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Latest Noise News

5 Reasons to Choose Cirrus Research

5 Reasons to Choose Cirrus Research

You need noise measuring equipment. You’ve requested quotations from various manufacturers but how do you compare them? Here’s 5 reasons why you should buy your noise measurement equipment from Cirrus Research.

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data logging sound level meter

What is a Data Logging Sound Level Meter?

Looking to buy a sound level meter? You’ll probably see the term “data logging sound level meter” quite frequently. But what exactly is a data logging sound level meter and what does it mean for your noise measurements?

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national railway museum case study

doseBadge Builds up a Head of Steam in York

Here’s the latest case study from Cirrus Research, featuring the world-famous National Railway Museum. See how the doseBadge Noise Dosimeter helps Anna Kavanagh check that her teams are not exceeding their daily noise exposure limits.

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Recommended By Our Noise Experts

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What are Octave and Third Octave Band Filters on a Sound Level Meter?

When more detailed information about a complex sound is needed, the frequency range of 20Hz to 20kHz can be split into sections or bands. This is done electronically within a sound level meter.

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a sound level meter to IEC 61672 standard

What’s the Difference Between a Class 1 and Class 2 Sound Level Meter?

We’ve covered the differences between Class and Type in sound level meter standards in a previous post but what the differences between a Class 1 and Class 2 sound level meter?

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What are A, C & Z Frequency Weightings?


On your sound level meter or noise meter you will often see references to Frequency Weightings such as ‘A’, ‘C’ or ‘Z’.

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Cirrus Product Updates

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NoiseTools is now compatible with Windows 8.

A new version of the NoiseTools software is available that is compatible with the new Windows 8 operating system.
Version 1.4.4 of NoiseTools can be downloaded from the Cirrus website or updated from within NoiseTools itself.

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PTB Type Approval for the optimus sound level meters

We are delighted to announce that the optimus red and optimus green sound level meters have been Type Approved by the PTB in Germany!

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Tonal Noise Analysis with Optimus Green Sound Level Meters

Often the sound energy from a noise source will be spread over a wide band of frequencies. Sometimes a noise source will emit noise that is concentrated in a narrow part of the spectrum or contains a high proportion of energy at a single frequency (a “pure tone”).  This is referred to as tonal noise.

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