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AcouTronics B.V. | Akoestiek en Trillingen
Akoestiek & Trillingen
Everdenberg 37
4902 TT Oosterhout
Nederland

T. +31 (0)162.424421
F. +31 (0)162.425652
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Pistonfoon model 42AA, 42AC en 42AP

 

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. 20 microPa (equivalent to 10 Pa) at250 Hz, or 105.4 dBA re. 20 microPa. 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 Pistonphone Type 42AC is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 134 dB re. 20 microPa (equivalent to 100 Pa) at250 Hz, or 125.4 dBA re. 20 microPa. Each Type 42AC 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 42AC 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.

The G.R.A.S. Pistonphone Type 42AP is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters and other sound measuring equipment.

It has a built-in precision barometer and a thermometer. Via its display and RS-232 interface, the user can read the actual corrected sound pressure level, as well as the calibration temperature and ambient static pressure.

With a microphone placed in the coupler of the pistonphone, the calibration level and frequency is:

  • nominally 114dB re. 20 microPa at either 250Hz or 251.2Hz

The actual sound pressure level, corrected for static ambient pressure, is shown on the display of the Pistonphone. The display can also show the A-weighted sound pressure level after correcting it for using an A-weighting filter.

An individual calibration chart is delivered with each Pistonphone.

The Display can be switched to show any of the following:

  • Actual corrected sound pressure level in decibels
  • Actual corrected sound pressure level in decibels if measured with an A-weighting filter
  • Static air pressure in hPa
  • Calibration temperature in Celcius
  • Calibration temperature in in Fahrenheit

The frequency of the pistonphone can be programmed, via its RS-232 interface, to be either 250Hz or 251.2Hz.

 

Gras
Question
Quotation
Normen IEC 60942:2003 standard, klasse 1
Niveau 42AA: 114dB | 42AC: 134dB | 42AP: 114dB
Frequentie 42AA: 250Hz | 42AC: 250Hz | 42AP: 250Hz & 251,2Hz