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Latest Noise News

what are the 4 different types of noise

What are the 4 Different Types of Noise?

Noise comes in all shapes, sizes and sounds. It’s part of our everyday lives but before you can accurately measure it, you need to know what the different types of noise are. Here’s my advice.

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Dry January, Alcohol and Hearing Loss

You ate and drank too much over Christmas, so you start 2015 with a health kick. You’re back at the gym, you’ve cut down on the carbs and you’re sticking to your 5-a-Day but did you know giving up the alcohol could also help your hearing?

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New Year Off - Save up to 30% when you trade in old intruments

New Year’s Resolution: Save up to 30%

It’s 2015! After enjoying the excesses of Christmas, we are all looking for new ways to save money. How about saving 30% on your noise measurement equipment?

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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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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 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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