New approach: choosing and using acoustic sensors
 

With unique transducer combinations, G.R.A.S. is introducing a new approach to choosing and using acoustic sensors.
 

Mixing up externally polarised and prepolarised microphones and preamplifiers or using wrong calibration data in the system setup is time consuming and often undiscovered until a whole set of measurement data is analysed and consequently discarded.
 

Pre-assembled sets fix selection problems
 

The Type 46 sets of pre-assembled G.R.A.S. microphones and preamplifiers solves this problem. A carefully selected microphone + pre-amplifier combination is used to obtain the best possible properties and reliability, thus optimising user workflow and minimising typical handling errors.
 

These sets are assembled in a dust-free environment to avoid contamination of the interface between the microphone and preamplifier and are sealed with a label. If desired, this label can be removed and the set dismantled.
 

Easy selection: the hard work has been done
 

These sets have been designed to fulfil typical measurement needs. Use the table to identify the input type you have and then choose the appropriate properties for your specific application.
 

Better value: taking price out of the selection process
 

Simplifying your choices - all G.R.A.S. ½" microphone sets are the same price and all G.R.A.S. ¼" microphone sets are same price (whether LEMO or CCP). Letting you worry about the capability and performance you need and not fiddling with the budget!
 

Plug & Play
 

The microphone sets can be connected directly to all professional measurement systems and 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 microphones and they will identify themselves to your equipment (with their specific properties, types and calibration data). This convenient feature is especially appreciated by multi-channel users.
 

Cables
 

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

Note that longer cables will influence the upper frequency and dynamic ranges. More information about this can be found on the www.gras.dk website.
 

Calibration data included
 

All microphone sets are delivered as a unit and are calibrated accordingly. They include calibration charts with 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
 

Use a reference sound source for frequent verification of the measurement chain. G.R.A.S. supplies a 114 dB sound calibrator for this purpose (link). Depending on use and your internal quality control requirements, we recommend that these sets are re-calibrated at least every second year.
 

Warranty - extended peace of mind
 

G.R.A.S. offer a 5 year warranty on Type 46 sets.
 

Service and repair
 

Damaged diaphragms, cables or connectors can all be exchanged (same for the microphone capsule and preamplifier unit).
 

Other G.R.A.S. Sound and Vibration products

• Easy selection Microphone Sets 
• Microphones
• Preamplifiers
• Power Modules
• Simulators:
  • Couplers
  • Artificial Ears and Ear Simulators
  • Mouth & Pinna Simulators
  • KEMAR Head & Torso Simulator
  • ANSI/ASA S12.42 test fixture
  • Telephone Test Head
  • Hearing-protector Test Fixture
• Pistonphones and Calibration equipment  
• Intensity microphones and calibrators
• Intensity Probes
• Accessories