Analog Input (NI 783xR/784xR/785xR Only)
Input Characteristics
Number of channels
NI 7830R .................................... 4
NI 7831R/7833R/7841R/7842R/
7851R/7852R/7853R/7854R...... 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/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
