Pistonphone Type 42AA

The Pistonphone Type 42AA is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 114 dB re. 20µPa (equivalent to 10 Pa) at 250 Hz, or 105.4 dBA re. 20µPa. Each Type 42AA is within 0.1 dB of the nominal value and is delivered with an individual calibration chart and a barometer for Class 1 static pressure corrections. For Class 0 static pressure corrections, a precision barometer is required.

The Type 42AA can be used both for field checks of complete measurement systems as well as for laboratory calibrations of measurement microphones. It complies with the requirements of IEC 942 (1988) Class 1 and is PTB approved.

• RA0078
  - Adapter for G.R.A.S. Hydrophone Type 10CD

• RA0025 and RA0072
  - Octopus couplers for calibrating up to eight microphones simultaneously. The main coupler of an octopus coupler, which replaces the pistonphone’s normal coupler, is connected to eight separate couplers via narrow-bore flexible tubes 50 cm long. Each of these separate couplers can accept a microphone or a plug substitute. Two versions are available: The RA0025 for calibrating ¼" microphones, as well as G.R.A.S. Type 40PR and Type 40PQ Array Microphones, and the RA0072 for calibrating ½" microphones. Both are convenient and faster ways of calibrating microphone arrays.   
  

  Download PDF Data Sheet: pd_42AA_ver_09_11_04.PDF