R Series Intelligent DAQ –
Data Acquisition and Control with Onboard Processing
Accuracy Information – NI 784xR/785xR
Specifications
Analog Input (NI 783xR/784xR/785xR Only)
Absolute Accuracy
Relative Accuracy
Nominal
Range (V)
Noise +
Quantization
Absolute
Accuracy Resolution (µV)
Temp at Full
Drift Scale
(%/°C) ( mV)
% of Reading
24
Positive Negative
Full
Input Characteristics
Number of channels
Offset
(µV)
Full
Single
Single
Point Averaged
Scale
Scale Hours 1 Year
Point Averaged
NI 7830R.........................................
NI 7831R/7833R/784xR/785xR ......
Input modes ........................................ DIFF, RSE, NRSE
(software-selectable; selection
4
8
10.0
Note:
-10.0 0.0186 0.0228 1,591 1,029 91.6 0.0005 3.97
1,205
121
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.
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
DC Transfer Characteristics
INL
NI 783xR ......................................... 3 LSB typ, 6 LSB max
NI 784xR/785xR.............................. 1 LSB typ, 3 LSB max
DNL
NI 783xR ......................................... -1.0 to +2.0 LSB max
NI 784xR/785xR.............................. 0.4 LSB typ, 0.9 LSB max
No missing codes
NI 783xR ......................................... 16 bits typ, 15 bits min
NI 784xR/785xR.............................. 16 bits guaranteed
CMRR, DC to 60 Hz............................. -86 dB
Settling Time
Accuracy
Device
Step Size
16 LSB
7.5 µs
2.7 µs
1.7 µs
2.1 µs
1.3 µs
0.8 µs
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
20.0 V
2.0 V
0.2 V
20.0 V
2.0 V
0.2 V
NI 783xR
NI 784xR/
785xR
1.8 µs
1.2 µs
(signal + common mode)............ Inputs should remain
within 12 V of ground
Crosstalk.............................................. -80 dB, DC to 100 kHz
Overvoltage protection
Dynamic Characteristics
Bandwidth
NI 783xR
Small signal (-3 dB).................... 650 kHz
Large signal (1% THD) ............... 55 kHz
NI 784xR/785xR
Small signal (-3 dB).................... 1 MHz
Large signal (1% THD) ............... 500 kHz
Powered on ................................ 42 V
Powered off................................ 35 V
Data transfers ..................................... DMA, interrupts, programmed I/O
Accuracy Information – NI 783xR
Absolute Accuracy
Relative Accuracy
Nominal
Noise +
Quantization
Absolute
Accuracy Resolution (µV)
Temp at Full
Range (V)
% of Reading
24
Positive Negative
Full
Offset
(µV)
Drift Scale
(%/°C) ( mV)
Analog Output (NI 783xR/784xR/785xR Only)
Full
Single
Point Averaged
Single
Point Averaged
Scale
Scale Hours 1 Year
Output Characteristics
Number of channels
NI 7830R.........................................
NI 7831R/7833R/784xR/785xR ......
10.0
Note:
-10.0 0.0496 0.0507 2,542 1779
165 0.0005 7.78
2,170
217
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.
4
8
Output type ......................................... Single-ended, voltage output
Resolution ........................................... 16 bits, 1 in 65,536
Update time ........................................ 1.0 µs
Maximum update rate ........................ 1 MS/s
Type of DAC ........................................ Enhanced R-2R
Data transfers ..................................... DMA, interrupts,
programmed I/O
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)
4
NI [ National Instruments ]
