FONIX® 8000 - Frye Electronics

Coupler Directional Testing 133
See Figure 6.4 for the screen items being described below.
Graph:
1. Display type: SPL or Gain
2. Reference levels used to determine gain or SPL of the plots
3. Reference angles of 0°, 90°, 180° and 270°
4. Example of a polar plot curve. Curves are marked with a number corresponding
to information in the Curve Characteristics box.
Curve Characteristics box:
6. Curve designations: PL1-PLI or PR1-PRI. The current selected curve is highlighted
7. Frequency at which each polar plot curve was measured. When the Comp
DSP signal is selected, the frequency will be displayed as CMPD. When the
Composite signal is selected, the frequency will be displayed as COMP.
8. 2D-DI: The two-dimensional directivity index of the hearing aid. This gives
you a quantitative measurement of the directionality of the hearing aid.
9. Avg 2D-DI: The arithmetic mean of the directivity index of all measured
curves.
Settings box: The test settings used to measure the current selected curve are
displayed here. This box is also used to show the test settings used for the next
curve to be measured. The [F8] key toggles between showing the settings used
for the selected measurement curve and the settings that will be used in the next
measurement curve.
10. Test Mode: Manual or Simultaneous. Measurements made when the analyzer
is set to to Semi-Automatic or Fully-Automatic modes are shown as “Manual.”
11. Ang Resolution: Number of degrees between each point of the polar plot test.
For instance, when this is set to 15, measurements are taken every 15 degrees.
12. Source: Source type used for the measurement curve. Choices are Inter
Composite (interrupted Composite), Cont Composite (continuous Composite),
Inter Pure Tone (interrupted Pure Tone), Cont Pure Tone (continuous Pure
Tone). (Choose between Comp DSP, Composite, and Tone with [F5]. Choose
between Continuous and Interrupted in the local menu.)
13. Filter: Broadband filter used for performing measurements made with the
Comp DSP or Composite source types.
14. Analysis: This is shown as FFT when the source type is set to Comp DSP or
Composite. This is shown as DFT when the source type is set to Tone.
15. Avg: This shows the type of averaging used with the measurement curve and
is controlled in the local menu with the Noise Red (Comp) and Noise Red
(Tone) settings. When the source type is set to Composite or Tone, the measurement
averaging is performed in the time domain. When the source type is
set to Comp DSP, the averaging is performed in the frequency domain. (This is
the difference between Composite and Comp DSP.)