FONIX® 8000 - Frye Electronics

72 FONIX 8000 Hearing Aid Test System
This type of distortion is only apparent when the composite signal source is
used because pure-tone source types do not contain more than one frequency at
the same time.
Figure 3.4.8—Measuring intermodulation distortion
3.4.9 Battery Current Drain
You can measure the battery current drain in the Coupler screen if you use
battery pills (instead of regular batteries) in the hearing aid while performing
your measurements. To turn on the battery current drain measurement in the
Coupler screen:
1. Set up the hearing aid in the sound chamber for testing. You must use a
FONIX battery pill to test for current drain.
2. Close the lid of the sound chamber and latch it.
3. Press [MENU] in the Coupler screen.
4. Use [, ] to select Battery Meas under Misc Settings. (You can use
[START] to skip between groups of selections.)
5. Use [] to turn ON the Battery Meas.
6. Use [] to select Battery Size and use [, ] to select the hearing aid’s battery
size.