National Instruments NI 435 Series, User Manual, Page: 55 / 77

Appendix A Specifications
© National Instruments Corporation A-7 NI 435x User Manual
Input coupling ........................................ DC
Over-voltage protection
(CH<0..8/15>, I
EX±
,
I
EX0±
, I
EX1±
) ..................................... ±42 V powered on;
±17 V powered off
Data transfers ......................................... Interrupts, programmed I/O
Warm-up time ........................................ 30 minutes
Amplifier Characteristics
Input impedance
Normal powered on ........................ >1 G
Ω
in parallel with 0.39
µ
F
Powered off..................................... 10 k
Ω
Overload.......................................... 10 k
Ω
Open-thermocouple detection ................ 10 M
Ω
between CH+ and +2.5 V
(software-selectable)
Ground-referencing ................................ 10 M
Ω
between CH– and ground
(software-selectable)
Input bias current ................................... <500 pA
CMR (DC, 50 Hz, 60 Hz, 400 Hz)
Range
≥
2.5 V .................................. 80 dB
Range <2.5 V .................................. 100 dB
NMR (50 Hz, 60 Hz, 400 Hz) ................ >100 dB
Dynamic Characteristics
Bandwidth .............................................. 20 Hz
Step response (full-scale step)
)
Accuracy Time(s)
±0.1% 0.3
±0.01% 0.5
±0.0015% 2.4