NoiseCheck is a cost-effective software-based system for measuring noise and vibration of motors, fans, gears, bearings, pumps and other electromechanical products.
NoiseCheck ‘listens’ to the product and quantifies both the level and frequency of the noise to ensure that they are within pre-set limits. It can simultaneously carry out time domain analysis for transient noise and frequency domain analysis for steady-state noise, replicating the human ear’s ability to hear both types of noise at once. It offers many advantages over human listeners, such as detailed fault detection analysis, clearly displaying the type and magnitude of the fault, automatic saving of data for later analysis, automated record keeping / part traceability, and can easily be integrated as part of an automated production line. NoiseCheck can also be used in the R&D lab to aid in the design of quiet products.
Operation is simple. The device under test is powered up, either using DC connect, a power supply that integrates with NoiseCheck for automated testing, (for devices requiring a power supply less that 10V DC) or an external source, and Noisecheck records the noise it produces via a microphone. If it is preferable to measure vibration rather than sound, an accelerometer or a laser vibrometer may be used instead of the microphone. For testing run up/down and variable speed products such as some fans, DC Connect can be programmed via NoiseCheck to ramp voltage up/down.
Recording is started either manually (remotely) by an operator, or triggered at a given level. A spectrum analysis is performed on the recorded noise, and it is compared to pre-set limits which may either be based on a reference unit, or entered manually. NoiseCheck offers two options for analyzing the signal from the DUT. The Scope-FFT includes a spectrum analyzer for measuring high resolution FFTs in the frequency domain and an Oscilloscope for measuring in the time domain. The Real Time Analyzer measures in the frequency domain by analyzing user-selectable 1/nth octave bins. The Spectrum analyzer offers high frequency resolution, and the real time analyzer offers nth octave resolution (like the human ear) and is less sensitive to fluctuations in rotation speed. Both instruments offer selectable averaging parameters to suit the application. The comparison of actual noise to pre-set limits or a reference unit is used to generate an output, ranging from a simple pass/fail signal, to a full failure mode analysis and report.
Customized test sequences are easy to develop using a simple point-and-click interface that enables complex tests to be built in a flow chart like format. Pre-programmed or user defined options are simply selected for each step in the test procedure, e.g. input voltage, recording trigger, recording time, type of analysis, output, data recording, etc.
Data is output in a variety of ways, ranging from a simple comparison to a reference unit with a PASS/FAIL indication for the production line operator, to customized reports or writing of complete test results to databases such as Microsoft® Access, SQL or Oracle® for parts traceability archiving, data-mining or report writing. NoiseCheck also features an extensive statistical analysis toolbox which can be used for Gage R&R studies including, max, min, mean, standard deviation, yield, Cpk, and Best Fit to Average.
- Quality Control on the Production line
- Incoming Inspection
- Quality Assurance
- Pre and post-service evaluation
- Sound Power Labeling
- Component testing
- Endurance test monitoring
- Gage R and R studies
- Product design
- Component and product level testing
Noise characteristics are an important part of the design of many products. NoiseCheck is an extremely flexible R&D test platform as its detailed results can be analyzed in many different ways and easily stored for further analyses.
NoiseCheck’s advanced algorithms allow fast and accurate testing even in noisy environments, and it is designed with automated production line integration in mind. NoiseCheck is compatible with automation software and communicates with hardware such as barcode systems and PLCs, using RS-232, IEEE-488, Bluetooth, FireWire, USB, and TTL interfaces. It can be integrated into larger test applications using National Instruments’ Test StandTM or Active X® environments, and controlled by other programs through LabVIEW or any programming language that supports ActiveX commands (VB.NET, C#, C++, Java etc. Test results can either be recorded in NoiseCheck or output to other software for full statistical process control. Within an automated environment, tests can be configured to start when the device under test is in place, and failed devices automatically removed from the production line.
NoiseCheck offers various levels of operator access to prevent accidental modification to test sequences and tests can be configured for one-click testing. This means that the operator simply chooses the product model and the test from a preprogrammed list ad hits “start”. NoiseCheck then executes the test, analyzes the data and compares the results to pre-defined pass/fail limits. Clear visual and/or and audible pass/fail signals are returned to the operator and data can be automatically exported for archiving. Various levels of operator control can be set to prevent modification to the test sequence.
Test sequences can be shared and emailed, making it easy to recreate the same test thoughout production facilities around the world. This saves time and offers increased repeatability of test procedures. With the software’s different language options and the use of the Internet to transfer data, the possibilities are endless.
Listen’s cost-effective range of hardware is fully integrated with the NoiseCheck software for a turnkey system that is easy to set up, calibrate and maintain. All hardware products are compact and rugged to withstand demanding environments, and most are rack-mountable.
USB Controlled integrated Hardware – AmpConnect ISC: AmpConnect ISC combines an audio interface, impedance box, amplifier, microphone power supply and digital I/O card in a single unit to simplify setup and minimize errors. This is the most cost-effective approach for most loudspeaker, headphone and microphone tests.
Audio Interfaces – AudioConnect and AudioConnect 4×4: AudioConnect is a professional audio interface offering 2 digital and 2 analog channels in and out, SCM microphone power, headphone amplifier and USB hub. AudioConnect 4×4 is a high precision audio interface offering 4 digital and 4 analog channels in and out, high signal to noise ratio, wide frequency response and a user-defined sampling rate up to 200kHz.
Audio Test Microphones – SCM-3: SCM-3 Measurement microphones are robust, accurate, stable, and offer excellent directional response in both near and far field. They are available in 2 lengths.
Microphone power supplies – SoundConnect and SoundConnect 2: SoundConnect is a single channel microphone power supply with an excellent signal to noise ratio. It powers one SCM/electret microphone and is also available with a 200V polarization option. SoundConnect 2 is a TEDS compatible dual channel microphone power supply with low self-noise and a wide frequency response. It powers 2 SCM/electret or IEPE microphones or accelerometers, and is available with a 200V polarization option.
Please fill out our demo request form to try NoiseCheck.