Webinars on Demand

The presentation explains the fundamental principle of sound level measurements. It furthermore introduces standard parameters and answers frequently asked questions regarding weighting, averaging, etc.

Useful Links from this Webinar

• Sound Level Meter

Covers the technical definition of sound pressure level, an explanation of how to sum sound levels from different sources, and more, together with practical examples.

Useful Links from this Webinar

• Sound Level Meter

The webinar introduces the basic principles of sound propagation, such as sound generation, near & far-field, reflections and absorption etc.

Useful Links from this Webinar

• Minirator MR-PRO
• Sound Level Meter

The presentation provides an introduction to the fundamental FFT calculation procedure, and explains the key parameters of this measurement method.

Useful Links from this Webinar

• Website with overview on FFT Fast Fourier Transform
• Website with additional information regarding FX100 audio analyzer
• Website with additional information regarding XL2 analyzer

The webinar covers advanced aspects of FFT analysis, such as window functions, aliasing, averaging, display modes or calculations with FFT data.

Useful Links from this Webinar

• Website with overview on FFT Fast Fourier Transform
• Website with additional information regarding FX100 audio analyzer
• Website with additional information regarding XL2 analyzer

The webinar covers basic aspects of Sweep analysis, including the types of sweeps, parameters used, and presents a practical sweep measurement.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer

The webinar covers the fundamental principle of GlideSweep, test parameters, the aspects of acoustic testing and more.

The webinar explains the key issues of audio signal generation, covers related issues such as Crest factor or level units, and provides practical examples.

Useful Links from this Webinar

• Minirator MR-PRO

Overview on how to verify an evacuation system with the XL2 Acoustic Analyzer.

Useful Links from this Webinar

• Download the STIPA reporting tool from the XL2 Support website
• Installed Sound & Evac Test Solution here.
• 24/7 Evacuation System Monitoring here

This webinar explains the measurement methods, workflow and result reporting for Speech Transmission Index for Public Address (STIPA) according to the latest standard IEC60268-16, edition 2011.

Useful Links from this Webinar

• Download the tools you need from the XL2 Support website
  - XL2 Projector Software
  - STIPA Reporting Tool


• Quick Guide: How To Commission an Installation


• Application Note: Speech Intelligibility STIPA

The webinar explains the basic test setup and strategy for 100V voice alarm systems. Furthermore, it covers the most common terms and parameters such as complex impedance, phase, power factor or the recommended test signal level and frequency.

NTi Audio offers three solutions for unattended noise monitoring with the XL2 Sound Level Meter,

• Managed mode
• Gateway mode
• Autonomous operation.

The webinar provides an overview on these three modes, explains the individual setup procedures and introduces the available options and accessories.

Useful Links from this Webinar

• More about Unattended Noise Monitoring
• More information about the XL2 Sound Level Meter
• More about the Data Explorer Software

The Rating Level Lr is used to assess the level of disturbance of industrial or environmental noise. Its evaluation begins with a measurement of the averaged sound pressure level LAeq. Penalties are applied for tonal and impulsive characteristics dependent on the time of the day.

The webinar explains how to objectively identify the relevant impulses and tones using both survey grade and engineering grade methods including FFT tonal assessment by the reference method, and how to calculate the applicable penalties.

Useful Links from this Webinar

• More information about the XL2 Sound Level Meter here.

Explanation of the most frequently used sound level measurements, e.g. instantaneous level, equivalent level, maximum and peak level, percentiles etc.

Useful Links from this Webinar

• More information about the XL2 Sound Level Meter here.

Overview and explanation of the available software solutions for the analysis and documentation of long-term sound level measurements with the XL2.

Useful Links from this Webinar

• Download the reporting tools you need from the XL2 Support website
  - XL2 Data Explorer PC-Software (Advanced reporting)
  - Sound Level Meter (Live events, DIN15905, SLV, Vlaams Geluidsrapport)
  - Noise Exposure
  - STIPA


• More information about the XL2 Sound Level Meter here.

The webinar presents typical applications and best practices of noise analysis with the Data Explorer software.

Useful Links from this Webinar

• XL2 Audio and Acoustic Analyzer
• Data Explorer Software
• Noise Measurement Solutions

Backgrounds and practical application hints on Noise Curve measurements with the XL2 Acoustic Analyzer.

Useful Links from this Webinar

• Read about the XL2 instrument you need to measure Noise Curves here.

Step-by-step explanation of the settings essential to prepare and log a long-term sound level measurement. Includes hints on the practical use of the XL2 and hints on available post-processing tools.

Useful Links from this Webinar

• More information about the XL2 Sound Level Meter here.

An often-recurring challenge in the analysis of long-term sound level measurements is the integration of various data sets into a single final report. For instance, several 24-hour recordings may have to be concatenated into one project, or the overall Rating Level be calculated based on a group of results.

This webinar therefore explains the process of combining sound level measurements, explains the difference between the Day/Night vs. the Rating Level, and proposes a practicable procedure to create a single professional report from the project data.

Useful Links from this Webinar

• Read more about Unattended Noise Monitoring here.

Overview on professional sound level measurements in an industrial environment. Includes an explanation of basic measuring parameters and preparations, as well as practical application hints.

Useful Links from this Webinar

• More information about the XL2 Sound Level Meter here.

Technical basics of sound level measurements, legal restrictions, as well as preparations and execution of live event monitoring including reporting tools.

Useful Links from this Webinar

• Read about the instruments you need to comply with sound limits here.


• Download the reporting tools from the XL2 Support website
  - XL2 Projector Software
  - Sound Level Predictor
  - Reporting Tools
  - Profiles


• Quick Guides
  - How To Comply With Regulations
  - How To Setup For A Live Event

When setting up a sound system, you frequently encounter problems such as no signal, hum or bad sound quality. The XL2 Audio Analyzer, together with the MR-PRO Signal Generator represent the perfect combination of handy tools that assist you to cope with these challenges.

The webinar covers the most common issues that may result in sound system flaws, be it for live sound or a permanent installation. We will explain efficient and quick approaches to identify and overcome such issues in practice.

Useful Links from this Webinar

• XL2 Acoustic Analyzer
• Minirator MR-PRO / MR2
• Read more about Live Sound Test Solutions
• Read more about Test Solutions for Electroacoustic Installations

Introduction to RT60 reverberation time measurements with the XL2.

Useful Links from this Webinar

• Read about the instruments you need to measure RT60 here.
• Room Acoustics Reporter Software
• More information about the XL2 Acoustic Analyzer here.

The webinar introduces the standard procedures for measuring the airborne and impact sound insulation, and provides additional information about the required equipment and the related terms and standards.

Useful Links from this Webinar

• Read more about Room & Building Acoustics.
• Sound Insulation Reporter Software
• More information about the XL2 Acoustic Analyzer here.

Sound insulation measurements require a high level of experience and application know-how. The webinar therefore focuses on practical aspects such as the correct positioning of the sound source and the microphone, the optimum workflow and other frequently asked questions.

Useful Links from this Webinar

• Read more about Room & Building Acoustics.
• Sound Insulation Reporter Software
• More information about the XL2 Acoustic Analyzer here.
• Read more about NTi Audio Noise Sources.

The acoustic performance directly affects the speech intelligibility within a classroom, which in turn has a big impact on the learning success of the students.

The webinar therefore explains how to evaluate the acoustic performance, introduces typical target specifications, and introduces potential measures to improve a deficient classroom.

In recent years, a growing number of audio devices such as smartphones, headsets, TV sets, loudspeakers etc. allow communication via a Bluetooth interface. Consequently, there is a rising demand for manufacturers of these devices to reliably verify the quality of this communication during the production process. This webinar covers the fundamentals of Bluetooth audio performance testing, explains the challenges, and proposes practical solutions.

Useful Link from this Webinar

• More about the NTi Audio Bluetooth Box
• More about the FLEXUS FX100 Audio Analyzer
• NTi Audio Bluetooth Box Data Sheet

The presentation explains the relevant terms and standards related to the calibration of test instruments, such as adjustment, calibration, traceability or conformance. Furthermore, it describes the typical procedure of a device calibration, including RMA-handling, calibration execution and certification.

Testing the quality of loudspeakers or microphones built into smart devices can be tricky, simply because there are no input or output connectors provided. The webinar presents a practical solution to this challenge, by introducing the concept of 'open loop' testing. This approach allows quick measurement of the most relevant acoustic parameters such as frequency response, sensitivity or audible distortions in an industrial environment.

Useful Link from this Webinar

• Testing Smart Devices

This webinar highlights the challenge of evaluating the Audio quality of the output of devices that have no connected input. The test signal first has to be stored on the Device Under Test (DUT) and then replayed by the DUT during the test measurement. Further, the Audio analyzer must trigger from and synchronize correctly to this incoming asynchronous signal.

Useful Link from this Webinar

• Testing Smart Devices

It is increasing common to find microphones being used in communication devices, consumer electronics, cars and household appliances; especially digital MEMS microphones. Typically, these are arranged as an array of multiple microphones. Thus the localization of a person speaking (Beamforming/Noise Cancellation) can be achieved.

From the point of view of the production test engineer this poses various challenges; the generation of a homogeneous sound field, the parallel processing of several channels, and the interpretation of the data obtained. This webinar therefore explains the basic operation of digital MEMS microphones and demonstrates strategies and approaches to testing them.

Useful Links from this Webinar

• Read more about the Quality Control of digital MEMS Microphone Arrays.
• More information about the FLEXUS FX100 Audio Analyzer.

Introduction of the required equipment and steps that are executed for testing a D-class amplifier with the FX100 audio analyzer.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer
• Accessories for the FX100 audio analyzer

Explanation on how to adjust / measure the output power / power consumption of a device with the FX100 Audio Analyzer.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer
• Accessories for the FX100 audio analyzer

The webinar proposes a step-by-step procedure to establish a reliable and relevant audio test for simple audio devices. It focuses on the required steps to set meaningful tolerance limits, even in cases where no test specifications are available.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer

Presentation of a typical setup procedure for loudspeaker quality control with the FX100 audio analyzer.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer
• Solutions website regarding speaker, driver and cabinet testing with the FX100 audio analyzer

Introducing the alternatives to connect external devices such as a foot switch, stack light, barcode scanner etc. to the FX100 audio analyzer in the typical test configurations.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer
• Accessories for the FX100 audio analyzer

Presenting typical test setups and procedures for measuring and verifying the performance of microphones with the FX100 audio analyzer.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer
• Microphone testing with the FX100 audio analyzer

The webinar forms part of the Virtual ALTI-Expo 2020.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer
• Microphone testing with the FX100 audio analyzer

Introduction to the design of consecutive FX100 test procedures by using the sequencer tool of the FX-Control software.

Useful Links from this Webinar

• Website with additional information regarding FX100 audio analyzer

The webinar explains the fundamental vibration level measurements and units for Pass/Fail test applications. Furthermore, it shows the operation of the XL2 Vibration Meter and sensors in practice.