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Noise Frequency Real Time Analyser

Noise Frequency Real Time Analyser
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Noise Frequency Real Time Analyser

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Noise Frequency Real-Time Analyser with 1/1 & 1/3 Octave Band Filters simultaneously measures all parameters with all Frequency and Time Weightings, giving you the confidence you will always have the correct data for analysis. This high-performance meter offers exceptional acoustic performance but it is still easy to use; taking measurements is as simple as pressing the 'record' and 'stop' buttons. Available as a Class 1 (Model 33-1) or a Class 2 (Model 33-2) meter.

The Real-Time Analyser allows you to measure all Octave Bands at the same time, immediately capturing all of the data in each band and not missing any important information. This is very practical for reliable, accurate, and rapid capture of variable noise levels to optimize environmental monitoring surveys or provide an accurate prescription of hearing protection in industrial environments. 

For environmental noise monitoring under BS 4142:2014, the large memory, programmable auto-repeat function, and statistical LN values, combined with the optional addition of an outdoor kit, ensures the instrument is ideal for use as either a short-term or longer-term semi-permanent environmental monitor. The ability to take measurements every 125ms allows the user to conduct detailed analysis for engineering and environmental noise. It is also available with remote management so you can see the real-time noise Frequency measurements at your computer whilst taking measurements elsewhere.

The wide dynamic span of over 110dB in the single measurement range ensures you never make invalid measurements that ‘Overload’ or ‘Under range’ which is especially important during 1:1 or 1:3 Octave Band Analysis. An extensions module is available to enhance both the low and high-frequency limits of the 1:3 Octave Band Filters so that frequencies as low as 6.5Hz up to 20kHz can be measured. 

The two outstanding powerful software packages, Analyser and Acoustic Toolbox software allow you to download, analyze in-depth and present your results in a variety of formats.


Features include:

  • Powerful measurement of Noise Frequency in real-time
  • Compliant to the latest Noise Regulations IEC 61672-1 (Class 1), 61672-2 (Class 2), and BS 4141:2014
  • 1:1 and 1:3 Octave Band Filters
  • High acoustic performance
  • Large memory for data storage
  • Measurements every 125ms allowing detailed analysis
  • Available as Class 1 (Model 33) and Class 2 (Model 33-2)


With exceptional acoustic performance and compliance to the latest worldwide guidelines the Model 33 is perfect for the following applications:

  • Environmental noise monitoring
  • Tonal analysis of Environmental noise using 1:3 Octave Band Analysis
  • Industrial noise measurements
  • Accurate prescription of hearing protection using Real-Time Octave Band Analysis
  • Building acoustic measurements (using the optional frequency analyzer reverberation time module)
  • Vehicle noise testing using remote measurement abilities
  • Ideal for engineering applications such as noise control & reduction using 3D tonal analysis and reverberation measurements.
  • Longer-term outdoor noise measurements with optional weatherproof kits
  • Noise measurements down to Real-Time NC curve calculations.
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