NIPCI-4474 NI [National Instruments Corporation], NIPCI-4474 Datasheet

NIPCI-4474

Manufacturer Part Number

NIPCI-4474

Description

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

Manufacturer

NI [National Instruments Corporation]

Datasheet

1.NIPCI-4474.pdf (4 pages)

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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 audio-

frequency 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

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 high-

channel-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.

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 necessary

accuracy to make NI 447x devices well suited for audio and vibration

analysis applications.

For example, when sampling at 51.2 kS/s and using a 16 k FFT, a

Device

NI 4472

NI 4472B

NI 4474

Outstanding measurements can be achieved with an NI 447x.

NI 4472 Series, NI PCI-4474

• 24-bit resolution

• 110 dB dynamic range

• 102.4 kS/s maximum

• 45 kHz alias-free bandwidth

• ±10 V range

• AC/DC coupling

• IEPE conditioning –

• Multiple-device synchronization

sampling rate

software configurable

PCI, PXI

Bus

PXI

PCI

Piezoelectric

Analog

Inputs

Resolution

24 bits

(IEPE)

102.4 kS/S

102.4 kS/s

Sampling

Rate

signal

Range

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

Input

±10 V

Operating Systems

• Windows 2000/NT/XP

• LabVIEW Real-Time

• Mac OS X

Recommended Software

• LabVIEW

• LabVIEW Sound and

• LabVIEW Order

• LabWindows/CVI

• Measurement Studio

Measurement Services

Software (included)

• NI-DAQmx

Analog and digital

conditioning

Vibration Analysis Toolkit

Analysis Toolkit

Triggering

Dynamic Signal Acquisition

Frequency

AC Cutoff

3.4 Hz

0.5 Hz

3.4 Hz

for

dynamic range greater than 110 dB can be

achieved. Using state-of-the-art delta-sigma

modulating ADCs, the NI 447x devices

achieve low noise and low distortion.

Because these ADCs use a 1-bit quantizer

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.

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

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.

>110 dB (24-bit)

Applications

Noise and vibration diagnostics

Audio test and measurement

Machine condition monitoring

Sound power

Telecommunications testing

Structural vibration

Pass-by noise

Related parts for NIPCI-4474

NIPCI-4474 Summary of contents

Page 1

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 ...

Dynamic Signal Acquisition Figure 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 ...

Page 3

Dynamic Signal Acquisition Specifications Typical for 25 °C unless otherwise noted. Analog Input Channel Characteristics Number of channels NI 4472 Series........................................... 8, simultaneously sampled NI 4474 Series........................................... 4, simultaneously sampled Input configuration ........................................... Unbalanced differential Resolution......................................................... 24 bits, ...

Page 4

NI Services and Support NI has the services and support to meet 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 ...

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NIPCI-4474 NI [National Instruments Corporation], NIPCI-4474 Datasheet

NIPCI-4474

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