FONIX® FP35 Touch - Frye Electronics

Chapter 3 61
Coupler Measurements
Coupler measurements are electro-acoustical tests performed using a coupler
acting as an artificial ear inside the sound chamber. This chapter describes how
to perform coupler measurements manually in the Coupler Multicurve screen.
For instructions on how to perform ANSI, IEC, or other automated test sequences,
see Chapter 4, Automated Test Sequences.
In the Coupler Multicurve screen, you can perform up to four different coupler
frequency response measurements using a variety of puretone and broadband
signals (the Composite/Digital Speech Option is required for broadband signals).
Test results can be displayed in terms of either SPL (output) or Gain.
To enter the Coupler Multicurve screen, press [F3] from the Opening screen.
If this opens the Coupler Target or Coupler EarSim screen, use the [NEXT] or
[BACK] keys to go to the Coupler Multicurve screen.
3.1 Coupler Multicurve Display
Figure 3.1—Coupler Screen
Refer to Figure 3.1 for the following explanation of the graphical display: