NI NIPCI-4474 24-bit, 102.4 ks/s, 8 and 4-channel dynamic signal acquisition Datasheet

24-Bit, 102.4 kS/s, 8 and 4-Channel
Dynamic Signal Acquisition
NI 4472 Series, NI PCI-4474
Operating Systems
• 24-bit resolution
• 110 dB dynamic range
• 102.4 kS/s maximum
sampling rate
• 45 kHz alias-free bandwidth
• ±10 V range
• AC/DC coupling
• IEPE conditioning –
software configurable
• Multiple-device synchronization
• 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
Device
NI 4472
NI 4472B
NI 4474
Bus
PCI, PXI
PXI
PCI
Analog
Inputs
8
8
4
Resolution
24 bits
24 bits
24 bits
Sampling
Rate
102.4 kS/s
102.4 kS/S
102.4 kS/S
Input
AC Cutoff
Range
Triggering
Frequency
±10 V Analog and digital
3.4 Hz
±10 V Analog and digital
0.5 Hz
±10 V Analog and digital
3.4 Hz
Table 1. NI 447x Channel, Speed, and Resolution Specifications
Overview
The National Instruments PCI-4472 and PXI-4472 are 8-channel
dynamic signal acquisition devices for making high-accuracy audiofrequency measurements. The NI PCI-4474 is a similar 4-channel
board. The vibration-optimized PXI-4472B offers a lower AC
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 highchannel-count applications, or with other modules using the PXI star
trigger bus or the RTSI bus on PCI. When used with the Sound and
Vibration Toolkit or other software analysis tools, an NI 447x can
obtain a variety of accurate time and frequency measurements for
your application.
dynamic range greater than 110 dB can be Applications
Noise and vibration diagnostics
achieved. Using state-of-the-art delta-sigma Audio test and measurement
modulating ADCs, the NI 447x devices Machine condition monitoring
Sound power
achieve low noise and low distortion. Telecommunications testing
Because these ADCs use a 1-bit quantizer Structural vibration
Pass-by noise
oversampled at a multiple of the specified
sampling rate, they produce extraordinary linearity. Extremely flat,
linear-phase, lowpass digital filters then remove aliases and shape the
quantization noise from the band of interest. Using the delta-sigma
modulating ADCs, an NI 447x is immune to the DNL distortion
associated with conventional data acquisition devices.
>110 dB (24-bit)
Hardware
Analog Inputs
Figure 1. The 24-bit architecture of the NI 447x devices deliver more than 110 dB dynamic
NI 447x devices have four or eight analog inputs with 24-bit
resolution ADCs that are simultaneously sampled at a softwareprogrammable rate. The high resolution provides the necessary
accuracy to make NI 447x devices well suited for audio and vibration
analysis 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
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 filters
implemented in hardware to prevent aliasing. Input signals are first
passed through fixed analog filters to remove any signals with
frequency components beyond the range of the 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 DC
specifications. NIST-traceable and ISO-9002-certified calibration
certificates are available online.
PXI/PCI Interface
NI 447x devices use the PCI mini-MITE to deliver full DMA busmaster data transfer rates of 20 to 30 MB/s and burst rates up to
132 MB/s. A 1,024-sample, analog input FIFO prevents data loss if
DMA 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.
antialiasing filters automatically adjust their cutoff frequency to
remove any frequency components above half the programmed
sampling rate. This advanced analog input design frees you from
adding additional external filters to prevent aliasing.
Multidevice Synchronization
For applications requiring high channel counts, you can synchronize
the operation of two or more NI 447x devices. Using the PXI star
trigger bus, you can send and receive timing signals between
PXI-447x modules. Synchronization is achieved by sharing a digital
trigger from one device and synchronizing all devices to the same
clock. The PXI star trigger bus, as defined by the PXI Specification,
ensures synchronization between modules with less than 1 ns of
skew, which enables a system to have 0.1 deg phase mismatch for a
1 kHz signal between any two channels across devices in the same
chassis. Low phase mismatch is critical in obtaining phase
information from cross-channel measurements in many
applications. In the 18-slot PXI-1045 chassis, you can synchronize up
to 14 PXI-4472 modules to have up to 112 simultaneously sampled
analog inputs. Using the RTSI bus, two or more PCI-4472 or PCI-4474
boards can be synchronized as well.
Triggering
NI 447x devices have two trigger modes for acquiring signals.
Pretrigger mode digitizes signals before and after a trigger condition
occurs. Posttrigger mode digitizes signals after a trigger condition
occurs. The source of the trigger can come from any analog input
channel, the external digital trigger input, the PXI trigger bus or
RTSI bus, or through software. The external digital trigger is 5 V
TTL/CMOS-compatible and is activated by a choice of rising or falling
edge. Triggering is needed in applications such as those that acquire
transient signals. For example, when measuring transient vibrations
resulting from striking a mechanical structure with a hammer,
acquisition of accelerometer signals is triggered by hammer impact.
Calibration
Measurement Services Software
NI 447x devices use NI-DAQmx as the hardware and operating
system interface. You can build automated test systems or integrate
an NI 447x with other hardware, including multifunction DAQ
products, through NI-DAQ function calls for LabVIEW,
LabWindows/CVI, and Measurement Studio.
Because of bandwidth, NI 447x devices are well suited for
applications in audio and vibration analysis. These applications are
specifically addressed in the Sound and Vibration Toolkit and the
Order Analysis Toolkit for LabVIEW. Using these toolkits in
conjunction with NI 447x devices, you can produce power spectra,
frequency responses, fractional-octave analysis, sound-level
measurements, order spectra, order maps, and order extraction.
A typical setup for an environmental noise and vibration
measurement application would use one or more PXI-4472 modules,
a PXI chassis and controller, LabVIEW, and the Sound and
Vibration Toolkit.
Ordering Information
NI PCI-4472 ..................................................................778348-01
NI PCI-4472 with Sound and Vibration Toolkit ........778663-01
NI PCI-4474 ..................................................................778729-01
NI PCI-4474 with Sound and Vibration Toolkit ........778778-01
NI PXI-4472 ..................................................................778279-01
NI PXI-4472 with Sound and Vibration Toolkit ........778664-01
NI PXI-4472B ................................................................778279-02
NI PXI-4472B with Sound and Vibration Toolkit ......778664-02
Includes NI-DAQ software.
Accessories
SMB100, SMB female to BNC female
Qty 1 ..........................................................................763389-01
Qty 8 ..........................................................................778415-01
SMB110, SMB female to BNC male
Qty 1 ..........................................................................763405-01
Qty 8 ..........................................................................778414-01
BUY ONLINE!
For complete product specifications, pricing, and accessory
information, call (800) 813-3693 (U.S. only) or go to
ni.com/modularinstruments
The offset voltage and gain accuracy of the analog input are
calibrated by National Instruments. An onboard precision voltage
2
National Instruments • Tel: (800) 433-3488 • Fax: (512) 683-9300 • [email protected] • ni.com
24-Bit, 8-Channel Dynamic Signal Acquisition
Specifications
Typical for 25 °C unless otherwise noted.
Analog Input
Signal Conditioning
Constant current source (software-controlled)
Current..............................................................
Compliance.......................................................
Output impedance ............................................
Current noise ....................................................
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 sampled
4, simultaneously sampled
Unbalanced differential
24 bits, nominal
Delta-sigma
Triggers
Analog Trigger
128 ƒs
64 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 peak
1,024 samples
DMA
Transfer Characteristics
Offset (residual DC).......................................... ±3 mV, max
Gain (amplitude accuracy)................................ ±0.1 dB, max, ƒin = 1 kHz
Source...............................................................
Level .................................................................
Slope.................................................................
Resolution.........................................................
Hysteresis.........................................................
CH<0..7>
-10 to +10 V, full scale, programmable
Positive or negative (software selectable)
24 bits, nominal
Programmable
Digital Trigger
Compatibility .................................................... 5 V TTL/CMOS
Response .......................................................... Rising or falling edge
Pulse width....................................................... 10 ns, minimum
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..................................................
4 mA, ±5%
24 V
>250 kΩ at 1 kHz
<500 pA/√Hz
Power Requirements
1 MΩ in parallel with 60 pF
50 Ω in parallel with 0.02 µF
±0.1 dB, DC to 0.4535 ƒs, max, DC-coupled
0.4863 ƒs
AC or DC, software-selectable
3.4 Hz
0.5 Hz
±42.4 V
CH<0..7>
Not protected, rated at ±2.5 V
>60 dB, minimum
+3.3 VDC
PXI..............................................................
+5 VDC
PCI..............................................................
PXI..............................................................
+12 VDC............................................................
-12 VDC ............................................................
400 mA, maximum
2.6 A, maximum
2.2 A, maximum
120 mA, maximum
120 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 male
SMB male
Dynamic Characteristics
Maximum Working Voltage
Alias-free bandwidth (passband)..................... DC (0 Hz) to 0.4535 ƒs
Stop band ......................................................... 0.5465 ƒs
Alias 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 = 1kHz
0 dBFS input .............................................. <-90 dB
20 dBFS input ............................................ <-100 dB
60 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 7
Shorted input ...................................... <-90 dB
1 kΩ load............................................ <-80 dB
Other channel combinations
Shorted input ...................................... <-100 dB
1 kΩ load............................................ <-90 dB
Phase linearity.................................................. <±0.5 deg
Interchannel phase mismatch.......................... <ƒin (in kHz) x 0.018 deg + 0.082 deg
Interchannel gain mismatch............................. ±0.1 dB
Filter delay through ADC.................................. 38.8 sample periods
Maximum working voltage refers to the signal voltage plus the common-mode voltage.
Channel-to-earth .............................................. 10 V, installation category I
Channel-to-channel .......................................... 10 V, installation category I
Onboard Calibration Reference
DC level ............................................................ 5.000 V ±2.5 mV
Temperature coefficient ................................... ±5 ppm/°C maximum
Long-term stability ........................................... ±20 ppm/√1,000 h
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%, noncondensing
2,000 m
2
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 memory
Interval....................................................... 1 year
Warm-up time .................................................. 15 minutes
Certifications and Compliances
CE Mark Compliance
1Measured
with full-scale (±10 V) input.
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3
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