78 The DSL/NAL-NL1 Module WinCHAP User’s Manual
8. Select the Fitting Type. If Bilateral is selected, make sure that the
audiometric data for both ears is entered in the Audiometry window.
9. Set the
Channels, Measured RECD coupler, Tubing, and Venting selec-
tions.
10. Click
Back to close the Settings window. If you haven’t already, click
NAL in the left column of the window to enter the NAL-NL1 window. See
Figure 6.4.
13. Set up the analyzer for a real-ear or a coupler measurement. Make sure
that the sound chamber or the sound field speaker is leveled.
6.4.2 Performing the measurements
1. Select whether you are performing a Coupler measurement or a Real-ear
measurement.
2. Select whether you want to want to display measurement results and tar
-
gets in dB
Gain or dB Insertion Gain. The SSPL selection is used for mea-
suring the saturation response of the aid.
3. Display the target to which you are measuring by selecting it in the target
column.
4. Select the curve you are going to measure. A checkmark indicates the cur
-
rent selected curve.
5. Select the Source Type for the curve. Choose between
Pure-tone,
Composite, DS ANSI (Digital Speech ANSI), and DS ICRA (Digital Speech
ICRA). The target will automatically adjust to fit the selected source type.
See Section 6.3.7 for details on pure-tone measurements.
6. Select the amplitude SRC (source) of the curve. Choose between 40 and
100 in 5 dB increments. (95-100 dB SPL is only available for coupler
pure-tone measurements.)
7. Click
Start to start the measurement. If using a real-time signal, wait for
the measurement to stabilize and click
Stop to stop it.
8. Repeat steps 3-7 to take any other desired measurements. WDRC aids are
usually measured at 50, 65, 80, and 90 dB SPL. Linear aids are generally
only measured at 65 and 90 dB SPL. See Figure 6.4.2.
9. Click
Save in the toolbar to save the measurement.
10. Click View Curve Data underneath the measurement graph to display the
numerical results.
