7851
and PCIe/PXI-7852
devices.
Analog Input (NI 783x /784x /785x Only)
Input Characteristics
Number of channels
NI 7830....................................... 4
NI 7831/7833/7841/7842/
7851/7852/7853/7854................. 8
Input modes..................................... DIFF, RSE, NRSE
(software-selectable;
selection applies to all
channels)
Type of ADC .................................. Successive
approximation
Resolution ....................................... 16 bits, 1 in 65,536
Conversion time
NI 783x/NI 784x .........................4 μs
NI 785x .......................................1 μs
Maximum sampling rate
NI 783x/784x...............................200 kS/s (per channel)
NI 785x .......................................750 kS/s (per channel)
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Multifunction Reconfigurable I/O Specifications 2 ni.com
Input impedance
Powered on .................................10 GΩ in parallel with
100 pF
Powered off/overload..................4.0 kΩ min
Input signal range ............................±10 V
Input bias current
NI 783x .......................................±2 nA
NI 784x/785x...............................±5 nA
Input offset current
NI 783x .......................................±1 nA
NI 784x/785x...............................±5 nA
Input coupling ................................. DC
Maximum working voltage
(signal + common mode) ................ Inputs should remain
within ±12 V of ground
Overvoltage protection
Powered on ................................. ±42 V
Powered off ................................ ±35 V
Accuracy Information
NI 783x
NI 784x/785x
Nominal Range (V)
Absolute Accuracy Relative Accuracy
% of Reading
Offset
(μV)
Noise +
Quantization (μV)
Tem p
Drift
(%/°C)
Absolute
Accuracy
at Full
Scale
(±mV)
Resolution (μV)
Positive
Full
Scale
Negative
Full
Scale
24
Hours
1 Year
Single
Point
Averaged
Single
Point
Averaged
10.0 –10.0 0.0496 0.0507 2,542 1,779 165 0.0005 7.78 2,170 217
Note: Accuracies are valid for measurements following an internal calibration. Averaged numbers assume dithering and
averaging of 100 single-channel readings. Measurement accuracies are listed for operational temperatures within ±1 °C of
internal calibration temperature and ±10 °C of external or factory-calibration temperature.
Nominal Range (V)
Absolute Accuracy Relative Accuracy
% of Reading
Offset
(μV)
Noise +
Quantization (μV)
Tem p
Drift
(%/°C)
Absolute
Accuracy
at Full
Scale
(±mV)
Resolution (μV)
Positive
Full
Scale
Negative
Full
Scale
24
Hours
1 Year
Single
Point
Averaged
Single
Point
Averaged
10.0 –10.0 0.0186 0.0228 1,591 1,029 91.6 0.0005 3.97 1,205 121
Note: Accuracies are valid for measurements following an internal calibration. Averaged numbers assume dithering and
averaging of 100 single-channel readings. Measurement accuracies are listed for operational temperatures within ±1 °C of
internal calibration temperature and ±10 °C of external or factory-calibration temperature.
© National Instruments Corporation 3 Multifunction Reconfigurable I/O Specifications
DC Transfer Characteristics
INL
NI 783x ....................................... ±3 LSB typ, ±6 LSB max
NI 784x/785x .............................. ±1 LSB typ, ±3 LSB max
DNL
NI 783x ....................................... –1.0 to +2.0 LSB max
NI 784x/785x .............................. ±0.4 LSB typ,
±0.9 LSB max
No missing codes
NI 783x ....................................... 16 bits typ, 15 bits min
NI 784x/785x .............................. 16 bits guaranteed
CMRR, DC to 60 Hz....................... –86 dB
Dynamic Characteristics
Bandwidth
NI 783x
Small signal (–3 dB) .............. 650 kHz
Large signal (1% THD) ......... 55 kHz
NI 784x/785x
Small signal (–3 dB) .............. 1 MHz
Large signal (1% THD) ......... 500 kHz
Settling Time
Crosstalk ......................................... –80 dB, DC to 100 kHz
Device
Step
Size
Accuracy
±16 LSB ±4 LSB ±2 LSB
NI 783x ±20.0 V 7.5 μs 10.3 μs 40 μs
±2.0 V 2.7 μs 4.1 μs 5.1 μs
±0.2 V 1.7 μs 2.9 μs 3.6 μs
NI 784x/
785x
±20.0 V 2.1 μs 4.2 μs 8 μs
±2.0 V 1.3 μs 1.6 μs 1.8 μs
±0.2 V 0.8 μs 1.1 μs 1.2 μs