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© National Instruments Corporation A-1 NI 7831R User Manual
A
Specifications
This appendix lists the specifications of the NI 7831R. These specifications
are typical at 25 °C unless otherwise noted.
Analog Input
Input Characteristics
Number of channels ...............................8
Input modes............................................DIFF, RSE, NRSE
(software-selectable; selection
applies to all 8 channels)
Type of ADC.......................................... Successive approximation
Resolution ..............................................16 bits, 1 in 65,536
Conversion time.....................................4
µs
Maximum sampling rate ........................200 kS/s (per channel)
Input impedance
Powered on .....................................10 GΩ in parallel with 100 pF
Powered off.....................................4 kΩ min
Overload..........................................4 kΩ min
Input signal range...................................±10 V
Input bias current ...................................±2nA
Input offset current.................................±1nA
Input coupling ........................................DC
Maximum working voltage
(signal + common mode) .......................Inputs should remain
within ±12 V of ground