Frye FONIX 7000, Operator'S Manual

Page: 87 / 216

Basic Sound Chamber Tests
79
8. Use [
∧, ∨
] to change the intensity of the magnetic field. The choices are:
OFF, 1.00, 1.78, 3.16, 5.62, 10.0, 17.8, 31.6, 56.2, and 100 mA/m. 31.6 is the
default source intensity.
9. Press [STOP] to stop the measurement or continue to test, as desired.
Figure 3.4.10A—Testing with the Sound Chamber Telecoil Board
Testing with the Telewand
When the ANSI Option is ordered with the 7000 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 board in
the sound chamber because it more closely simulates the magnetic field pro-
duced by a telephone receiver.
1. Follow steps 1-5 in the section above.
2. 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 hearing aid.
That is, hold the Telewand a few millimeters next to the hearing aid, posi-
tioned parallel to the body of a BTE aid or against the faceplate of an ITE
aid.
3. Look at the RMS OUT in the Curve Characteristics box. This shows the cur-
rent output of the hearing aid to the magnetic field input.
4. Position the hearing aid (with the Telewand held against it) for maximum
output. For BTE hearing aids, this usually occurs when the body of the aid