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Easy selection

The measurement microphone sets have been combined so they fulfill our users’ typical measurement needs. Irrespective of your measurement system and application you should be able to find a set that suits your needs. First, identify your input type and sensor size based on your expected sound pressure levels and frequency range. Then choose the appropriate properties for your specific application.

Plug & Play

The standard microphone sets can be connected directly to all professional measurement systems and as indicated they are available for both CCP and 7-pin LEMO inputs.

If your measurement platform supports intelligent transducers according to IEEE 1451.4 (TEDS) you can simply plug in the microphone sets and they will identify themselves with their specific properties, types and calibration data. A feature especially appreciated by multi-channel users.


The CCP sets use high-quality coaxial cables, and the LEMO sets use a special, flexible multi-core shielded cable. Some sets have a 3 m cable included and others have cables as accessories.

It should be noted that longer cables will influence the upper frequency and dynamic ranges.

Calibration data

All microphone sets are delivered as a unit and are calibrated accordingly. The sets are delivered with calibration charts including sensitivity values and frequency response curves for the complete set. The sensitivity value can therefore be used directly in your system setup.

Verification and annual calibration

For frequent verification of the measurement chain, a sound source will be required. G.R.A.S. supplies a series of pistonphones and sound calibrators for this purpose. Depending on the use (field or laboratory) and your internal quality control requirements, we recommend that the sets are recalibrated at least every second year. Contact your local G.R.A.S. partner for factory and accredited calibration options.