D-0112389-I – 2022/04
Sera™ - Instructions for Use - EN Page 75
7.6 General information about specifications
Interacoustics continuously strives to improve its products and their performance. Therefore, the
specif ications can be subject to change without notice.
The performance and specif ications 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:
Interacoustics A/S
Audiometer Allé 1
5500 Middelf art
Denmark
Tel.: +45 6371 3555
Fax: +45 6371 3522
E-mail: info@interacoustics.com
Web: www.interacoustics.com
7.7 Appendix A: Stimulus
Another stimulus than specif ied 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 specif ied
in the standard. However, it is designed as a sum of cosine f unctions in the frequency domain. The
frequencies of the cosines are multiples of the stimulus repetition rate. With equal intensity f or each
frequency, to achieve the same linear magnitude f requency response. However, the phase of the cosine
components is delayed according to the cochlear delay of the according frequency to achieve a more
effective stimulus design. The f requency range of the stimulus is from 200 Hz up to 11 kHz.
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