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0611 RM500SL User’s Guide Version 2.8 Page 53
10.5 Max TM SPL setup
FastFacts 10.5: Max TM SPL setup
10.6 ABR nHL to eHL setup
FastFacts 10.6: ABR nHL to eHL setup
The Max TM SPL safety feature allows you to set a limit on the SPL, measured by
the probe microphone, above which a test terminates. The MAX TM SPL limit is
shown on all REM screens. The default limit is 120 dB.
To choose a different Max TM SPL setting:
1) Press <Setup>, then highlight and <PICK> [Max TM SPL].
2) Highlight and <PICK> the current Max TM SPL setting.
3) Highlight and <PICK> the desired Max TM SPL setting from the drop-down list.
4) Press <Continue> to exit Setup.
This Max TM SPL setting will be in effect until you change it.
If the limit is exceeded during a real-ear test, the RM500SL will terminate the test
and display the message “MAX TM SPL EXCEEDED”. You must then decide to
either adjust the maximum output limiting of the hearing instrument or increase the
Max TM SPL setting following the steps above.
If the MAX TM SPL limit has been disabled, a notice will appear on each real-ear
screen. Also, a message reminding you that the MAX TM SPL limit has been
disabled will appear when you select a real-ear test.
Estimated Hearing Level (eHL):
An estimate of the behavioral pure tone
threshold that accounts for a measured ABR threshold.
Normalized Hearing Level (nHL): (a) Stimulus peak-to-peak equivalent SPL (pe
SPL) at ABR threshold relative to the average stimulus pe SPL at ABR threshold
of a normal-hearing jury OR (b) stimulus SPL at ABR threshold relative to the
average stimulus SPL at behavioral threshold of a normal-hearing jury for the
same stimulus. (Note that in this latter case, nHL is equivalent to eHL).
In Speechmap/DSL you have the option of entering ABR thresholds in either eHL
or nHL. If eHL is selected, the threshold is treated as if it were a behavioral pure-
tone threshold. If nHL is selected, the entered data will first be converted to eHL
before SPL threshold and fitting targets are calculated. To do this, appropriate eHL
to nHL conversion factors must be applied. You can choose to apply default
conversion factors or enter new ones for each client.
This setup allows you to select the default conversion factors that are applied in
Speechmap/DSL to convert ABR nHL threshold to eHL threshold.
1) Press <Setup>, then highlight and <PICK> [ABR eHL to nHL].
2) Highlight and <PICK> [DSL defined] or [User defined]
3) For [User defined], enter conversion factors using a mouse, the keypad or a
keyboard. See 18.2:Assessment data entry.
When using the barcode option, both entered nHL data and the nHL to eHL
conversion factors are printed as a single barcode. See 3.3: Barcode data input.