WinCHAP User’s Manual The DSL/NAL-NL1 Module 73
eral, if you entered measured upper limit values, select Measured here.
Otherwise, select Predicted
.
8. Click
Back to close the Settings window. If you haven’t already, click DSL
in the left column of the window to enter the DSL Verification window.
See Figure 6.3.
9. 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.
6.3.2 Performing the measurements
1. Select whether you are performing 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 SPL by filling in the appropriate radio button.
3. Display the target to which you are measuring by selecting it in the tar
-
get column. If the display is set to
SPL, you can also display Thresholds,
Upper Limits, and the LTASS
.
4. Select the curve you are going to measure. A checkmark is displayed next
to the current selected measurement 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.
6. Select the 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 mea
-
surements.)
7. Click
Start to start the measurement. If performing a real-time measure-
ment, click
Stop to stop the measurement after it has stabilized.
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 6.3.2.
9. Click
Save in the toolbar to save the measurement.
10. Click View Curve Data underneath the measurement graph to display the
numerical results.
