R Series Intelligent DAQ –
Data Acquisition and Control with Onboard Processing
Specifications
Analog Input (NI 783xR/784xR/785xR Only)
Input Characteristics
Number of channels
NI 7830R ......................................... 4
NI 7831R/7833R/784xR/785xR ...... 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 783xR/NI 784xR ......................... 4 µs
NI 785xR ......................................... 1 µs
Maximum sampling rate
NI 783xR/NI 784xR ......................... 200 kS/s (per channel)
NI 785xR ......................................... 750 kS/s (per channel)
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 783xR ......................................... ±2 nA
NI 784xR/785xR.............................. ±5 nA
Input offset current
NI 783xR ......................................... ±1 nA
NI 784xR/785xR.............................. ±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
Data transfers ..................................... DMA, interrupts, programmed I/O
Accuracy Information – NI 784xR/785xR
Relative Accuracy
Absolute
% of Reading
Accuracy Resolution (µV)
Temp at Full
Positive Negative
Offset Single
Drift Scale Single
24
Full
Full
(µV) Point Averaged (%/°C) (±mV) Point Averaged
Scale Hours 1 Year
Scale
Nominal
Range (V)
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.
Absolute Accuracy
Noise +
Quantization
DC Transfer Characteristics
INL
NI 783xR .........................................
NI 784xR/785xR..............................
DNL
NI 783xR .........................................
NI 784xR/785xR..............................
No missing codes
NI 783xR .........................................
NI 784xR/785xR..............................
CMRR, DC to 60 Hz.............................
±3 LSB typ, ±6 LSB max
±1 LSB typ, ±3 LSB max
-1.0 to +2.0 LSB max
±0.4 LSB typ, ±0.9 LSB max
16 bits typ, 15 bits min
16 bits guaranteed
-86 dB
Settling Time
Device
NI 783xR
Step Size
±20.0 V
±2.0 V
±0.2 V
±20.0 V
±2.0 V
±0.2 V
16 LSB
7.5 µs
2.7 µs
1.7 µs
2.1 µs
1.3 µs
0.8 µs
Accuracy
4 LSB
10.3 µs
4.1 µs
2.9 µs
4.2 µs
1.6 µs
1.1 µs
2 LSB
40 µs
5.1 µs
3.6 µs
8 µs
1.8 µs
1.2 µs
NI 784xR/
785xR
Crosstalk.............................................. -80 dB, DC to 100 kHz
Dynamic Characteristics
Bandwidth
NI 783xR
Small signal (-3 dB) ....................
Large signal (1% THD) ...............
NI 784xR/785xR
Small signal (-3 dB) ....................
Large signal (1% THD) ...............
650 kHz
55 kHz
1 MHz
500 kHz
Accuracy Information – NI 783xR
Nominal
Range (V)
Absolute
Accuracy Resolution (µV)
Temp at Full
Positive Negative
Offset Single
Drift Scale Single
24
Full
Full
Scale
Scale Hours 1 Year (µV) Point Averaged (%/°C) (±mV) Point Averaged
% of Reading
10.0
-10.0 0.0496 0.0507 2,542 1779
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.
Absolute Accuracy
Noise +
Quantization
Relative Accuracy
Analog Output (NI 783xR/784xR/785xR Only)
Output Characteristics
Number of channels
NI 7830R .........................................
NI 7831R/7833R/784xR/785xR ......
Output type .........................................
Resolution ...........................................
Update time ........................................
Maximum update rate ........................
Type of DAC ........................................
Data transfers .....................................
4
8
Single-ended, voltage output
16 bits, 1 in 65,536
1.0 µs
1 MS/s
Enhanced R-2R
DMA, interrupts,
programmed I/O
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
4
NI [ NATIONAL INSTRUMENTS CORPORATION ]
