Audiometry is the technique to quantitatively determine the degree of hearing loss of a person, so that suitable medical treatment or one of the appropriate hearing aids and assistive device can be prescribed.The electronic instrument used for audiometry is called pure tone audiometer. All audiometry instruments need calibration and maintenance from time to time. The Audiometry must meet the performance and calibration set by American National Standards Institute (ANSI) and International Electrotechnical Commission (IEC). Small Portable, user-friendly Raspberry pi based Pure tone Audiometer is designed and tested. The Present paper is on calibration of said Pure tone audiometer. This article is to discuss the calibration of newly designed Raspberry Pi based Pure tone Audiometer via an earphone and Bone transducers. The common types of earphones used in hearing testing are described and the importance of calibrating these transducers is discussed and the instruments used for calibration, the performance parameters measured in the calibration process are examined. The limitations of our current methods are discussed and areas for improvement are considered.

Audiometry, Raspberry Pi, Headphones, Acoustic Coupler, Sound level meter