Real-Ear Measurements 133
Figure 5.4B—Insertion Gain Screen
5.4.1 Measuring the Unaided Response
The first step in taking an insertion gain measurement is to measure the unaid-
ed response. You can do this from either the Unaided & Aided Response Screen
or the Insertion Gain Screen.
If you are using the average unaided response, skip to the next section.
1. Place the probe tube in your client’s ear as described in Section 5.2.4. Level
the sound field speaker. See Section 5.2.6.
2. Press [MENU] and make any necessary menu selections. See Section 5.8.2
for a list of menu selections. Press [EXIT] to exit the menu.
3. Press [F4] to select the signal type. Use COMP if you have the Composite
Option. If not, use NORM.
4. Press [F2] to select CUSTOM UNAIDED.
5. Use the [
∨, ∧] keys to adjust the source amplitude to 65 or 70 dB SPL.
6. Have the client sit still in the same position they were in during leveling,
and press [START/STOP] to begin measuring the unaided response. If you
are using the composite signal, press [START/STOP] when satisfied with the
measurement.
7. The real-ear unaided response (REUR) will be displayed on the graph as a
dotted line marked with the letter N.
