Measurement methods
In order to be able to quantify whether or not there is an interference problem it is necessary to be able to make repeatable and reliable measurements. The quantities to be measured are:
- The level of interference signals that are likely to cause the user varying degrees of difficulty when using the hearing aid in the presence of a mobile phone.
- The level of immunity of the hearing aid to specified types of signal over a defined frequency range
- The level of radiation from the mobile phone that is present at the hearing aid when it is being used in a normal manner.
The technical details of these measurements are given in Annex A.
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