Frye FONIX FP40D - Manual (Page 143)

Custom RECD Test 135
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Appendix D: Custom RECD Test
There are two methods of getting Custom RECD measurements with the FP40 using the Probe
Option. One method uses a linear BTE hearing aid and the other uses an ER-3A Insert Earphone.
This appendix describes the BTE method. The insert earphone method is described in Section 5.6.1.
BTE / RECD Method
This simple method doesn’t require any additional equipment. A linear BTE hearing aid with a
moderate amount of gain is all that is required. The volume control should be taped in position so
that it provides about 20 dB of gain. Make sure that you go into the MENU (F1) and change the
DATA DISPLAY choice to AIDED (REAR.) Follow the steps as outlined in Part A, B, and C.
Note: The BTE method for measuring the RECD is not consistent with the DSL definition of the
RECD.
Part A: The 2cc Coupler Measurement.
1. Attach the BTE hearing aid to an HA-2 coupler.
2. Make sure the FP40 is in the Gain mode, then select a 60 dB input signal (either pure tone/
normal sweep or composite.)
3. Measure the 2-cc gain.
4. Press the DATA/GRAPH button to convert the curve to data.
5. Print and save the results.
Part B: The REAR measurement.
1. Measure and mark the probe tube depth. Adults: 25-30 mm, Children: 10-15 mm.
2. Position and setup the client just like a REAR test at a 45 degree angle and 12” from the
speaker. Place the probe tube in the ear, and the reference mic above the ear.
3. Attach a disposable earmold to the BTE hearing aid and place it in the client’s ear with the
probe tube in position, like an AIDED/REAR test. Note: Make sure the aid is OFF.
4. Level. After leveling is complete, turn the aid ON.
5. Press [F4], Target mode, then press [F1] to select right or left test ear, then EXIT.
6. Press [F2] to select IG test, adjust the AMPLITUDE knob to a 60 dB input signal (either pure
tone or composite), then press [F3] and measure the AIDED – 1.
7. Press the DATA/GRAPH button to convert the curve to data.
8. Print and save the results.