FONIX® 8000 - Frye Electronics

Coupler Multicurve 75
Figure 3.4.10A—Testing with the Sound Chamber Telecoil Board
Testing with the Telewand
When the ANSI Option is ordered with the 8000 Hearing Aid Test System, the
Telewand device is also included. Otherwise, you can order it from the factory
as an optional accessory. The Telewand is supposed to provide a more realistic
test of the telecoil features of a hearing aid than the built-in telecoil in the
sound chamber because it more closely simulates the magnetic field produced
by a telephone receiver.
1. Set up the hearing aid for testing in the usual way by connecting it to the
appropriate coupler and inserting the measurement microphone.
2. Enter the Coupler Multicurve screen by pressing [F1] in the Opening
screen.
3. Press [MENU] in the Coupler screen to open the local menu. Set the
TRANSDUCER to TELEWAND under Source Settings and press [EXIT] to
close the local menu.
4. Use [F5] to set the Source Type to Composite.
5. Press [START] to start a composite measurement.
6. Plug the Telewand into the Telecoil connector on the back of the 8120 Polar
plot or 8050 & 8060 Sound Chambers.
7. Hold the hearing aid in one hand and the Telewand in the other hand.
Position the Telewand as you would position the receiver of a telephone.
That is, hold the Telewand a few millimeters next to the hearing aid, positioned
parallel to the body of a BTE aid or against the faceplate of an ITE
aid.
8. Look at the RMS OUT in the Curve Characteristics box. This shows the current
output of the hearing aid to the magnetic field input.