Pistonphone

The Rion NC-72A Pistonphone is a standard sound source that generates a constant sound pressure of 114 dB at 250 Hz.
Designed to provide sound at an atmospheric pressure of 101.325 kPa the unit includes a barometer for compensation if required.
The pistons of the Rion NC-72A Pistonphone are manufactured with a special resin material with low friction. This manufacturing process allows both pistons to maintain their initial performance levels for about 2000 hours without the use of grease.
The Rion NC-72A Pistonphone is suitable for 1a , A a and A a microphones
Rion NC-72A pistonphone complies with the IEC 60942:2003(JIS C 1515:2004) Class LS/C
Features:
a cAllows for calibration with accuracy of + 0.15 dB
a cUsable in wide temperature and humidity range.
a cUsable as a standard sound source in laboratories or as a calibration sound source for sound level meters on site.