24-Bit, 102.4 kS/s, 8 and 4-Channel
Dynamic Signal Acquisition
NI 4472 Series, NI PCI-4474
• 24-bit resolution
• 110 dB dynamic range
• 102.4 kS/s maximum
sampling rate
Operating Systems
• Windows 2000/NT/XP
• LabꢀIEW Real-Time
• Mac OS X
• 45 kHz alias-free bandwidth
Recommended Software
• LabꢀIEW
• LabꢀIEW Sound and
ꢀibration Analysis Toolkit
• LabꢀIEW Order
•
10 ꢀ range
• AC/DC coupling
• IEPE conditioning –
software configurable
• Multiple-device synchronization
Analysis Toolkit
• LabWindows/CꢀI
• Measurement Studio
Measurement Services
Software (included)
• NI-DAQmx
Analog
Inputs Resolution
8
8
4
Sampling
Rate
102.4 kS/s
102.4 kS/S
102.4 kS/S
Input
Range
10 V Analog and digital
10 V Analog and digital
10 V Analog and digital
AC Cutoff
Frequency
3.4 Hz
0.5 Hz
3.4 Hz
Applications
dynamic range greater than 110 dB can be
achieved. Using state-of-the-art delta-sigma
modulating ADCs, the NI 447x devices
achieve low noise and low distortion.
Because these ADCs use a 1-bit quantizer
oversampled at a multiple of the specified
Device
NI 4472
NI 4472B
NI 4474
Bus
PCI, PXI
PXI
Triggering
Noise and vibration diagnostics
Audio test and measurement
Machine condition monitoring
Sound power
Telecommunications testing
Structural vibration
24 bits
24 bits
24 bits
PCI
Table 1. NI 447x Channel, Speed, and Resolution Specifications
Pass-by noise
Overview
sampling rate, they produce extraordinary linearity. Extremely flat,
The National Instruments PCI-4472 and PXI-4472 are 8-channel linear-phase, lowpass digital filters then remove aliases and shape the
dynamic signal acquisition devices for making high-accuracy audio- quantization noise from the band of interest. Using the delta-sigma
frequency measurements. The NI PCI-4474 is a similar 4-channel modulating ADCs, an NI 447x is immune to the DNL distortion
board. The vibration-optimized PXI-4472B offers a lower AC associated with conventional data acquisition devices.
cutoff frequency of 0.5 Hz. Input channels incorporate Integrated
Electronic Piezoelectric (IEPE) signal conditioning for
accelerometers and microphones. The input channels of an NI 447x
simultaneously digitize input signals over a bandwidth from DC to
45 kHz. You can synchronize multiple NI 447x devices for high-
channel-count applications, or with other modules using the PXI star
>110 dB (24-bit)
trigger bus or the RTSI bus on PCI. When used with the Sound and
ꢀibration Toolkit or other software analysis tools, an NI 447x can
obtain a variety of accurate time and frequency measurements for
your application.
Hardware
Analog Inputs
Figure 1. The 24-bit architecture of the NI 447x devices deliver more than 110 dB dynamic
range and a significantly lower noise floor than 12, 16, and comparable 24-bit products.
NI 447x devices have four or eight analog inputs with 24-bit
resolution ADCs that are simultaneously sampled at a software-
programmable rate. The high resolution provides the necessary Antialiasing
accuracy to make NI 447x devices well suited for audio and vibration The analog inputs have both analog and real-time digital filters
analysis applications.
implemented in hardware to prevent aliasing. Input signals are first
Outstanding measurements can be achieved with an NI 447x. passed through fixed analog filters to remove any signals with
For example, when sampling at 51.2 kS/s and using a 16 k FFT, a frequency components beyond the range of the ADCs; then digital
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