Tutorial-Videos

Tutorial Videos helfen Ihnen bei der Vorbereitung und/oder Durchführung von Messungen (auch bei Youtube verfügbar).

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Acquisition sequence: Full tutorial

NVGate General

How the acquisition sequence can be used to automatically update a set of settings such as Label, Node, Direction…?

This is very useful for modal acquisition for example.

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Acquisition sequence: Introduction

NVGate General

How the NVGate sequencer can be used to update settings such as degree of freedom for modal purpose.

 

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Acquisition sequence: Step 01

NVGate General

Create a sequence

This video shows how to create a sequence from a scratch to update measurement settings.

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Acquisition sequence: Step 02

NVGate General

Import a sequence

This video shows how to import an Excel sequence into NVGate.

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Acquisition sequence: Step 03

NVGate General

Measurement with a sequence

Once measurement is completed, the active sequence will update a set of settings such as Label, Node, Direction… Measurements are also labeled from sequence, as shown in this video.

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Acquisition sequence: Tip

NVGate General

Automatic measurement with a sequence

How to get a fully automated sequence of measurements.

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Basic operation

Sound Quality Plus Sound Quality

How to analyze an imported sound and how to export results?

It compares the resolution of FFT spectrogram and auditory spectrogram, and shows how to use harmonic cursor.

 

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Force and response windowing: Full tutorial

NVGate

How to build a setup using the force and response window?

 

In most cases uniform windowing is preferred but sometimes force/response windowing is required.

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Force and response windowing: Introduction

NVGate FFT

This video explains the advantages of using force and response windowing for impact test.

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Force and response windowing: Step 01

NVGate FFT

FFT settings

In most cases uniform windowing is preferred but sometimes force/response windowing is required. This video shows how to change the type of windowing used in the FFT plug-in.

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Force and response windowing: Step 02

NVGate FFT

Add layout

Before setting up the response and force windowing, one has to overlay the raw time block and the weighted time block, as shown in this video.

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Force and response windowing: Step 03

NVGate FFT

Set the response window

The real time view allows to visualize how the windowing affects the FFT processing and to adjust the settings for a better damping estimation, as shown in this video.

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Force and response windowing: Step 04

NVGate FFT

Set the force window

The real time view allows to visualize how the windowing affects the FFT processing and to adjust the settings for a better damping estimation, as shown in this video.

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How to concatenate two arrays

Holography Underwater Holography

How to automatically concatenate two partial circular arrays via merging two projects.

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Impact hammer: Full tutorial

NVGate FFT

How to build a setup for impact test measurement and create an automatic report.

 

Find also some tips to make your measurement easier. The FFT plug-in is used. The measurement is triggered on the hammer impact using an edge detection event.

 

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Impact hammer: Introduction

NVGate FFT

This video shows the important results that guarantee a good impact hammer metrology.

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Impact hammer: Step 01

NVGate FFT

Select inputs

How to setup the input table with hammer and accelerometers and how to enter degrees of freedom, set up the sampling frequency

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Impact hammer: Step 02

NVGate FFT

Display and save results

How to display and save the key results (coherence, FRF, autospectrum and triggered block) to monitor the quality of impact tests in real time.

 

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Impact hammer: Step 03

NVGate FFT

Set the trigger

How to trigger a FFT analysis on an impact hammer using an edge detection event.

 

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Impact hammer: Step 04

NVGate FFT

FFT settings

How to set the FFT plug-in to properly compute FRF, coherence and others. It is also shown ergonomic features such as accept mode.

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Impact hammer: Step 05

NVGate FFT

Check the saved results

Basic results for modal purpose are FRF and coherence. This video shows how to check that the results will be properly saved before starting numerous measurements.

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Impact hammer: Step 06

NVGate FFT

Update the DOF

Before each new impact location, node and direction (DOF) have to be updated. This video shows how to manually setup DOF easily.

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Impact hammer: Tip 01

NVGate FFT

Display the current block

When time blocks are long because of high resolution requirement, it is convenient to know if the impact has trigged the FFT analysis thanks to a progress bar.

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Impact hammer: Tip 02

NVGate FFT

Set the threshold

During a structure probing, surface stiffness can change (stiffer and softer). Therefore, it is necessary to adjust the impact threshold for triggering FFT.

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Impact hammer: Tip 03

NVGate FFT

Perform an autorange

During a structure probing, force or response can considerably change. Autorange allows to adjust the range peak automatically to optimize amplitude resolution.

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Record signals: Full tutorial

NVGate Recorder

How to perform a signal recording in 5 steps.

In this example, the recorder mode is "start to stop": the user starts and stops manually the recording. Other modes are available (Start to time, time to stop).

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Record signals: Introduction

NVGate Recorder

This video explains the advantages to record signals for further analysis.

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Record signals: Step 01

NVGate Recorder

Select inputs

How to select the transducers used. In this example, we connect 3 microphones.

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Record signals: Step 02

NVGate Recorder

Sampling frequency

How to adjust the sampling frequency to 51.2 kHz in order to have a bandwidth of 20 kHz.

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Record signals: Step 03

NVGate Recorder

Activate the recorder

How to activate the signal recording.

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Record signals: Step 04

NVGate Recorder

Display signals

This video shows how to display the signals during the acquisition.

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Record signals: Step 05

NVGate Recorder

Recording

How to start and stop a recording. The recorder mode is "start to stop". Other modes are available (Start to time, time to stop).

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Rotating analysis with FFT: Full tutorial

NVGate FFT

How to build a setup for online rotating analysis using the FFT plug-in

and how to post-analyse the recorded signal and perform an order extraction from the time-frequency waterfall.

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Rotating analysis with FFT: Introduction

NVGate FFT

How the order tracking can help to make a diagnosis on a rotating machine.

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Rotating analysis with FFT: Step 01

NVGate FFT

Select inputs

Basic steps to guarantee a proper acquisition of signals coming from accelerometer or microphone for instance.

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Rotating analysis with FFT: Step 02

NVGate FFT

Set a tachometer

The simplest way to set up a tachometer input in NVGate.

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Rotating analysis with FFT: Step 03

NVGate FFT

Display results

How to display and save the relevant results such as signal time history, overall acoustic level, g’s spectrum, tachometer instant value.

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Rotating analysis with FFT: Step 04

NVGate FFT

Analysis settings

How to set FFT and OCT module for typical rotating machine analysis during transient shaft speed.

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Rotating analysis with FFT: Step 05

NVGate FFT

Post-analysis setup

How to analyze recorded signal in post-analysis mode.

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Rotating analysis with FFT: Step 06

NVGate FFT

Order extraction

How to extract orders from FFT time-frequency waterfall.

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Rotating analysis with FFT: Tip

NVGate FFT

Create a Delta RPM event

How to create a delta RPM event to reduce the amount of spectra for a long term machine run-up.

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RPM depending analysis

Sound Quality Sound Quality Plus

How to do RPM depending display with order cursor. It shows how to generate and post processing tacho signal from FFT spectrogram.

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RT60 with interrupted source: Full tutorial

NVGate Octave

How to build a setup for RT60 measurement using the interrupted source method.

The analyzer output is used to generate a white noise. Thanks to a macro, the whole measurement is automated. It shows how to compute T20 or T30 from the decay curves.

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RT60 with interrupted source: Introduction

NVGate Octave

Different indicators (like T20 and T30) can be computed to determine the reverberation time RT60.

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RT60 with interrupted source: Step 01

NVGate Octave

Select inputs

How to setup the input table with 2 microphones. In this example the 2 microphone are located inside a meeting room.

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RT60 with interrupted source: Step 02

NVGate Octave

Display results

How to display the waterfalls of average 1/n octave spectra on 2 different layouts and how to add them to the saved results selection.

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RT60 with interrupted source: Step 03

NVGate Octave

OCT settings

How to adjust the OCT Plug-in settings to compute 1/3 octave spectra with exponential averaging and a time constant of 20 ms.

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RT60 with interrupted source: Step 04

NVGate Octave

Waterfall settings

The waterfall will collect a spectrum every 5 ms (depending on the sampling frequency). This video shows how to adjust the waterfall depth to collect 1000 spectra.

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RT60 with interrupted source: Step 05

NVGate Octave

Output settings

How to configure the analyzer's output to generate a white noise. The transition time is reduced and the output is muted.

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RT60 with interrupted source: Step 06

NVGate Octave

Customize Control Panel

How to create shortcuts in the control panel to easily change some settings if needed.

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RT60 with interrupted source: Step 07

NVGate Octave

Assign a macro

How to choose a hotkey (F2) to start the macro "RT60_interrupted_source", which will generate the noise, start and stop the measurement.

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RT60 with interrupted source: Step 08

NVGate Octave

Measurement

How the macro is launched using the hotkey. The macro generates the noise, starts the measurement, stops the noise and then stops the measurement.

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RT60 with interrupted source: Step 09

NVGate Octave

Export results

How to export the results in .txt format using the "generate one file per result" option.

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RT60 with interrupted source: Step 10

NVGate Octave

Import results into Excel

How to import the results for each microphone (position) in the Excel computation file for RT60 with interrupted source.

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RT60 with interrupted source: Step 11

NVGate Octave

Axis settings

In the Excel sheet, we identify the time and the amplitude range of interest for the decay curves. The video shows how to adjust all the axis from the Settings tab.

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RT60 with interrupted source: Step 12

NVGate Octave

Calculation mode

The calculation mode (T20, T30 or manual) can be changed for all bands or some bands to get the best fit of the regression lines.

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RT60 with interrupted source: Step 13

NVGate Octave

Report

The RT60 values for each 1/3 octave band and the calculation mode used (T20/T30/m = manual) are displayed in the Report tab, as shown in the video.

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Sound design based on auditory spectrogram

Sound Quality Sound Quality Plus

How to design sound via innovative editing and resynthesis of auditory representations.

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Sound filtering

Sound Quality Lite Sound Quality

How to filter sound by a cascade of frequency-based and order-based filters.

It shows how to batch processing multiple signals and how to compare similar sounds by using the distance spectrogram and playback list.

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Sound insulation: Full tutorial

NVGate Octave

How to build a setup for sound insulation measurement and the obtained results in 6 steps.

The OCT plug-in is used. Operators enable to compute the average inside level (microphones 1 and 2) and the level difference between the inside and outside level.

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Sound insulation: Introduction

NVGate Octave

This video explains the measurement setup for sound insulation measurement.

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Sound insulation: Step 01

NVGate Octave

Select inputs

How to setup 2 microphones to measure the level inside the room and 1 microphone to measure the level outside the room.

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Sound insulation: Step 02

NVGate Octave

Sampling frequency

How to adjust the sampling frequency to 51.2 kHz in order to have a bandwidth of 20 kHz.

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Sound insulation: Step 03

NVGate Octave

Display results

How to display the average 1/n octave spectra and the overall levels for all microphones.

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Sound insulation: Step 04

NVGate Octave

OCT settings

How to adjust the OCT Plug-in settings to compute octave spectra from 16 Hz to 8 kHz with linear averaging on 10 seconds.

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Sound insulation: Step 05

NVGate Octave

Create operators

How to create a quadratic average operator and a dB comparison operator to compute the averaged inside level and the level difference between inside and outside the room.

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Sound insulation: Step 06

NVGate Octave

Measurement and results

Average spectra, overall levels and operators are displayed. In the infotrace, it is possible to display the values for specific octave bands using the cursors as shown in this video.

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SoundSpot office demonstration

Beamforming

How to post-analyze data measured by SoundSpot to generate acoustic maps and acoustic videos for source localization?

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Underwater holography demonstration

Holography Underwater Holography

How to localize noise sources with acoustic maps

how to quantify and rank sources with sound power, and how to predict noise radiation in the far-field, based on the sound pressure measured by an array close to the test object.

 

You may also read Underwater sound source localization using Near-field Acoustic Holography (NAH) application note.

 

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