Sound and Vibration Data Acquisition
NI 9233, NI 9234
NEW!
•
•
•
•
•
•
24-bit resolution
102 dB dynamic range
4 simultaneous analog inputs
±5 V input range
Antialiasing filters
TEDS read/write
Supported Hardware Platforms
•
•
•
•
NI CompactDAQ
CompactRIO
Hi-Speed USB carrier
Wi-Fi/Ethernet carrier
Recommended Software
• LabVIEW
• Sound and Vibration Toolkit
• Sound and Vibration Measurement Suite
Model
NI 9233
NI 9234
Max Sampling Rate
50 kS/s
51.2 kS/s
IEPE
Always enabled (2 mA)
Software selectable
(0 or 2 mA)
Coupling
AC coupling
Software selectable
AC/DC coupling
Table 1. NI C Series Dynamic Signal Acquisition Selection Guide
Overview
NI 9233 and 9234 are 4-channel dynamic signal acquisition (DSA)
modules for making high-accuracy measurements from IEPE sensors.
These C Series analog input modules deliver 102 dB of dynamic range
and incorporate IEPE (2 mA constant current) signal conditioning for
accelerometers and microphones. The four input channels simultaneously
acquire at rates from 2 to 50 kHz or, with the NI 9234, up to 51.2 kS/s.
In addition, the modules include built-in antialiasing filters that
automatically adjust to your sampling rate. NI 9233/9234 modules
are ideal for a wide variety of mobile/portable applications such as
industrial machine condition monitoring and in-vehicle noise, vibration,
and harshness testing.
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. NI 9233/9234 modules feature a voltage range of ±5 V and a
dynamic range of more than 100 dB. In addition, the modules include the
Analysis Capabilities
Power spectra
Zoom FFTs
Fractional-octave analysis
Vibration level measurements
Order spectra
Transient analysis
capability to read and write to transducer electronic data sheet (TEDS)
Class 1 smart sensors. NI 9233/9234 modules provide ±30 V of overvoltage
protection (with respect to chassis ground) for IEPE sensor connections.
The NI 9234 has three software-selectable modes of measurement
operation: IEPE-on with AC coupling, IEPE-off with AC coupling, and
IEPE-off with DC coupling. IEPE excitation and AC coupling are not
software-selectable and are always enabled for the NI 9233.
NI 9233/9234 modules use a method of A/D 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.
Sound and Vibration Data Acquisition
Wi-Fi/Ethernet Platform
NEW!
NI Wi-Fi data acquisition (DAQ) devices combine IEEE 802.11 wireless
or Ethernet communication; direct sensor connectivity; and the flexibility
of NI LabVIEW software for remote monitoring of electrical, physical,
mechanical, and acoustical signals. NI Wi-Fi DAQ devices can stream
data on each channel at more than 50 kS/s with 24 bits of resolution. In
addition, built-in NIST-approved 128-bit AES encryption and advanced
network authentication methods offer the highest commercially available
network security. With the flexibility of LabVIEW graphical programming
and ubiquity of 802.11 network infrastructure, NI Wi-Fi DAQ makes it
easy to incorporate wireless connectivity into new or existing PC-based
measurement or control systems.
NI CompactDAQ Platform
NI CompactDAQ delivers the simplicity of USB to sensor and electrical
measurements on the benchtop, in the field, and on the production line.
By combining the ease of use and low cost of a data logger with the
performance and flexibility of modular instrumentation, NI CompactDAQ
offers fast, accurate measurements in a small, simple, and affordable
system. Flexible software options make it easy to use NI CompactDAQ to
log data for simple experiments or to develop a fully automated test or
control system. The modular design can measure up to 256 channels of
electrical, physical, mechanical, or acoustical signals in a single system.
In addition, per-channel ADCs and individually isolated modules ensure
fast, accurate, and safe measurements.
USB Platform
The NI Hi-Speed USB carrier makes portable data acquisition easy.
Simply plug an NI 9233/9234 module into the USB carrier and begin
acquiring data. Communication to the USB carrier is over Hi-Speed USB,
guaranteeing data throughput.
NI CompactRIO Platform
When used with the small, rugged CompactRIO embedded control and
data acquisition system, NI C Series analog input modules connect
directly to reconfigurable I/O (RIO) field-programmable gate array
(FPGA) hardware to create high-performance embedded systems. The
reconfigurable FPGA hardware within CompactRIO provides a variety of
options for custom timing, triggering, synchronization, filtering, signal
processing, and high-speed decision making for all C Series analog
input modules. For instance, with CompactRIO, you can implement
custom triggering for any analog sensor type on a per-channel basis
using the flexibility and performance of the FPGA and the numerous
arithmetic and comparison function blocks built into NI LabVIEW FPGA.
BUY ONLINE
at
ni.com
or
CALL 800 813 3693 (U.S.)
2
Sound and Vibration Data Acquisition
Analysis Software
NI 9233/9234 modules are 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, and torsional vibration.
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
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
There are many built-in steps available for immediate use in the Sound
and Vibration Assistant. You can 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
• Report generation – ability to drag and drop signals to Microsoft Excel
or export data to Microsoft Word or UFF58 files
Figure 1. NI Sound and Vibration Assistant Performing Engine Run-Up Test
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
• Baseband, zoom, and subset power spectrum
• Peak search and power in band
• Frequency response (FRF)
• Filtering
• Swept sine
• Distortion analysis (THD, THD+N, IMD)
• Noise measurements (SNR)
• Human vibration weighting filters
• Torsional vibration
• Tachometer signal processing
• Order tracking, spectrum, and order extraction
• Waterfall display for power, octave, and order spectra
• Shaft centerline, orbit, Bode, and polar plot format
• File input and output to UFF58
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at
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or
CALL 800 813 3693 (U.S.)
3
Sound and Vibration Data Acquisition
Recommended Hardware
The Sound and Vibration Measurement Suite includes more than
50 examples that work with both DSA and multifunction data acquisition
devices. For sound and vibration data acquisition, National Instruments
recommends DSA devices. With 24-bit ADCs and digital-to-analog
converters (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.
Product
Bus
High Performance
NI 4461
PXI, PCI
NI 4462
PXI, PCI
High Density
NI 4495
PXI
NI 4496
PXI, PXIe
NI 4498
PXI, PXIe
Low Cost
NI 4472
PXI, PCI
NI 4474
PCI
Ultraportable
NI 9233
USB
NI 9234
USB, Wi-Fi
Input Resolution
(bits)
24
24
24
24
24
24
24
24
24
Dynamic
Range (dB)
118
118
114
114
114
110
110
102
102
Sampling Rate
per Channel
204.8 kS/s
204.8 kS/s
204.8 kS/s
204.8 kS/s
204.8 kS/s
102.4 kS/s
102.4 kS/s
50 kS/s
51.2 kS/s
Analog Inputs
2
4
16
16
16
8
4
4
4
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
Gain Settings
-20 to 30 dB in 10 dB increments
-20 to 30 dB in 10 dB increments
0 to 20 dB
0 to 20 dB
0 to 20 dB
–
–
–
–
Coupling
AC/DC
AC/DC
DC
AC
AC
AC/DC
AC/DC
AC
AC/DC
TEDS
Support
–
–
–
Analog
Outputs
2
–
–
–
–
–
–
–
–
Table 2. Additional NI Dynamic Signal Acquisition Devices
Ordering Information
NI 9234 ..................................................................................779680-01
NI 9234 with Sound and Vibration
Measurement Suite ..............................................................779680-02
NI USB-9234 ..........................................................................780235-01
NI USB-9234 with Sound and Vibration
Measurement Suite ..............................................................780235-02
NI WLS-9234 ........................................................................780507-01
NI WLS-9234 with Sound and Vibration
Measurement Suite ..............................................................780507-02
NI ENET-9234 ........................................................................780508-01
NI ENET-9234 with Sound and Vibration
Measurement Suite ..............................................................780508-02
NI 9233 ..................................................................................779015-01
NI 9233 with Sound and Vibration
Measurement Suite ..............................................................779015-02
NI USB-9233 with USB carrier..............................................779365-01
NI USB-9233 with Sound and Vibration
Measurement Suite ..............................................................779366-01
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.)
4
Sound and Vibration Data Acquisition
NI 9233 Specifications
>>
For complete specifications, see the
NI 9233 Operating
NI 9234 Specifications
>>
For complete specifications, see the
NI 9234 Operating
Instructions and Specifications
at
ni.com/manuals.
The following specifications are typical for the range 0 to 60 °C unless
otherwise noted.
Instructions and Specifications
at
ni.com/manuals.
The following specifications are typical for the range 0 to 60 °C unless
otherwise noted.
Input Characteristics
Number of channels............................ 4 analog input
ADC resolution.................................... 24 bits
Type of ADC ....................................... Delta-sigma
(with analog prefiltering)
Data rate (fs)
Minimum......................................... 2 kS/s
Maximum........................................ 50 kS/s
Master timebase (internal)
Frequency........................................ 12.8 MHz
Accuracy ......................................... ±100 ppm max
Input coupling ................................. AC
AC cutoff frequency
-3 dB................................................ 0.5 Hz typ
-0.1 dB............................................. 4.2 Hz max
AC voltage full-scale range
Typical ............................................. 5.4 V
pk
Minimum......................................... 5 V
pk
Maximum........................................ 5.8 V
pk
Common-mode voltage
(AI- to earth ground) ....................... ±2 V
IEPE excitation current
Minimum......................................... 2.0 mA
Typical ............................................. 2.2 mA
IEPE compliance voltage ................ 19 V max
Overvoltage protection (with respect to chassis ground)
For an IEPE sensor connected
to AI+ and AI- ................................. ±30 V
For a low-impedance source connected
to AI+ and AI- ................................. -6 to 30 V
Input Characteristics
Number of channels............................ 4 analog input
ADC resolution.................................... 24 bits
Type of ADC ........................................ Delta-sigma
(with analog prefiltering)
Data rate (fs)
Minimum......................................... 1.65 kS/s
Maximum........................................ 51.2 kS/s
Master timebase (internal)
Frequency........................................ 13.1 MHz
Accuracy ......................................... ±50 ppm max
Input coupling ..................................... Software-selectable AC/DC
AC cutoff frequency
-3 dB................................................ 0.5 Hz typ
-0.1 dB............................................. 4.6 Hz max
AC voltage full-scale range
Typical ............................................. 5.1 V
pk
Minimum......................................... 5 V
pk
Maximum........................................ 5.2 V
pk
Common-mode voltage
(AI- to earth ground) ....................... ±2 V
IEPE excitation current
Minimum......................................... 2.0 mA
Typical ............................................. 2.1 mA
IEPE compliance voltage..................... 19 V max
Overvoltage protection (with respect to chassis ground)
For an IEPE sensor connected
to AI+ and AI- ................................. ±30 V
For a low-impedance source connected
to AI+ and AI- ................................. -6 to 30 V
Accuracy (0 to 60 °C)
Error
Calibrated max
Calibrated typ
Uncalibrated max
Accuracy
±0.3 dB
±0.1 dB
±0.6 dB
Accuracy (0 to 60 °C)
Error
Calibrated max
Calibrated typ
Uncalibrated max
Accuracy
±0.3 dB
±0.002 dB
±0.16 dB
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