2 FONIX FP35 Hearing Aid Analyzer
1.1 A Guide to Using this Manual
The FP35 is easy to use. You can begin testing right away, and, if you do happen
to get stuck, the pop-up help menus will guide you through what to do next. In
addition, this manual contains detailed instructions and information about all
the different testing capabilities and options that the FP35 gives you.
The FP35 Operator’s Manual follows a logical, sequential order and is meant to
be read in order. If you come across a section that contains information you are
already familiar with, skip to the next section.
Notations are consistent throughout the manual. Key names are contained in
brackets, for instance [START/STOP]. Selections and settings are written in all
capitals without brackets, such as PURETONE. Screen names are capitalized,
such as Coupler screen.
The up-down arrow keys are represented by these symbols: [∧, ∨]. The right-left
arrow keys are represented by these symbols: [<, >].
1.2 Layout, Controls, & Safety
The basic layout of the FP35 analyzer and special information pertaining to
safety regulations are described in this section.
1.2 .1 Lamps and LCD
The FP35 uses a 1/4 VGA LCD screen to display graphs and numerical data.
An optional external monitor connection is also available. The FP35 analyzer
is equipped with a screen saver that will turn off the display automatically if
the FP35 is not used for a period of ten minutes or some other length of time
specified by the user in the Default Settings Menu (see Section 2.3, The Default
Settings Menu). To activate the screen after the screen saver has turned it off,
press any key.
The FP35 has only one LED. It is above the [OPERATE] key (see Figure 1.2.1).
The LED can indicate several different things by its color and by how quickly it
flashes.
• Green (not flashing)—Normal operation
• Green fast flash (every second)—Screen saver mode
•Green slow flash (every three seconds)—Off, but the circuit continues to
receive power
• Red—Error condition; unit should not be used
• Red & Green alternating—Software upload mode
