70 The DSL/NAL-NL1 Module WinCHAP User’s Manual
Probe mic
Custom earmold
To 3A
insert earphon
e
Figure 6.2.4.2—RECD real-ear measurement setup
6.2.5 Performing the REDD measurement
The REDD gives you a custom HL to SPL transform. You use your FONIX ana-
lyzer to measure the SPL output of the HL input of your FONIX audiometer.
Take this measurement in the Audiometry window.
You must have both a FONIX hearing aid analyzer and a FONIX audiometer
connected to your computer at the same time to perform this measurement
automatically.
1. Put the earhook on the client’s ear and attach the probe microphone.
2. Insert the probe tube into the client’s ear.
3. Put the TDH earphones onto the client’s head or insert the insert ear
-
phones. (Use the transducer you used to take the audiometric measure
-
ments.) See Figure 6.2.5A.
4. If you are using a 6500-CX, do the following. Otherwise, skip to step 5.
a. Enter Probe mode by pressing [PROBE] on the main module.
b. Press [START/STOP] to start the composite source.
c. Press [
∧] repeatedly until the source is completely turned off.
5. Select
Measured in the REDD box in the Audiometry window.
6. Click Get REDD in the Audiometry window. This will open the REDD
measurement window. See Figure 6.2.5B.
7. Click Start Test to start the pure-tone sweep measurement.
