Frye FONIX 7000 - Manual (Page 139)

Real-Ear Measurements
131
WARNING
Choose OUTPUT LIMITING carefully (see procedure below).
You don’t want to damage your clients’ hearing or to cause
them discomfort during testing. To ensure safety and comfort,
the 7000 Test 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 “OUTPUT OVER LIMIT” appear on the
screen, and the signal source is automatically turned off and
the measurement stopped.
The default setting for OUTPUT LIMITING is 120 dB SPL.
You can set the OUTPUT LIMITING to any level between 90
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,
EXTREME CAUTION is advised when performing real-ear
SSPL measurements.
When using pure tones, set Noise Red (Tone) to OFF in the
local menu of the real-ear measurement screen to increase
the test speed. The pure-tone SHORT signal is recommended
when testing output levels at 90 dB SPL.
1. Push [MENU] from the real-ear measurement screen to
enter the local menu.
2. Use [∨, ∧] to select OUTPUT LIMIT under Measurements.
3. Use [<, >] to choose the desired limit.
4. Return to the measurement screen by pressing [EXIT].