General Information About Specifications; Appendix A: Stimulus - Interacoustics Sera Instructions For Use Manual

General information about specifications

Interacoustics continuously strives to improve its products and their performance. Therefore, the
specifications can be subject to change without notice.
The performance and specifications of the instrument can only be guaranteed if it is subject to technical
maintenance at least once per year. This should be carried out by a workshop authorized by Interacoustics.
Interacoustics puts diagrams and service manuals at the disposal of authorized service companies.
Enquiries about representatives and products may be sent to:

Appendix A: Stimulus

Another stimulus than specified in the standard IEC 60645-3 is used for some Automated ABR protocols.
This CE-Chirp® stimulus has the same linear magnitude frequency response as the Click stimulus specified
in the standard. However, it is designed as a sum of cosine functions in the frequency domain. The
frequencies of the cosines are multiples of the stimulus repetition rate. With equal intensity for each
frequency, to achieve the same linear magnitude frequency response. However, the phase of the cosine
components is delayed according to the cochlear delay of the according frequency in order to achieve a
more effective stimulus design. The frequency range of the stimulus is from 200 Hz up to 11 kHz.
D-0113323-F – 2020/11
Sera™ - Instructions for Use - US
Interacoustics A/S
Audiometer Allé 1
5500 Middelfart
Denmark
Tel.: +45 6371 3555
Fax: +45 6371 3522
E-mail: info@interacoustics.com
Web: www.interacoustics.com
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