NI4472

24-Bit, 102.4 kS/s, 8 and 4-Channel Dynamic Signal Acquisition NI 4472 Series, NI PCI-4474 • 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 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 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 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 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 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. 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. 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. 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. 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. 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 Calibration 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 • info@ni.com • ni.com 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 sampled 4, simultaneously sampled Unbalanced differential 24 bits, nominal Delta-sigma 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 Signal Conditioning Constant current source (software-controlled) Current.............................................................. Compliance....................................................... Output impedance ............................................ Current noise .................................................... 4 mA, ±5% 24 V >250 kΩ at 1 kHz 60 dB, minimum Power Requirements +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 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 ..............................................