What is a Class 1 Sound Level Meter?

Articles, Environmental Noise, Information, Noise Measurement, Questions, Sound Level Meters No Responses »
Oct 272011

A Class 1 Sound Level Meter is a noise measurement instrument that meets the requirements of IEC 61672-1:2002 (or an equivalent such as BS EN 61672-1:2003) to Class 1 performance.

Tolerances & Accuracy

This standard specifies two levels of performance, Class 1 and Class 2, with Class 1 being effectively more accurate. Within the standard are a set of performance criteria that an instrument must meet and each of these has a tolerance associated with it. The tolerances for Class 1 are tighter than for Class 2. For example, at the reference frequency of 1kHz, the tolerance limits for Class 1 are +/- 1.9dB and for Class 2 the tolerance is +/- 2.2dB. Continue reading »

Posted by James Tingay at 5:17 pm Tagged with: , , , ,

What is the difference between Class and Type for Sound Level Meters?

Articles, FAQ, Noise Measurement, Questions, Sound Level Meters No Responses »
Sep 262011

The sound level meters and noise dosemeters that Cirrus manufactures are designed to meet the performance criteria laid down in various standards.

For example, the optimus sound level meters are designed to meet the requirements of BS EN 61672-1:2003 which is also known as IEC 61672-1:2002.

Within these standards there are many different performance criteria that the instrument must meet along with tolerances that are allowed. It may not be possible for the instrument to meet the exact requirements all of these criteria but as long as it is within the tolerances that is acceptable. Continue reading »

Posted by James Tingay at 4:49 pm Tagged with: , , , , , , ,

Why don't Noise Dosemeters have a Class or Type designation?

Information, Noise at Work, Questions, The doseBadge 1 Response »
Aug 262011

All of the noise measurement instruments that you use should comply with one or more standards which specify the accuracy that the unit should have.

There are many different standards for noise measurement instruments such as sound level meters, noise dosemeters and acoustic calibrators and these will each have their own specific requirements, tolerances and performance criteria. Continue reading »

Posted by James Tingay at 4:27 pm Tagged with: , , , , ,

What Class or Type of Sound Level Meter is needed for Noise at Work (UK)?

FAQ, Information, Noise at Work, Questions No Responses »
Aug 012011

The Control of  Noise at Work Regulations 2005 require, that when you are measuring noise exposures, that you use a sound level meter or noise dosimeter that meets certain standards.

This is to ensure that the measurements are as accurate and repeatable as possible. This helps to reduce the uncertainties and potential sources of errors as much as possible. Continue reading »

Posted by James Tingay at 4:17 pm Tagged with: , , , , , ,

Cirrus achieves ISO 14001:2004 Registration

Information, New Products, News & Press Releases, Product News No Responses »
Sep 222010

Cirrus Research plc, the world leader in noise measurement instruments, has achieved recognition of its Environmental Management System to ISO 14001:2004.

This new registration adds to the existing ISO 9001:2008 for the Quality Management System.

Find out more by clicking here.

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