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Latest Noise News

5 Biggest Noise At Work Mistakes

5 Biggest Noise At Work Mistakes

You’ve been told you have to complete a Noise At Work Risk Assessment. There’s all the Regulations for you to read through. A plethora of potential instruments to choose from. Endless choices to make. And all that’s before you even start measuring noise. How do you do it, avoid all the common mistakes and comply with the Regulations? What if I told you there was an easier way to find out exactly what you need?

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Karaoke microphone

Why Why Why – No Delilah?

Christmas might be a bit quieter this year for some Lancashire residents after noisy neighbours were stripped of their karaoke machine by Noise Nuisance officers.

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Fireworks over Tower Bridge

How to Protect Your Hearing this Bonfire Night

Yes, The 5th November is almost here. The brilliant bonfires and fantastic fireworks will soon be bursting into life, painting the skies with their cocktails of colours. So, don’t commit treason and protect your hearing. Not sure how? Here’s our advice.

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Recommended By Our Noise Experts

Optimus Red Class 2 Sound Level Meter for Noise at Work

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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Man holding an optimus sound level meter

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-Approval-optimus-CR171C-1x300x186

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 the 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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