Getting Started With The Ni 447X; About The Ni 447X - National Instruments NI 447 Series User Manual

Getting Started with the NI 447X

About the NI 447X

© National Instruments Corporation
This chapter describes the NI 447X family of dynamic signal acquisition
devices, which includes the NI PCI-4472, NI PCI-4474, NI PXI-4472, and
NI PXI-4472B. It lists what you need to get started, explains how to unpack
the device, and describes your programming choices.
The NI 447X devices are high-performance, high-accuracy analog input
devices that are part of the National Instruments Dynamic Signal
Acquisition/Analysis (DSA) product family. These devices are specifically
designed for demanding dynamic signal acquisition applications.
The NI PCI/PXI-4472 (including the NI PXI-4472B) features eight analog
input (AI) channels, and the NI PCI-4474 has four AI channels. The AI
channels on all NI 447X devices are simultaneously sampled at a maximum
rate of 102.4 kS/s with 24-bit resolution and multiple triggering modes,
including external digital triggering. Each AI channel has an independent
software-switchable 4 mA current source for integrated circuit
piezoelectric, also known as
accelerometers and microphone preamplifiers. The NI PXI-4472B differs
from the other NI 447X devices in having a lower cutoff frequency for
AC-coupled input channels. All references to the NI PXI-4472 in this
manual also apply to the NI PXI-4472B unless otherwise noted. Refer to
Appendix A, Specifications, for more details about the NI 447X.
The AI circuitry uses oversampling delta-sigma modulating A/D converters
(ADCs). Delta-sigma converters are inherently linear, provide built-in
brick-wall antialiasing filters, and have specifications that exceed other
conventional technology for this application with regard to total harmonic
distortion (THD), signal-to-noise ratio (SNR), and amplitude flatness.
These features help you acquire signals with high accuracy and high
fidelity without introducing noise or out-of-band aliases.
Applications for NI 447X devices include audio signal processing and
analysis, acoustics and speech research, sonar, audio frequency test and
measurement, vibration, structural dynamics, and modal analysis, or any
application requiring high-fidelity signal acquisition.
Integral Electronic Piezoelectric
1-1
1
(IEPE),
NI 447X User Manual