Frye FONIX FP40D - Manual (Page 89)

Real-Ear Measurements 81
WARNING:
Choose OUTPUT LIMITING carefully (see procedure below). You do not want to damage
your client’s hearing or cause them discomfort during testing. To ensure safety and com-
fort, the FP40 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
the program automatically stops.
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, we recom-
mend extreme caution when using pure tones for “in-situ” SSPL measurements.
Whenever the output limiting function has stopped the test signal, you
must either turn down the hearing aid, lower the source SPL, or change the
output limit.
To view or change the OUTPUT LIMITING setting:
1. Push F1 [SETUP MENU].
2. Use the AMPLITUDE & FREQUENCY knobs to move the cursor to PROBE PARAM-
ETERS — OUTPUT LIMITING
3. Use the [START/STOP] button to choose the desired limit.
4. Return to PROBE by pushing F1 [EXIT MENU].