NTi Audio - Model XL3 -Professional Sound Level Meter and Acoustic Analyzer

The large 4.3" IPS color touch display offers an excellent resolution of 480 x 800 pixels. This allows the intuitive control of all measurement functions in multiple languages and presents noise level readings in large, clear digits. Select between a traditional white, blue or black background theme – just as you might do on your smartphone. An additional haptic keypad with eight buttons controls the common instrument functions, such as power on/off for the XL3 and start/stop for the measurement.

The XL3 includes an integrated web server and file server accessible through the instrument`s built-in Wi-Fi or LAN connectivity. Just use your preferred web browser and connect to the sound level meter through the NTi Connect service. The instrument can be controlled by an authorized user from anywhere in the world. Alternatively, you can connect directly to the device`s IP Address through your local network – e.g., in building acoustics, the impact sound level measurement can be started directly from the sending room.

All measurement data can be easily downloaded without interruption to an ongoing measurement. To log prevailing weather conditions, a weather station can be added. Additionally, the online XL3 synchronizes to the actual time automatically using the ntp protocol. This and the optional APIs for controlling the instrument to retrieve historical and current noise, audio and weather data simplifies the integration into monitoring systems.

The XL3 forms a class 1 sound level meter in combination with the measurement microphones M2230 or M2340. All sound pressure levels are measured precisely at the same time and presented in large digits on the color display. Readings exceeding the preset limit turn red indicating non-compliance, while the data is logged in 1 second intervals and the audio is recorded simultaneously. The XL3 is the perfect tool for an easy investigation of noise complaints and long-term noise monitoring. 

Additionally, the noise spectrum is measured in both octave or one-third-octave resolution, e.g. for tonality investigations, as well as the optional event-marker, back-erase and pre-trigger - all of which extend the sound level meter capabilities for effective attended environmental noise surveys.

At the same time, the XL3 Sound Level Meter is optimized for unattended noise monitoring. The instrument automatically continues the measurement as soon as power resumes in case of an accidental power failure. The long battery life time and the versatile connectivity options allow online control from your preferred web browser from anywhere around the globe including audio streaming for live listening. A weather station may be connected directly to the XL3 and external devices controlled via the accessory I/O-PCB. 

All stored measurement data is available in simple text format. Detailed data evaluation and rating level calculations are carried out in the optional Data Explorer PC Software.

Features

The XL3 determines the frequency spectrum with a Class 1 filter bank in octave or one-third octave resolution between 6.3 Hz and 20 kHz. The minimum, maximum and average sound pressure levels of all frequency bands are measured in parallel. The frequency axis can be freely zoomed and scrolled to e.g. 125 Hz – 8 kHz for appliance noise investigations. The summed level of the selected frequency range is shown in the spectrum view at the same time.

Features

• Class 1 according to IEC 61260 and ANSI S1.11 with filter base 10
• Octave band: 8 Hz - 16 kHz, one-third-octave band: 6.3 Hz - 20 kHz
• Leq, Lmax, Lmin with frequency weighting A, C, Z
• Time weighting: Fast, slow
• Percentile statistics for Lxy (x= A, C or Z, y= F or S): 1 – 99% (optional)

The XL3 measures the reverberation time in octave bands from 63 Hz – 8 kHz using the standardized T20 or T30. The room may be excited using an impulse source or an interrupted pink noise. The Acoustic Analyzer averages all the recorded decays for each measurement position automatically. Additionally, installing the Extended Room Acoustics Option enables reverberation time measurement in one-third octave resolution, visualizing the decay curve, calculating the spatial average of the room and simultaneous T30/T20/T15/EDT measurement on the XL3 Acoustic Analyzer. Additional quality indicators, such as linearity and curvature, describe the decay curve in accordance with the standard ISO 3382-2. An audio file of the level decay may be recorded for more detailed analysis.

Features

• ISO 3382 and ASTM E2235 based on Schroeder backward integration
• Octave band: 63 Hz - 8 kHz
• Measurement parameters T20, T30
• Impulse and interrupted noise source
• Automatic averaging for each position
• 1/3 octave band: 50 Hz - 10 kHz (optional)
• T20, T30, T15, EDT simultaneously (optional)
• Calculating spatial room average (optional)
• Audio recording (optional)
• Minimum trigger level (optional)
• Decay curve (optional, planned)

The XL3 Acoustic Analyzer enables direct determination of airborne, impact and facade sound insulation on the instrument. Simply measure in the sending and receiving room and see the sound insulation values displayed for immediate compliance confirmation on-site. For additional partitions with the same source or receiving rooms, the XL3 offers time-saving features by re-using of measurement data from previous measurements e.g. reverberation time data or background noise measurements for a common receiving room. In order to prevent any sound absorption from your body, you can leave the room and control the instrument from your mobile phone using Wi-Fi or the 4G/5G network. Generating the final measurement report for sign-off is easy utilizing the optional Sound Insulation Reporter PC Software.

Features

• Airborne and impact sound insulation on XL3
• Standards ISO 16283 and ISO 717
• Automated measurement data averaging
• Re-use of existing data
• Results D, D’n, D’nT and R`
• Chart and table

Extended Noise Measurement Option
The Extended Noise Measurement Option adds the advanced features below for more challenging tasks of noise consultants.

• Sound exposure level LAE
• Time weighting: Impulse
• Level difference LAIeq – LAeq
• Percentile statistics L% (broadband & spectrum)
• Logging 100 ms (broadband & spectrum)
• Audio recording: 24, 32 bit with 12, 24, 48, 96 kHz
• Level Time History
• Event-triggered audio and data recording (planned)
   

NTi Audio #: 

• Extended Noise Measurement: 600 000 707
• Extended Noise Measurement 365: 600 000 721
  (annual subscription service)

The Sound Insulation Option extends the XL3 for building acoustic applications. The instrument measures the sound pressure level in the sending and receiving room and the reverberation time. All data is aggregated in accordance with the standard and the sound insulation results prompted on the display on-site. This forms the XL3 into a Building Acoustics Analyzer designed for professionals.

Room acousticians value the following optional features for extended reverberation time measurements.

The XL3 Acoustic Analyzer offers an integrated web server for easy access through the internet using https://connect.nti-audio.com. You can remotely control your instrument and download all measurement and audio files simply from a web page. Alternatively, data can be accessed through sftp using an external application such as WatchFTP.

This NTi Connect service is free up to a monthly data volume of 2 GB. Data download speed for access above 2 GB is slowed down. The NTi Connect Open Data subscription retains the communication at full speed, e.g. for the downloading longer audio recordings.

• Easy and secure access to webpage and data files
• Remote API from all around the globe
• No static / public IP / VPN or port forwarding required

Data Explorer is a PC-based software application with a powerful data processor for easy and fast analysis of sound level measurement data recorded by the XL2 or XL3. Visualize, analyze and control millions of data points with this tool that is dedicated to acoustic consultants and noise measurement professionals. It provides a convenient way to view and manage your data and quickly create customized reports.

The import of logged noise level data into the Data Explorer software is enabled by an activated license for the individual instrument.

NTi Audio #:

• XL3 Data Explorer Permanent: 600 000 717
• XL3 Data Explorer 365: 600 000 730 (annual subscription service)
   
• XL2 Data Explorer Permanent: 600 000 430
• XL2 Data Explorer 365: 600 000 431 (annual subscription service)

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Sound Insulation Reporter is a PC-based software application that provides all the standard reports for Airborne, Impact and Facade sound insulation measurements. Designed for acoustic consultants, this comprehensive tool uses data gathered by the XL2 or XL3 Acoustic Analyzer, and quickly returns graphical analysis for all measurement positions.

The import of measurement data into the Sound Insulation Reporter software is enabled by an activated license for the individual instrument.

NTi Audio #:

• XL3 Sound Insulation Reporter Permanent: 600 000 718
• XL3 Sound Insulation Reporter 365: 600 000 731 (annual subscription service)
   
• XL2 Sound Insulation Reporter Permanent: 600 000 432
• XL2 Sound Insulation Reporter 365: 600 000 433 (annual subscription service)

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The Room Acoustics Reporter is a PC software for automatically generating reverberation time measurement reports and analyzing the noise spectrum. The software supports acousticians and experts in the visualization and detailed evaluation of measurement data recorded with the XL2 or XL3 Sound Level Meter.

The import of measurement data into the Room Acoustics Reporter software is enabled by an activated license for the individual instrument.

NTi Audio #:

• XL3 Room Acoustics Reporter Permanent: 600 000 719
• XL3 Room Acoustics Reporter 365: 600 000 732
  (annual subscription service)
   
• XL2 Room Acoustics Reporter Permanent: 600 000 440
• XL2 Room Acoustics Reporter 365: 600 000 441
  (annual subscription service)

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Room Acoustics

Building Acoustics