Dynamic Signal Acquisition
NI 4472 Series, NI PCI-4474
•24-bit resolution
•110 dB dynamic range•102.4 kS/s maximumsampling rate
•45 kHz alias-free bandwidth•±10 V range•AC/DC coupling•IEPE conditioning – software configurable
•Multiple-device synchronization
Operating Systems
•Windows 2000/NT/XP•LabVIEW Real-Time •Mac OS X
Recommended Software
•LabVIEW
•LabVIEW Sound and Vibration Analysis Toolkit •LabVIEW Order Analysis Toolkit•LabWindows/CVI•Measurement Studio
Measurement Services Software (included)
•NI-DAQmx
dynamic range greater than 110 dB can beApplications
Noise and vibration diagnostics
achieved.Using state-of-the-art delta-sigmaAudio test and measurementmodulating ADCs,the NI447x devicesMachine condition monitoring
Sound power
achieve low noise and low distortion.Telecommunications testing
Table 1. NI 447x Channel, Speed, and Resolution Specifications
Because these ADCs use a 1-bit quantizerStructural vibration
Pass-by noise
oversampled at a multiple ofthe specified
Overviewsampling rate,they produce extraordinary linearity.Extremely flat,The National Instruments PCI-4472 and PXI-4472 are 8-channellinear-phase,lowpass digital filters then remove aliases and shape thedynamic signal acquisition devices for making high-accuracy audio-quantization noise from the band ofinterest.Using the delta-sigmafrequency measurements.The NI PCI-4474 is a similar 4-channelmodulating ADCs,an NI 447x is immune to the DNL distortionboard.The vibration-optimized PXI-4472B offers a lower AC associated with conventional data acquisition devices.cutofffrequency of0.5 Hz.Input channels incorporate IntegratedElectronic Piezoelectric (IEPE) signal conditioning foraccelerometers and microphones.The input channels ofan NI447xsimultaneously digitize input signals over a bandwidth from DC to45 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 andVibration Toolkit or other software analysis tools,an NI447x canobtain a variety ofaccurate time and frequency measurements foryour application.
DeviceNI 4472NI 4472BNI 4474
BusPCI, PXIPXIPCI
AnalogInputs884
Resolution24 bits24 bits24 bits
SamplingRate102.4 kS/s102.4 kS/S102.4 kS/S
InputAC CutoffRangeTriggeringFrequency±10 VAnalog and digital3.4 Hz±10 VAnalog and digital0.5 Hz±10 VAnalog and digital3.4 Hz
Hardware
Analog Inputs
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 necessaryaccuracy to make NI 447x devices well suited for audio and vibrationanalysis applications.
Outstanding measurements can be achieved with an NI 447x.For example,when sampling at 51.2 kS/s and using a 16 k FFT,a
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.
Antialiasing
The analog inputs have both analog and real-time digital filtersimplemented in hardware to prevent aliasing.Input signals are firstpassed through fixed analog filters to remove any signals withfrequency components beyond the range ofthe ADCs;then digital
24-Bit, 102.4 kS/s, 8 and 4-Channel Dynamic Signal Acquisition
reference is used for internal calibration to ensure stable,accurate DCspecifications.NIST-traceable and ISO-9002-certified calibrationcertificates are available online.
PXI/PCI Interface
NI 447x devices use the PCI mini-MITE to deliver full DMA bus-master data transfer rates of20 to 30 MB/s and burst rates up to132MB/s.A 1,024-sample,analog input FIFO prevents data loss ifDMA or interrupt service latency is long.
Figure 2. In an 18-slot PXI chassis with 14 PXI-4472 modules, you can have up to 112 simultaneously sampled analog inputs.
Measurement Services Software
NI 447x devices use NI-DAQmx as the hardware and operatingsystem interface.You can build automated test systems or integratean NI 447x with other hardware,including multifunction DAQproducts,through NI-DAQ function calls for LabVIEW,LabWindows/CVI,and Measurement Studio.
Because ofbandwidth,NI 447x devices are well suited forapplications in audio and vibration analysis.These applications arespecifically addressed in the Sound and Vibration Toolkit and theOrder Analysis Toolkit for LabVIEW.Using these toolkits inconjunction with NI 447x devices,you can produce power spectra,frequency responses,fractional-octave analysis,sound-levelmeasurements,order spectra,order maps,and order extraction.A typical setup for an environmental noise and vibrationmeasurement application would use one or more PXI-4472 modules,a PXI chassis and controller,LabVIEW,and the Sound and Vibration Toolkit.
antialiasing filters automatically adjust their cutofffrequency toremove any frequency components above halfthe programmedsampling rate.This advanced analog input design frees you fromadding additional external filters to prevent aliasing.
Multidevice Synchronization
For applications requiring high channel counts,you can synchronizethe operation oftwo or more NI 447x devices.Using the PXI startrigger bus,you can send and receive timing signals betweenPXI-447x modules.Synchronization is achieved by sharing a digitaltrigger from one device and synchronizing all devices to the sameclock.The PXI star trigger bus,as defined by the PXI Specification,ensures synchronization between modules with less than 1 ns ofskew,which enables a system to have 0.1 deg phase mismatch for a 1 kHz signal between any two channels across devices in the samechassis.Low phase mismatch is critical in obtaining phaseinformation from cross-channel measurements in manyapplications.In the 18-slot PXI-1045 chassis,you can synchronize upto 14 PXI-4472 modules to have up to 112 simultaneously sampledanalog inputs.Using the RTSI bus,two or more PCI-4472 or PCI-4474boards can be synchronized as well.
Ordering Information
Triggering
NI 447x devices have two trigger modes for acquiring signals.Pretrigger mode digitizes signals before and after a trigger conditionoccurs.Posttrigger mode digitizes signals after a trigger conditionoccurs.The source ofthe trigger can come from any analog inputchannel,the external digital trigger input,the PXI trigger bus or RTSI bus,or through software.The external digital trigger is 5 VTTL/CMOS-compatible and is activated by a choice ofrising or fallingedge.Triggering is needed in applications such as those that acquiretransient signals.For example,when measuring transient vibrationsresulting from striking a mechanical structure with a hammer,acquisition ofaccelerometer signals is triggered by hammer impact.
NI PCI-4472..................................................................778348-01NI PCI-4472 with Sound and Vibration Toolkit........778663-01NI PCI-4474..................................................................778729-01NI PCI-4474 with Sound and Vibration Toolkit........778778-01NI PXI-4472..................................................................778279-01NI PXI-4472 with Sound and Vibration Toolkit........778664-01NI PXI-4472B................................................................778279-02NI PXI-4472B with Sound and Vibration Toolkit......778664-02
Includes NI-DAQ software.
Accessories
SMB100,SMB female to BNC female
Qty 1..........................................................................763389-01Qty 8..........................................................................778415-01SMB110,SMB female to BNC male
Qty 1..........................................................................763405-01Qty 8..........................................................................778414-01
BUYONLINE!
For complete product specifications,pricing,and accessory information,call (800) 813-3693 (U.S.only) or go toni.com/modularinstruments
Calibration
The offset voltage and gain accuracy ofthe analog input arecalibrated by National Instruments.An onboard precision voltage
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24-Bit, 8-Channel Dynamic Signal Acquisition
Specifications
Typical for 25 °C unless otherwise noted.
Analog Input
Channel Characteristics
Number of channels
NI 4472 Series...........................................NI 4474 Series...........................................Input configuration...........................................Resolution.........................................................Type of ADC......................................................Oversampling, for sample rate (ƒs):
1.0 kS/s ≤ƒs≤51.2 kS/s..........................51.2 kS/s < ƒs≤102.4 kS/s......................Sample rates (ƒs)..............................................Frequency accuracy..........................................Input signal range............................................FIFO buffer size.................................................Data transfers..................................................
8, simultaneously sampled4, simultaneously sampledUnbalanced differential24 bits, nominalDelta-sigma
128 ƒs64 ƒs
1.0 to 102.4 kS/s in 190.7 µS/s increments for
ƒs> 51.2 kS/s or 95.36 µS/s increments for ƒs≤51.2 kS/s±25 ppm±10 V peak1,024 samplesDMA
Signal Conditioning
Constant current source (software-controlled)Current..............................................................Compliance.......................................................Output impedance............................................Current noise....................................................
4 mA, ±5%24 V
>250 kΩat 1 kHz<500 pA/√HzTriggers
Analog Trigger
Source...............................................................Level.................................................................Slope.................................................................Resolution.........................................................Hysteresis.........................................................
CH<0..7>
-10 to +10 V, full scale, programmablePositive or negative (software selectable)24 bits, nominalProgrammable
Digital Trigger
Compatibility....................................................5 V TTL/CMOS
Response..........................................................Rising or falling edgePulse width.......................................................10 ns, minimum
Transfer Characteristics
Offset (residual DC)..........................................±3 mV, max
Gain (amplitude accuracy)................................±0.1 dB, max, ƒin= 1 kHz
Bus Interface
Type..................................................................Master, slave
Amplifier Characteristics
Input impedance (ground referenced)
Positive input....................................................Negative input (shield).....................................Flatness (relative to 1 kHz)...............................-3 dB bandwidth...............................................Input coupling...................................................AC -3 dB cutoff frequency
NI 4472, NI 4474.......................................NI 4472B....................................................Overvoltage protection
Positive input.............................................Positive inputs protected...........................Negative input (shield)..............................Common mode rejection ratio (CMRR)
ƒin< 1 kHz..................................................
1 MΩin parallel with 60 pF50 Ωin parallel with 0.02 µF
±0.1 dB, DC to 0.4535 ƒs, max, DC-coupled0.4863 ƒs
AC or DC, software-selectable3.4 Hz0.5 Hz
±42.4 VCH<0..7>
Not protected, rated at ±2.5 V>60 dB, minimum
Power Requirements
+3.3 VDC
PXI..............................................................+5 VDC
PCI..............................................................PXI..............................................................+12 VDC............................................................-12 VDC............................................................
400 mA, maximum2.6 A, maximum2.2 A, maximum120 mA, maximum120 mA, maximum
Physical
Dimensions (not including connectors)
PCI..............................................................PXI..............................................................Analog I/O connectors.....................................Digital trigger connector..................................
17.5 by 10.7 cm (6.9 by 4.2 in.)
16.0 by 9.9 cm (6.3 by 3.9 in.) (1 slot)SMB maleSMB male
Dynamic Characteristics
Alias-free bandwidth (passband).....................DC (0 Hz) to 0.4535 ƒsStop band.........................................................0.5465 ƒsAlias rejection..................................................110 dB
Spurious-free dynamic range...........................130 dB, 1.0 kS/s ≤ƒs≤51.2 kS/s,118 dB, 51.2 kS/s < ƒs≤102.4 kS/s THD, ƒin= 1kHz0 dBFS input..............................................<-90 dB20 dBFS input............................................<-100 dB60 dBFS input............................................<-60 dB
IMD...................................................................<-100 dB (CCIF 14 kHz + 15 kHz)Crosstalk1(channel separation), ƒin= 0 to 51.2 kHz
Between channels 0 and 1, 2 and 3, 4 and 5, or 6 and 7Shorted input......................................<-90 dB1 kΩload............................................<-80 dBOther channel combinations
Shorted input......................................<-100 dB1 kΩload............................................<-90 dBPhase linearity..................................................<±0.5 deg
Interchannel phase mismatch..........................<ƒin(in kHz) x 0.018 deg + 0.082 degInterchannel gain mismatch.............................±0.1 dB
Filter delay through ADC..................................38.8 sample periods
Maximum Working Voltage
Maximum working voltage refers to the signal voltage plus the common-mode voltage.Channel-to-earth..............................................10 V, installation category IChannel-to-channel..........................................10 V, installation category I
Environmental
Operating temperature.....................................Storage temperature........................................Relative humidity.............................................Maximum altitude............................................Pollution degree (indoor use only)...................
0 to 50 °C-20 to 70 °C
10 to 90%, noncondensing2,000 m2
Calibration
Internal – On software command; computes gain and offset corrections
Interval.......................................................Whenever temperature is different from temperature at
last internal calibration by more than ±5 °C
External – Internal voltage reference read and stored in nonvolatile memoryInterval.......................................................1 yearWarm-up time..................................................15 minutes
Certifications and CompliancesCE Mark Compliance
1Measured with full-scale (±10 V) input.
Onboard Calibration Reference
DC level............................................................5.000 V ±2.5 mVTemperature coefficient...................................±5 ppm/°C maximumLong-term stability...........................................±20 ppm/√1,000 h
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