Coupler Measurements 61
3.2.3 Saving the Leveling Information
The FP35 can store leveling so that you do not need to re-level the sound cham-
ber every time you turn on the FP35 analyzer.
To store leveling:
1. Press [MENU] from the Opening screen to enter the Default Settings Menu.
2. Press [F3] to enter the Calibration Menu.
3. Use the [∨, ∧] keys to move the cursor to the selection “Store Chamber
Leveling in EEROM”
4. Press [START/STOP]. The FP35 will confirm that you want to store the lev-
eling.
5. Press [START/STOP] again to proceed.
6. Press [EXIT] twice to return to the Opening Screen.
3.2.4 Changing the Leveling Source
By default, sound chamber leveling is performed at 90 dB SPL. (Real-ear level-
ing is performed at 70 dB SPL.) In special circumstances, you may want to
perform coupler measurements with the aid positioned in front of an upright
speaker. For instance, this is a technique often used to test directional hearing
aids.
A loud leveling source, such as the default 90 dB SPL, is more accurate than
softer leveling sources because there is less noise interference. However, the
loud leveling source also requires the speaker to be close to the microphone.
When you move the microphone away from the speaker, the leveling source will
often have to be lowered. So, when performing coupler measurements with an
upright speaker, it is often useful to turn the leveling source down.
To do this:
1. Press [MENU] from the Coupler Multicurve or Target Coupler screen to
enter the local menu.
2. Press [NEXT] to enter the Advanced menu. (If the USER LEVEL is set to
ADVANCED in the Default Settings menu, you will need to press [NEXT]
again to go to the Custom menu.)
3. Use [
∨, ∧] to select LEVELING SOURCE.
4. Use [<, >] to choose the desired level.
5. Press [EXIT] to return to the measurement screen.
