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device rating values are added together to indicate how usable they are together. For example, if a hearing aid meets the M2
level rating and the wireless mobile device meets the M3 level rating, the sum of the two values equals M5.
Under the standard, this should provide the hearing aid user with normal use while using the hearing aid with the particular
wireless mobile device. A sum of 6 or more would indicate excellent performance.
However, these are not guarantees that all users will be satisfied. T ratings work similarly.
M3
+
M2
=
5
T3
+
T2
=
5
The HAC rating and measurement procedure are described in the American National Standards Institute (ANSI) C63.19 stan-
dard.
135 Health & Safety
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