Type Approved Sound Level Meters

A Type Approved Sound Level Meter is a noise measuring instrument that has been tested and verified as meeting a standard, such as IEC 61672-2, by a recognised testing laboratory, such as the PTB in Germany, the LNE in France or Applus+ in Spain.

The Optimus sound level meters have been designed to meet the requirements of IEC 61672 (and the corresponding EN and DIN standards) and so these independent test have been carried out to verify that that the instruments do indeed meet these requirements. The IEC 61672 standard is in three parts:

The first of these is known as Electroacoustics - Sound level meters - Part 1: Specifications and this defines the performance specifications for the instruments.

Part 2 is known as Electroacoustics - Sound level meters - Part 2: Pattern evaluation tests and this defines the tests and checks that a laboratory must carry out when they are testing an instrument for Type or Pattern approval. These are the tests that the PTB have been carrying out on the optimus sound level meters.

Part 3 is known as Electroacoustics - Sound level meters - Part 3: Periodic tests and this defines the tests that should be carried out during a Periodic or routine verification.


More information about Type Approved Sound Level Meters

The following blog posts provide more inforamtion about Type Approval:

What is a Type Approved Sound Level Meter?

Type Approved Sound Level Meters & Noise Measurement Instruments from Cirrus Research

PTB Type Approval for the optimus sound level meters

Cirrus Sound Level Meters with Type Approval

Optimus Sound Level Meters

The following Optimus Sound Level Meters carry Type Approval to IEC 61672-1:2002:

  • CR:161A Class 1 Optimus Red Sound Level Meter
  • CR:161B Class 1 Optimus Red Sound Level Meter
  • CR:161C Class 1 Optimus Red Sound Level Meter
  • CR:1710 Class 1 Optimus Green Sound Level Meter
  • CR:171A Class 1 Optimus Green Sound Level Meter
  • CR:171B Class 1 Optimus Green Sound Level Meter
  • CR:171C Class 1 Optimus Green Sound Level Meter
  • CR:191BE Optimus Sound Level Meter
  • CR:193BE Optimus Sound Level Meter

A complete list of the approvals for the Optimus sound level meters can be found on this blog post.


CR:260 Series Sound Level Meters

The following Sound Level Meters carry Type Approval

  • CR:261S Class 1 Vehicle Noise Sound Level Meter

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