Real-Ear Measurements 125
Choose OUTPUT LIMITING carefully (see procedure below). You don’t
want to damage your client’s hearing or cause discomfort during test-
ing. To ensure safety and comfort, the FP35 system reacts automatically
when the OUTPUT LIMITING level is exceeded at the Probe Microphone.
When the level measured at the Probe Microphone exceeds the pre-set
limit, the words “PROBE OUTPUT LIMIT EXCEEDED” appear on the
screen, and program automatically stops.
The default setting for OUTPUT LIMITING is 120 dB SPL. You can set
the OUTPUT LIMITING to any level between 80 and 140 dB SPL in 5-dB
increments (see procedure below). In special cases, when you select 130
or 140 dB SPL, be aware that extra care is necessary with any output that
may exceed 132 dB SPL. Keep in mind that the sound pressure level at
the eardrum can be higher than that measured at the mid-ear canal
position, especially at high frequencies. For this reason, we recommend
extreme caution when using pure tones for real ear SSPL measurements.
Whenever the output limiting function has stopped the test signal, you
must turn down the hearing aid, lower the source SPL, or change the
output limit.
To view or change the OUTPUT LIMITING Setting:
1. Push [MENU].
2. Use the [∧, ∨] keys to move the cursor next to OUTPUT LIM.
3. Use the [<, >] to select the desired limit.
4. Press [EXIT] to return to the testing screen.
WARNING
