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 783xR

Accuracy Information – NI 784xR/785xR

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

Crosstalk..............................................

-80 dB, DC to 100 kHz

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

Analog Output (NI 783xR/784xR/785xR Only)

Output Characteristics

Number of channels

NI 7830R .........................................

4

NI 7831R/7833R/784xR/785xR ......

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

R Series Intelligent DAQ –

Data Acquisition and Control with Onboard Processing

4

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Nominal

Range (V)

Absolute Accuracy

Relative Accuracy

% of Reading

Offset

(µV)

Noise +

Quantization

Temp

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 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.

Device

Step Size

Accuracy

16 LSB

4 LSB

2 LSB

NI 783xR

±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 784xR/

785xR

±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

Nominal

Range (V)

Absolute Accuracy

Relative Accuracy

% of Reading

Offset

(µV)

Noise +

Quantization

Temp

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.