Reference calibrator
Typical applications and use
- Reference calibration source
- Precision microphone calibrations
- Microphone comparisons
- P-I index measurement at 250 Hz or 251.2 Hz
- Calibration independent of atmospheric pressure and altitude
Sound pressure level: 114 dB
Frequency: 250 Hz
IEC: 60942
GRAS 42AA Pistonphone, Class 1
The GRAS Pistonphone 42AA is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters, and other sound measuring equipment.
Sound pressure level: 134 dB
Frequency: 250 Hz
ANSI: S1.40
IEC: 60942
GRAS 42AC Pistonphone, high pressure, Class 1
The GRAS 42AC Pistonphone, high pressure is a precision sound source for calibrating microphones. It is battery operated and produces a constant sound pressure level of 134 dB re. 20µPa (equivalent to 100 Pa) at 250 Hz, or 125.4 dBA re. 20µPa.
Sound pressure level: 114 dB
Frequency: 250 or 251.2 Hz
ANSI: S1.40
IEC: 60942 (2018) LS
GRAS 42AP Intelligent Pistonphone Class 0
The GRAS 42AP Pistonphone is a battery-operated, precision sound source for accurate and reliable calibration of measurement microphones, sound level meters and other sound measuring equipment.
Standard: IEC 61043
Special feature: Calibration coupler with two matched calibration chambers for GRAS Rugged Intensity Probes.
GRAS 51AC Sound Intensity Calibration Kit
The 51AC Sound Intensity Calibration Kit is a ready to use kit for sensitivity and phase calibration of GRAS Rugged Intensity Probes (50AI-LP, 50GI-P, 50GI-RP). The kit consists of a calibration adapter with two calibration chambers, a GRAS 42AA Pistonphone, Class 1, and a GRAS ZC0002K Barometer.
