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5. Free-field Warble Tones Calibration
5.1. Entering Free Field Calibration Mode
• Press OPTIONS and then the NEXT key to move through the
menu items and access the ‘Set freefield levels’ screen.
Press the YES key.
• Press QUIT and you are now presented with the freefield
calibration screen for Warble tones.
• The audiometer will now output 70dBHL from the Left channel.
As reference for the calibration of warble tone sound pressure
levels, the values from ISO 389-7, Table 1 are used (binaural,
on-axis).
Freq.
[Hz]
125 250 500 750 1k 1k5 2k 3k 4k 6k 8k
dB
SPL
92 81 74 72 72 70.5 68.5 64 63.5 72.5 81.5
If a calibration of the speech channel has already been carried out:
Adjust the calibration level for the 1kHz, Left channel using the
SIGNAL control to reach the SPL level specified above as measured
by the SLM.
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