779131-01 [NI]
24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation; 24位， 204.8 kS / s的动态信号采集和生成
| 型号： | 779131-01 |
| 厂家： | 
National Instruments |
| 描述： | 24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation |
| 文件： | 总6页 (文件大小：753K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation
NI 4461, NI 4462
• 2 or 4 simultaneously sampled
analog inputs
Operating Systems
• Windows 2000/NT/XP
• 2 simultaneously updated
analog outputs (NI 4461 only)
Recommended Software
• LabVIEW
• LabVIEW Real-Time Module
• LabVIEW Sound and
Vibration Toolkit
• LabVIEW Order Analysis Toolkit
• LabWindows/CVI
• 118 dB dynamic range, 24-bit resolution
• 204.8 kS/s maximum sampling rate
• 92 kHz alias-free bandwidth
• Input range from 316 mV to 42.4 V
• 6 gain settings
• AC/DC coupling
• Measurement Studio
• Antialiasing and anti-imaging protection
• IEPE conditioning – software-configurable
• Multimodule synchronization
Measurement Services Software
(included)
• NI-DAQmx
Calibration Certificate Available
Analog
Inputs Resolution
2
4
Input
Sampling
Rate
Input
Range
Input
Configuration
Analog
Outputs
2
0
Output
Resolution
24 bits
–
Update
Rate
204.8 kS/s
–
Output
Range
Product
NI 4461
NI 4462
Bus
PXI, PCI
PXI, PCI
Triggering
24 bits
24 bits
204.8 kS/s 316 mV to 42.4 V Differential/pseudodifferential
204.8 kS/s 316 mV to 42.4 V Differential/pseudodifferential
100 mV to 10 V Analog/digital
Analog/digital
–
Table 1. NI 446x Channel, Speed, and Resolution Specifications
Overview
Analog Inputs
The analog input channels of NI 446x devices have 24-bit resolution ADCs
that are simultaneously sampled at software-programmable rates for
standard audio applications, such as 44.1 kS/s (the standard rate used in
CD players), 48.0 kS/s (the rate used in digital audio tape (DAT) recorders
and other digital audio equipment), 96.0 kS/s, and 192 kS/s. An NI 446x is
well-suited for audio, sound, and vibration analysis applications.
The analog inputs offer programmable AC/DC coupling. A programmable
gain amplifier stage on the inputs gives gain selection from -20 to +30 dB
in 10 dB steps. Furthermore, to provide you with the quietest and
highest-quality analog measurements, the input stage accepts
differential or single-ended signal connections.
The National Instruments 4461 and 4462 are high-accuracy data acquisition
devices specifically designed for sound and vibration applications. The
devices include the hardware and software needed to make precision
measurements with microphones, accelerometers, and other transducers
that have very large dynamic ranges. Common applications for the
NI 446x include audio test, automotive test, noise, vibration, and
harshness (NVH) analysis, and machine condition monitoring (MCM).
The NI 446x devices offer a complete range of functionality for sound
and vibration monitoring and analysis applications. With either two inputs
and two outputs, or four inputs, they are ideal for applications where
simultaneous generation and acquisition of noise, vibration, and acoustic
signals are required. You can synchronize the acquisition clock of your
NI 446x with other instruments in your system for mixed-signal
applications. Both analog and digital triggering are available on an NI 446x.
Hardware
Applications
• Audio Test
• Noise, Vibration, and Harshness Test
• Machine Condition Monitoring
• Sound Power
• Structural Vibration
• Pass-by Noise
Figure 1. These 24-bit delta-sigma converters deliver outstanding dynamic range.
24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation
With 118 dB dynamic range and low noise and distortion, NI 446x
devices can make very accurate frequency-domain measurements. They
have excellent amplitude flatness of 0.1 dB within the frequency range
of DC to 92 kHz, and have a typical THD of -107 dB.
TTL/CMOS-compatible and is activated by a choice of rising or falling edge.
Triggering is needed in applications that acquire transient signals. When
performing structural analysis by striking a metal beam with a hammer, for
instance, you measure transient vibrations with accelerometers with
acquisition triggered by the hammer impact.
Antialiasing
The analog inputs have both analog and digital filters implemented in
hardware to prevent aliasing. Input signals are first passed through a fixed
analog filter to remove any signals with frequency components beyond the
range of the ADCs. Then digital antialiasing filters automatically adjust
their cutoff frequency to remove any frequency components above half the
programmed sampling rate.
Calibration
National Instruments calibrates the offset voltage and gain accuracy of the
analog inputs and outputs. An onboard precision voltage reference ensures
that the gain and offset remain stable and accurate. NIST-traceable and
ISO 9002-certified calibration certificates are available on request.
Analog Outputs
NI 4461 devices have two channels of 24-bit resolution, high-fidelity
analog output. A common application of the analog output is to stimulate
a system under test while measuring the frequency response with the
analog inputs. The output conversions occur simultaneously at software-
programmable rates up to 204.8 kS/s. The analog output circuitry uses
8-times oversampling interpolators with 64-times oversampling delta-sigma
modulators to offer exceptional spectral purity. Software-programmable
Figure 2. With application software such as NI LabVIEW, you can conduct
frequency-response, swept-sine, and other common audio measurements.
attenuation of 0, 20, or 40 dB is available on the output channels. NI 4461 Software
devices have excellent amplitude flatness of 0.1 dB within DC to 92 kHz,
NI Measurement Services Software
and a THD of -95 dB at 1 kHz. You can simultaneously acquire data on the
input channels while updating the output channels.
NI 446x devices use NI measurement services software, based on the
NI-DAQmx driver, as the hardware and OS interface. You can build
automated test systems or integrate an NI 446x with other hardware,
including modular instruments and multifunction data acquisition (DAQ)
products, through NI-DAQmx function calls. NI measurement services
software also includes DAQ Assistant, an interactive guide that steps
you through configuring, testing, and programming measurement tasks
and generates the necessary code automatically for National
Anti-Imaging
NI 4461 output channels have both analog and digital anti-imaging
filters. These filters remove the unwanted out-of-band components
generated when an analog signal is produced from digital data.
The digital filters limit the bandwidth of the output signal to half the
original conversion rate, thereby rejecting images caused by the 8-times
oversampling process. The signals generated by the analog output
circuitry are low-distortion, low-noise, flat-frequency analog signals.
Instruments LabVIEW, LabWindows/CVI, or Measurement Studio.
Analysis Software
Multimodule Synchronization
LabVIEW Sound and Vibration Toolkit
For applications requiring more channels, you can synchronize the operation NI 446x devices are well-suited for audio, acoustic, and vibration
of two or more NI 446x devices with less than 0.1 deg phase mismatch.
Synchronization is achieved by sharing a digital trigger and clock between
analysis applications. The LabVIEW Sound and Vibration Toolkit
incorporates Express technology to make it easier for you to perform
multiple modules. The NI-DAQmx driver software automatically handles the sound and vibration measurement and analysis. The toolkit includes
synchronization of multiple devices in a single task.
LabVIEW Express VIs for:
• Fractional-octave analysis with weighting
• Integrated vibration level
• Weighted sound level
• Zoom power spectrum
• Peak search
Triggering
NI 446x devices offer both analog and digital triggering for signal
acquisition. The source of the trigger can come from any analog input
channel, the external digital trigger input, the PXI trigger bus (PXI devices),
or the RTSI bus (PCI devices). The external digital trigger is 5 V
• Power in band
BUY ONLINE at ni.com or CALL (800) 813 3693 (U.S.)
2
24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation
• Power spectrum analysis
for online processing, you can easily create flexible applications for
• Frequency response
condition-based monitoring and predictive maintenance.
• Limit testing
The National Instruments 446x dynamic signal acquisition devices are
ideal for acquiring sound and vibration signals to analyze with this toolkit.
In addition, the LabVIEW Sound and Vibration Toolkit includes
numerous VIs for audio measurements such as gain, phase, distortion,
and swept-sine analysis. Swept-sine is a powerful analysis technique to
measure frequency response. The toolkit also includes simple modular
examples of all of these measurements, so you can quickly combine
analog output, analog input, and data analysis to build a customized
application. In addition, the existing signal generation is extended to
include the tools and examples needed to provide the excitation required
by most audio, noise, and vibration measurements. For example, a library
of 33 waveforms is included in this toolkit to get you up and running fast.
This toolkit also optimizes LabVIEW to perform noise and vibration
measurements. For example, all frequency measurements can perform
zoom FFT analysis to offer improved resolution in the frequency range of
interest. With the built-in fractional-octave analysis, you can perform
measurements with any number of bands at any sampling frequency. NI
446x dynamic signal acquisition devices, combined with this toolkit, offer
compliance with several standards for sound level measurements and
octave analysis:
• IEC 61260 : 1995, class 1
• IEC 61672 : 2002, class 1
• ANSI S1.11 – 2004, class 1
• ANSI S1.4 – 1983
• ANSI S1.42 – 1986
LabVIEW Order Analysis Toolkit
Order analysis is a tool for examining dynamic signals generated by
mechanical systems that include rotating or reciprocating components.
With order analysis you can dissect sound, vibration, and other
dynamic signals into components that relate to physical elements of
mechanical systems.
Ordering Information
PCI
NI PCI-4461............................................................................779307-01
NI PCI-4461 with Sound and Vibration Toolkit ....................779308-01
NI PCI-4462............................................................................779309-01
NI PCI-4462 with Sound and Vibration Toolkit ....................779310-01
The LabVIEW Order Analysis Toolkit is ideal for machine monitoring,
machine health, and machine efficiency applications. You can use the
toolkit to perform the most common analyses required by MCM
applications, including order tracking, slow-roll compensation, and
vibration integration. With this toolkit, you can develop your application
faster by using built-in examples for order spectra, tachometer
processing, and waterfall plots.
PXI
NI PXI-4461............................................................................778442-01
NI PXI-4461 with Sound and Vibration Toolkit ....................779039-01
NI PXI-4462............................................................................779131-01
You can also apply order analysis to dynamic signals generated by
mechanical systems that include rotating or reciprocating components,
such as turbines, compressors, pumps, and engines. It is common to use
order analysis in applications such as machine condition monitoring and
noise, vibration, and harshness (NVH) testing. With the added capability
NI PXI-4462 with Sound and Vibration Toolkit ....................779132-01
Includes NI-DAQmx driver software.
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
24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation
Integrated Electronic Piezoelectric (IEPE)
Current ............................................ 0, 4, or 10 mA,
each channel independently
software-selectable
Compliance ..................................... 24 V min
Channel input impedance
with IEPE enabled............................... 1 MΩ || 240 pF,
pseudodifferential
Specifications
Typical for 25 °C unless otherwise noted.
Analog Input
Number of simultaneously sampled input channels
NI 4461 ...........................................
NI 4462 ...........................................
Input configuration.............................. Differential or pseudodifferential
(50 Ω between negative input
2
4
Current noise ..........................................<300 pA ⁄ Hz
and chassis ground), each
channel independently
Transducer Electronic Data Sheet (TEDS) Compatibility
The PCI-4461, PCI-4462, and PXI-4462 inputs work with transducer
electronic data sheet (TEDS) sensors according to the IEEE 1451
Standard. For more information about TEDS, go to ni.com/info and enter
rdteds.
software-selectable
Input coupling ..................................... AC or DC, each channel
independently software-selectable
A/D converter (ADC) resolution.......... 24 bits
ADC type ............................................. Delta-sigma
Sample rates (fs),
Analog Output (NI 4461)
samples per second (S/s) ................... 1 kS/s to 204.8 kS/s in 181.9 µS/s
increments, maximum
Output Characteristics
Number of output channels................ 2, simultaneously sampled
Output configuration........................... Differential or pseudodifferential
(50 Ω to chassis ground on shield),
Input Signal Ranges
Gain
each channel independently
software-selectable
Log (dB)
-20
-10
Full-Scale Range (Peak)
42.4 V
31.6 V
10.0 V
3.16 V
1.00 V
0.316 V
DAC resolution.................................... 24 bits
DAC type ............................................. Delta-sigma
Update rates (fs) ................................. 1 kS/s to 204.8 kS/s in 181.9 µS/s
increments, maximum
0
+10
+20
+30
1
Attenuation (dB)
Full-Scale Range (Vpk)
Amplifier Characteristics
40
20
0.1
1.0
Input Impedance
Differential Configuration Pseudodifferential Configuration
0
10.0
Between positive input
and chassis ground
1 MΩ || 217 pF
1 MΩ || 217 pF
1Each output channel range is independently software-selectable.
Between negative input
and chassis ground
1 MΩ || 229 pF
50 Ω
Output Signal Range
Voltage Output
Short circuit protection....................... Indefinite protection between
positive and negative
Input coupling ..................................... AC or DC, software-selectable
Common-mode rejection ratio
(CMRR)............................................ 80 dB with 0 dB gain;
up to 105 dB for higher gain
Dynamic Characteristics
Minimum working load....................... 600 Ω
Dynamic Characteristics
Image rejection ................................... 75 dB min < 768 kHz
66 dB min > 768 kHz
Specification
Alias-free bandwidth (BW), (passband)
Alias rejection, minimum
Low-Frequency Alias Rejection Disabled
DC to 0.4535 fs
120 dBc
AO Flatness
AC coupling
20 Hz to 20 kHz............................... 0.008 dB max
20 Hz to 92.1 kHz............................ 0.1 dB max
AO dynamic range............................... 113 dBFS, 0 dB attenuation,
102.5 kS/s (30 kHz bandwidth)
AO THD ............................................... -97 dBc up to 20 kHz
AO interchannel gain mismatch ......... 0.03 dB, 20 Hz to 92.1 kHz
-3 dB cutoff frequency.................... 3.4 Hz
-0.1 dB cutoff frequency................. 22.6 Hz
AI flatness........................................... 0.08 dB, gain ≥0 dB,
20 Hz to 92.2 kHz
AI dynamic range................................ 118 dBFS, 0 dB gain, 51.2 kS/s
THD, balanced source......................... -107 dBc up to 20 kHz,
-104 dBc up to 92.2 kHz
Crosstalk (channel separation) ........... -138 dB at 1 kHz
AI interchannel gain mismatch........... 0.003 dB up to 92.2 kHz
Internal Frequency Timebase Characteristics
Accuracy.............................................. 20 ppm, over operating
temperature range
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4
24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation
Triggers
Analog Trigger
Source ................................................. AI0, AI1
Level.................................................... full-scale
Slope ................................................... Positive or negative
(software-selectable)
Resolution ........................................... 24 bits
Hysteresis............................................ Programmable
Digital Trigger
Compatibility....................................... 5 V TTL
Polarity ................................................ Rising or falling edge
Pulse width ......................................... 10 ns minimum
Source ................................................. SMB (PFIO), PXI trigger bus,
RTSI bus
Certifications and Compliances
CE Mark Compliance
For a complete listing of all NI 446x specifications, please visit
ni.com/soundandvibration.
BUY ONLINE at ni.com or CALL (800) 813 3693 (U.S.)
5
NI Services and Support
NI has the services and support to meet
Local Sales and Technical Support
your needs around the globe and through
the application life cycle – from planning
and development through deployment
and ongoing maintenance. We offer
services and service levels to meet
customer requirements in research,
design, validation, and manufacturing.
Visit ni.com/services.
In offices worldwide, our staff is local to the country, giving you access
to engineers who speak your language. NI delivers industry-leading
technical support through online knowledge bases, our applications
engineers, and access to 14,000 measurement and automation
professionals within NI Developer Exchange forums. Find immediate
answers to your questions at ni.com/support.
SERVICE
NEEDS
We also offer service programs that provide automatic upgrades to
your application development environment and higher levels of technical
support. Visit ni.com/ssp.
Training and Certification
NI training is the fastest, most certain route to productivity with our
products. NI training can shorten your learning curve, save development
time, and reduce maintenance costs over the application life cycle. We
schedule instructor-led courses in cities worldwide, or we can hold a
course at your facility. We also offer a professional certification program
Hardware Services
NI Factory Installation Services
NI Factory Installation Services (FIS) is the fastest and easiest way to
use your PXI or PXI/SCXI combination systems right out of the box.
that identifies individuals who have high levels of skill and knowledge on Trained NI technicians install the software and hardware and configure
using NI products. Visit ni.com/training.
the system to your specifications. NI extends the standard warranty by
one year on hardware components (controllers, chassis, modules)
purchased with FIS. To use FIS, simply configure your system online with
Professional Services
Our Professional Services Team is comprised of NI applications engineers, ni.com/pxiadvisor.
NI Consulting Services, and a worldwide National Instruments Alliance
Calibration Services
Partner program of more than 600 independent consultants and
integrators. Services range from
start-up assistance to turnkey
NI recognizes the need to maintain properly calibrated devices for
high-accuracy measurements. We provide manual calibration
procedures, services to recalibrate your products, and automated
calibration software specifically designed for use by metrology
laboratories. Visit ni.com/calibration.
system integration.
Visit ni.com/alliance.
OEM Support
We offer design-in consulting and product integration assistance if you
want to use our products for OEM applications. For information about
special pricing and services for OEM customers, visit ni.com/oem.
Repair and Extended Warranty
NI provides complete repair services for our products. Express repair
and advance replacement services are also available. We offer
extended warranties to help you meet project life-cycle requirements.
Visit ni.com/services.
ni.com • (800) 813 3693
*351332A-01*
351332A-01
2006-6904-301-101-D
National Instruments • info@ni.com
© 2006 National Instruments Corporation. All rights reserved. CVI, LabVIEW, Measurement Studio, National Instruments, National Instruments Alliance Partner, NI, ni.com,
RTSI, and SCXI are trademarks of National Instruments. Other product and company names listed are trademarks or trade names of their respective companies.
A National Instruments Alliance Partner is a business entity independent from NI and has no agency, partnership, or joint-venture relationship with NI.
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