24-Bit, 102.4 kS/s, 8 and 4-Channel

Dynamic Signal Acquisition

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

The offset voltage and gain accuracy of the analog input are

calibrated by National Instruments. An onboard precision voltage

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 bus-

master 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.

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.

Figure 2. In an 18-slot PXI chassis with 14 PXI-4472 modules, you can have up to

112 simultaneously sampled analog inputs.

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