NI PXI-4461 186900T-11L Acquisition & Generation Module

NI PXI-4461 with part number 186900T-11L is a high-performance 24-bit dynamic signal acquisition (DSA) module from National Instruments. It integrates 2 simultaneous analog input channels and 2 analog output channels, supporting IEPE sensor excitation for sound, vibration and frequency response testing.

This module supports sampling rates up to 204.8 kS/s, AC/DC coupling selection and multiple gain settings. It features excellent dynamic range and low distortion, fully compatible with LabVIEW and DAQmx drivers. It serves as critical spare parts for NVH test benches, audio measurement and machinery condition monitoring system maintenance and upgrade projects.

Main Specifications

1. Brand: NI (National Instruments); Model: PXI-4461; Part No:186900T-11L; Type: PXI Dynamic Signal Module
2. Resolution:24-bit Delta-Sigma ADC & DAC; Sample Rate:1kS/s ~ 204.8kS/s
3. Channels:2 simultaneous AI + 2 simultaneous AO; Supports IEPE 4mA constant current excitation
4. Signal Coupling:Software selectable AC/DC; Dynamic Range:118 dBFS for analog input
5. Interface:BNC connectors; Bus:PXI bus; Software:LabVIEW, NI DAQmx driver
6. Operating Temperature:0℃ ~ +55℃; Standard 3U PXI card form factor
7. Supply Status:Industrial spare DSA module for vibration and acoustic test system overhaul and replacement

Core Functions

1. Simultaneously capture vibration and acoustic signals from IEPE accelerometers and microphones.
2. Generate high-precision arbitrary waveform signals for excitation testing and frequency response measurement.
3. Software configurable AC/DC coupling and gain to adapt different signal amplitude and frequency ranges.
4. High dynamic range and low THD performance, ensuring accurate spectrum analysis and noise measurement.
5. PXI trigger and clock synchronization, supporting multi-module expansion for multi-channel test systems.
6. 3U PXI standard form factor, easy installation and fast replacement inside PXI chassis during maintenance.

Application Scenarios

1. Sound and vibration measurement unit for NI PXI modular dynamic signal testing systems.
2. Fault module replacement and routine maintenance of existing NI PXI DSA test platforms.
3. Automotive NVH testing, audio device inspection, machinery vibration monitoring and modal analysis projects.
4. Emergency replacement for module failure to restore signal acquisition and waveform generation function.
5. Spare parts stocking for maintenance teams supporting NI PXI and LabVIEW test automation systems.
6. Aftermarket spare supply for test bench upgrade and acoustic & vibration measurement system reconstruction.

FAQ

1. Q: What is NI PXI-4461 186900T-11L used for?
   A: It is a 24-bit dynamic signal acquisition and generation module, used for vibration, noise and frequency response tests with IEPE sensors.
2. Q: What are typical module failure symptoms?
   A: No signal input/output, abnormal noise floor, channel distortion, synchronization error, DAQmx device recognition failure.
3. Q: How to complete commissioning and diagnosis?
   A: Insert module into PXI chassis, connect BNC signal cables, install NI DAQmx driver, configure IEPE power and test signals via LabVIEW.