Multifunction_RIO_Specs.pdf - 第3页
© National Instruments Cor poration 3 Multifunction Reconf igurable I/O Specifications DC T ransfer Characteristics INL NI 783 x ........ ............................. .. ±3 LSB typ, ±6 LSB max NI 784 x /785 x ..........…
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
Multifunction Reconfigurable I/O Specifications 4 ni.com
Analog Output (NI 783x /784x /785x Only)
Output Characteristics
Output type ......................................Single-ended,
voltage output
Number of channels
NI 7830 .......................................4
NI 7831/7833/7841/7842/
7851/7852/7853/7854 .................8
Resolution ....................................... 16 bits, 1 in 65,536
Update time..................................... 1.0 μs
Maximum update rate ..................... 1 MS/s
Type of DAC .................................. Enhanced R-2R
Accuracy Information
DC Transfer Characteristics
INL ..................................................±0.5 LSB typ,
±4.0 LSB max
DNL.................................................±0.5 LSB typ,
±1 LSB max
Monotonicity ...................................16 bits, guaranteed
Voltage Output
Range...............................................±10 V
Output coupling ...............................DC
Output impedance
NI 783x .......................................1.25 Ω
NI 784x/785x...............................0.5 Ω
Current drive....................................±2.5 mA
Protection.........................................Short-circuit to ground
Power-on state .................................User configurable
Dynamic Characteristics
Settling time
Slew rate ......................................... 10 V/μs
Noise ............................................... 150 μV
rms
, DC to 1 MHz
Glitch energy
at midscale transition ...................... ±200 mV for 3 μs
Nominal Range (V)
Absolute Accuracy
Absolute
Accuracy at
Full Scale
(mV)
% of Reading
Offset (μV)
Tem p Drift
(%/°C)
Positive Full
Scale
Negative Full
Scale
24 Hours 1 Year
10.0 –10.0 0.0335 0.0351 2366 0.0005 5.88
Note: Accuracies are valid for analog output following an internal calibration. Analog output accuracies are listed for
operation temperatures within ±1 °C of internal calibration temperature and ±10 °C of external or factory calibration
temperature. Temp Drift applies only if ambient is greater than ±10 °C of previous external calibration.
Step Size
Accuracy
±16 LSB ±4 LSB ±2 LSB
±20.0 V 6.0 μs 6.2 μs 7.2 μs
±2.0 V 2.2 μs 2.9 μs 3.8 μs
±0.2 V 1.5 μs 2.6 μs 3.6 μs