Using the FONIX 7000 to Verify Coupler and Real-Ear Performance ...

Real Ear Measurements 48
the insert earphone or headset @ 250, 500, 1000, 2000, 3000 and 4000 Hz.
8. Complete a practice run @ 1000 Hz.
9. Use an ascending procedure.
10. Increase 10 dB until patient indicates he/she heard the sound.
11. Decrease 10 dB and begin second ascend in 5 dB steps until patient once again
indicates he/she heard the sound. Find the lowest level the patient responds 50%
of the time he/she has just heard the sound (i.e., threshold).
12. Repeat at the other test frequencies.
13. At the first test frequency (1000 Hz), present a 70 dB HL signal. On the monitor,
the clinician should see a value greater than 70 dB SPL. If the value is less than
70 dB SPL, then either the probe is clogged or pinched. The clinician needs to
replace or reposition the probe tube.
14. The difference between the dial reading on the audiometer (70 dB HL) and the
measured SPL seen on the monitor is the REDD (Real-Ear-To-Dial-Difference).
Quickly repeat this measure at 2000, 3000, 4000 and 500 Hz.
15. When the clinician establishes the TCT at each frequency, simply note the value
in dB SPL on the monitor. Record that value (as well as the corresponding value
in dB HL) on the Table below and place it in the patient’s chart to be used later
when measuring the REAR at the time of the fitting.
Table to document TCT in dB HL and SPL and placed in the patient’s chart.
Right Left
Hz HL SPL HL SPL
500
1000
2000
3000
4000