National Instruments NI 447 Series User Manual page 52

Appendix A Specifications
NI 447X User Manual
Transfer Characteristics
Offset (residual DC) ...............................±3 mV, max
Gain (amplitude accuracy)......................±0.1 dB, max, ƒ
Amplifier Characteristics
Input impedance (ground referenced)
Positive input ...................................1 MΩ in parallel with 60 pF
Negative input (shield) ....................50 Ω in parallel with 0.02 µF
Flatness (relative to 1 kHz).....................±0.1 dB, DC to 0.4535 f
−3 dB bandwidth.....................................0.4863 f
Input coupling.........................................AC or DC, software-selectable
AC −3 dB cutoff frequency
NI 447X ....................................3.4 Hz (except NI PXI-4472B)
NI PXI-4472B ..........................0.5 Hz
Overvoltage protection
Positive input ...................................±42.4 V
Negative input (shield) ....................Not protected
Inputs protected
NI PCI/PXI-4472......................CH<0..7>
NI PCI-4474 .............................CH<0..3>
Common mode rejection ratio (CMRR)
f < 1 kHz ........................................>60 dB, min
in
Noise .......................................................Refer to Figures A-1 through A-3
DC-coupled
A-2
= 1 kHz
in
, max,
s
s
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