24-Bit, 204.8 kS/s Dynamic Signal Acquisition and Generation
NI 4461, NI 4462
• 2 or 4 simultaneously sampled
analog inputs
• 2 simultaneously updated
analog outputs (NI 4461 only)
• 118 dB dynamic range, 24-bit resolution
• 204.8 kS/s maximum sampling rate
• 92 kHz alias-free bandwidth
• Input range from ±316 mV to 42.4 V
• 6 gain settings
• AC/DC coupling
• Antialiasing and anti-imaging protection
• IEPE conditioning – software-configurable
• Multimodule synchronization
Operating Systems
• Windows 2000/NT/XP
Recommended Software
• LabVIEW
• LabVIEW Real-Time Module
• LabVIEW Sound and
Vibration Toolkit
• LabVIEW Order Analysis Toolkit
• LabWindows/CVI
• Measurement Studio
Measurement Services Software
(included)
• NI-DAQmx
Calibration Certificate Available
Product
NI 4461
NI 4462
Bus
PXI, PCI
PXI, PCI
Analog
Input
Sampling
Inputs Resolution
Rate
2
24 bits
204.8 kS/s
4
24 bits
204.8 kS/s
Input
Range
±316 mV to 42.4 V
±316 mV to 42.4 V
Input
Configuration
Differential/pseudodifferential
Differential/pseudodifferential
Analog
Outputs
2
0
Output
Resolution
24 bits
–
Update
Rate
204.8 kS/s
–
Output
Triggering
Range
±100 mV to 10 V Analog/digital
–
Analog/digital
Table 1. NI 446x Channel, Speed, and Resolution Specifications
Overview
The National Instruments 4461 and 4462 are high-accuracy data acquisition
devices specifically designed for sound and vibration applications. The
devices include the hardware and software needed to make precision
measurements with microphones, accelerometers, and other transducers
that have very large dynamic ranges. Common applications for the
NI 446x include audio test, automotive test, noise, vibration, and
harshness (NVH) analysis, and machine condition monitoring (MCM).
The NI 446x devices offer a complete range of functionality for sound
and vibration monitoring and analysis applications. With either two inputs
and two outputs, or four inputs, they are ideal for applications where
simultaneous generation and acquisition of noise, vibration, and acoustic
signals are required. You can synchronize the acquisition clock of your
NI 446x with other instruments in your system for mixed-signal
applications. Both analog and digital triggering are available on an NI 446x.
Analog Inputs
The analog input channels of NI 446x devices have 24-bit resolution ADCs
that are simultaneously sampled at software-programmable rates for
standard audio applications, such as 44.1 kS/s (the standard rate used in
CD players), 48.0 kS/s (the rate used in digital audio tape (DAT) recorders
and other digital audio equipment), 96.0 kS/s, and 192 kS/s. An NI 446x is
well-suited for audio, sound, and vibration analysis applications.
The analog inputs offer programmable AC/DC coupling. A programmable
gain amplifier stage on the inputs gives gain selection from -20 to +30 dB
in 10 dB steps. Furthermore, to provide you with the quietest and
highest-quality analog measurements, the input stage accepts
differential or single-ended signal connections.
Hardware
Applications
•
•
•
•
•
•
Audio Test
Noise, Vibration, and Harshness Test
Machine Condition Monitoring
Sound Power
Structural Vibration
Pass-by Noise
Figure 1. These 24-bit delta-sigma converters deliver outstanding dynamic range.
NI [ NATIONAL INSTRUMENTS CORPORATION ]
