5
Section 1: Coupler Tests of FM Systems
Figure 1.1.1A
Figure 1.1.1B
Figure 1.1.1C
Button earphone
Internal FM receiver
Silhouette coil
External FM boot receiver
Direct audio input
Button earphone (Figure 1.1.1A)
1.
Remove the ear-level adapter from the HA-2 coupler, if necessary.
2.
Snap on the button earphone to the HA-2 coupler.
3.
Place the coupler/hearing-aid assembly on a foam pad outside the text box, 2 ft. (60
cm) from the transmitter during testing.
BTE case with microphone/earphone or BTE aid with internal FM receiver, external FM
boot receiver, or direct audio input (Figure 1.1.1B)
1. Attach the ear-level adapter to the HA-2 coupler, if necessary.
2.
Attach the BTE hearing aid to the HA-2 coupler.
3.
Place the coupler/hearing-aid assembly on a foam pad outside the test box, 2 ft. (60
cm) from the transmitter during testing.
BTE aid with silhouette coil (Figure 1.1.1C)
1. Attach the ear-level adapter to the HA-2 coupler, if necessary.
2.
Attach the BTE hearing aid to the HA-2 coupler.
3.
Place the coupler/hearing-aid assembly on a foam pad outside the text box, 2 ft. (60
cm) from the transmitter during testing. Choose a location free of stray magnetic
fields (away from video monitors and other electrical devices). It may be necessary
to turn the analyzer’s video monitor off during testing.
4.
Align the silhouette coil underneath the hearing aid, simulating the way it would be
worn on the ear.
Foam Pad
Foam Pad
Foam Pad
to Analyzer
to Analyzer
to Analyzer
FM
Receiver
FM
Receiver
FM
Receiver
