Sound and Vibration Data Acquisition
NI USB-4431
NEW!
•
•
•
•
•
•
•
•
One 24-bit analog output
Four 24-bit simultaneous analog inputs
±3.5 V output range
±10 V input range
100 dB dynamic range
Antialiasing filters
TEDS read/write
Software-selectable AC/DC
coupling (0.1 Hz HPF)
Recommended Software
• Sound and Vibration Measurement Suite
• Sound and Vibration Toolkit
• LabVIEW
Analysis Capabilities
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•
•
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Power spectra
Zoom FFTs
Fractional-octave analysis
Vibration-level measurements
Order spectra
Transient analysis
Sound quality
>>
For complete specifications, see the
NI USB-443x Specifications
manual at
ni.com/manuals.
Overview
The NI USB-4431 is a five-channel dynamic signal acquisition module for
making high-accuracy measurements from IEPE sensors. The USB-4431
delivers 100 dB of dynamic range and incorporates software-selectable
IEPE (2.1 mA constant current) signal conditioning for accelerometers
and microphones. The module consists of four analog input channels for
reading from IEPE sensors with a single analog output. The four analog
input channels simultaneously acquire at rates from 2 to 102.4 kS/s. In
addition, each channel includes built-in antialiasing filters that
automatically adjust to your sampling rate. The USB-4431 is ideal for a
wide variety of portable test applications such as frequency response
audio tests or suspension shaker tests.
Hardware
Each simultaneous signal is buffered, analog prefiltered, and sampled
by a 24-bit delta-sigma analog-to-digital converter (ADC) that performs
digital filtering with a cutoff frequency that automatically adjusts to
your data rate. The USB-4431 features a voltage range of ±10 V and a
dynamic range of 100 dB. In addition, the module can read and write
to transducer electronic data sheet (TEDS) Class 1 smart sensors. The
USB-4431 has ±60 V of overvoltage protection and three software-
selectable modes of measurement operation: IEPE-on with AC coupling,
IEPE-off with AC coupling, and IEPE-off with DC coupling.
The module uses a method of analog-to-digital conversion known as
delta-sigma modulation. If, for example, the data rate is 25 kS/s, then
each ADC actually samples its input signal at 3.2 MS/s (128 times the
data rate) and produces samples that are applied to a digital filter. This
filter then expands the data to 24 bits, rejects signal components greater
than 12.5 kHz (the Nyquist frequency), and digitally resamples the data
at the chosen data rate of 25 kS/s. This combination of analog and digital
filtering provides an accurate representation of desirable signals while
rejecting out-of-band signals. The built-in antialiasing filters automatically
adjust themselves to discriminate between signals based on the frequency
range, or bandwidth, of the signal.
The USB-4431 offers analog output using a delta-sigma modulation
digital-to-analog converter (DAC). The overclocking and filtering is done
in the digital domain. The now-filtered signal is then output using a
DAC. The DAC in the USB-4431 combines high image rejection
performance with good flatness in the passband. The analog output also
has the flexibility to generate a variety of signals from a DC voltage, to
43.5 kHz sine waves, to arbitrary waveforms.
Analysis Software
The USB-4431 is well-suited for noise and vibration analysis applications.
The NI Sound and Vibration Measurement Suite, which specifically
addresses these applications, has two components: the NI Sound and
Vibration Assistant and LabVIEW analysis VIs (functions) for power
spectra, frequency response (FRF), fractional octave analysis, sound-level
measurements, order spectra, order maps, order extraction, sensor
calibration, human vibration filters, torsional vibration, and sound quality.
Sound and Vibration Data Acquisition
NI Sound and Vibration Assistant
The Sound and Vibration Assistant is interactive software designed to
simplify the process of acquiring and analyzing noise and vibration
signals by offering:
• A drag-and-drop, interactive analysis and acquisition environment
• Rapid measurement configuration
• Extended functionality through LabVIEW
Extended Functionality through LabVIEW
Reuse your measurement applications developed with the Sound and
Vibration Assistant in LabVIEW by converting projects into LabVIEW
block diagrams. With the LabVIEW full-featured graphical programming
environment, you can further automate your application or customize
your analysis.
Sound and Vibration Analysis VIs for LabVIEW
With the sound and vibration analysis VIs in LabVIEW, you can develop
a variety of custom audio, acoustic, and vibration applications.
Functionality includes:
• Full, 1/3, 1/6, 1/12, and 1/24 octave analysis with linear A-, B-,
or C-weighting
• Vibration level with single or double integration
• Sound level with linear A-, B-, or C-weighting
• Baseband, zoom, and subset power spectrum
• Peak search
• Power-in-band
• Frequency response (FRF)
• Filtering
• Swept sine
• Distortion analysis (THD, THD+N, IMD)
• Noise measurements (SNR)
• Human vibration weighting filters
• Torsional vibration
• Sound quality analysis
• Tachometer signal processing
• Order tracking
• Order spectrum
• Order extraction
• New order plots (Bode and polar, shaft centerline, and orbit
and timebase)
• Spectral map
• Waterfall display for power, octave, and order spectra
Figure 1. Characterize vibration orders and orbit position with drag-and-drop analysis blocks.
Interactive Analysis Environment
The Sound and Vibration Assistant introduces an innovative approach
to configuring your measurements using intuitive drag-and-drop steps.
Combining the functionality of traditional noise and vibration analysis
software with the flexibility to customize and automate routines, the
Sound and Vibration Assistant can help you streamline your application.
Rapid Measurement Configuration
You can immediately use the many built-in steps in the Sound and
Vibration Assistant. Instantly configure a measurement and analysis
application with:
• Hardware I/O – generation and acquisition of signals from a variety of
devices, including data acquisition devices and modular instruments
• Signal processing – filtering, windowing, and averaging
• Time-domain analysis – sound- and vibration-level measurements
• ANSI and IEC fractional-octave analysis
• Frequency-domain analysis – power spectrum, frequency response,
power-in-band, peak search, and distortion
• Order analysis – tachometer processing, order power spectrum, order
tracking, and order extraction
•
NEW!
Bode and polar, orbit and timebase, and shaft centerline plot steps
•
NEW!
Sound quality – sharpness, loudness, and
roughness measurements
• Report generation – ability to drag and drop signals to Microsoft Excel
or export data to Microsoft Word or UFF58 files
Figure 2. Easy-to-Configure Octave Analysis Splash Screen
BUY ONLINE
at
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or
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2
Sound and Vibration Data Acquisition
• Data presentation in cascade, shaft centerline, orbit, Bode, or polar
plot format
• Shock response spectrum
• File input and output to UFF58
acquisition, National Instruments recommends DSA devices. With 24-bit
ADCs and DACs and integrated antialiasing filters, DSA devices are ideal
for acoustic, noise, and vibration measurements.
There are numerous system requirements to consider when selecting
data acquisition hardware for measuring or generating sound and
vibration signals. From IEPE signal conditioning for accelerometers and
microphones to high dynamic range (up to 118 dB) and multichannel
synchronization (up to 13,000 channels), National Instruments offers a
wide range of hardware products for your applications.
TEDS
Support Analog Outputs
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2
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–
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–
–
–
–
1
Recommended Hardware
The Sound and Vibration Measurement Suite includes more than 50
examples that work with both dynamic signal acquisition (DSA) and
multifunction data acquisition devices. For sound and vibration data
Input Resolution Dynamic Range Sampling Rate Analog
(bits)
(dB)
per Channel (kS/s) Inputs
24
24
24
24
24
24
24
24
24
24
24
118
118
114
114
114
110
110
102
102
101
100
204.8
204.8
204.8
204.8
204.8
102.4
102.4
50
51.2
102.4
102.4
2
4
16
16
16
8
4
4
4
5
4
Product
Bus
Input Range
±42 V to 316 mV
±42 V to 316 mV
±10 to 1 V
±10 to 1 V
±10 V to 316 mV
±10 V
±10 V
±5 V
±5 V
±40 V
±10 V
Gain Settings
-20 to 30 dB in 10 dB increments
-20 to 30 dB in 10 dB increments
0 and 20 dB
0 and 20 dB
0 to 30 dB in 10 dB increments
N/A
N/A
N/A
N/A
N/A
N/A
Coupling
AC/DC
AC/DC
DC
AC
AC
AC/DC
AC/DC
AC
AC/DC
AC/DC
AC/DC
High Performance
NI 4461
PXI, PCI
NI 4462
PXI, PCI
High Density
NI 4495
PXI
NI 4496 PXI, PXI Express
NI 4498 PXI, PXI Express
Low Cost
NI 4472
PXI, PCI
NI 4474
PCI
Portable/Compact
NI 9233
USB
NI 9234
USB, Wi-Fi
NI 4432
USB
NI 4431
USB
Table 2. NI Dynamic Signal Acquisition Hardware
Ordering Information
NI USB-4431 ..........................................................................780164-01
NI USB-4431 with Sound and Vibration
Measurement Suite ..........................................................780165-01
NI USB-4432 ..........................................................................780421-01
NI USB-4432 with Sound and Vibration
Measurement Suite ..........................................................780422-01
BUY NOW!
For complete product specifications, pricing, and
accessory information, call 800 813 3693 (U.S.) or
go to
ni.com/soundandvibration.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
3
Sound and Vibration Data Acquisition
Specifications
Analog Input
Input channels
NI USB-4431 ...................................
NI USB-4432 ...................................
Input connector ...................................
ADC resolution....................................
ADC type .............................................
Sampling mode ...................................
Sample rates (ƒ
s
) .................................
4
5
1 BNC per channel
24 bits
Delta-sigma
Simultaneous
1 kS/s to 102.4 kS/s in
349.2 µS/s increments
Sample rate accuracy ......................... ±100 ppm max
Input range
NI USB-4431 ................................... ±10 V
pk
NI USB-4432 ................................... ±40 V
pk
Input protection................................... ±60 V max
Safety and Compliance
Safety
This product is designed to meet the requirements of the following
standards of safety for electrical equipment for measurement, control,
and laboratory use:
• IEC 61010-1, EN 61010-1
• UL 61010-1, CSA 61010-1
Note:
For UL and other safety certifications, refer to the product label or
visit
ni.com/certification,
search by model number or product line, and
click the appropriate link in the Certification column.
Electromagnetic Compatibility
This product meets the requirements of the following EMC standards
for electrical equipment for measurement, control, and laboratory use:
• EN 61326 (IEC 61326): Class A emissions; Basic immunity
• EN 55011 (CISPR 11): Group 1, Class A emissions
• AS/NZS CISPR 11: Group 1, Class A emissions
AI Distortion and Noise
Input Signal Frequency (ƒ
in
)
20 Hz to 20 kHz
20 Hz to 46.4 kHz
THD
-99 dB typ
-93 dB max
-93 dB typ
-87 dB max
THD+N
-90 dB typ
-84 dB max
-86 dB typ
-80 dB max
• FCC 47 CFR Part 15B: Class A emissions
• ICES-001: Class A emissions
Note:
For EMC compliance, operate this product according to
the documentation.
Analog Output
Output channels..................................
AO signal connection..........................
AO frequency range ............................
AO frequency accuracy .......................
DAC resolution....................................
DAC type .............................................
Output signal range ............................
Output coupling...................................
Short circuit protection .......................
Minimum working load.......................
Output impedance...............................
1
BNC
DC to 43.5 kHz
±100 ppm max
24 bits
Delta-sigma
±3.5 V
pk
DC
Indefinite
1 kΩ
50
Ω
CE Compliance
This product meets the essential requirements of applicable European
Directives, as amended for CE marking, as follows:
• 2006/95/EC; Low-Voltage Directive (safety)
• 2004/108/EC; Electromagnetic Compatibility Directive (EMC)
Note:
Refer to the Declaration of Conformity (DoC) for this product for
any additional regulatory compliance information. To obtain the DoC for
this product, visit
ni.com/certification,
search by model number or
product line, and click the appropriate link in the Certification column.
Waste Electrical and Electronic Equipment (WEEE)
EU Customers:
At the end of their life cycle, all products must be
sent to a WEEE recycling center. For more information about WEEE
recycling centers and National Instruments WEEE initiatives,
visit
ni.com/environment/weee.htm.
AO Distortion
Update Rate (kS/s)
51.2
80
96
THD (1 kHz)
-100 dB typ
-97 dB typ
-95 dB typ
THD (20 Hz to 20 kHz)
-89 dB max
-86 dB max
-85 dB max
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4
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