GSI 18
Range Extension pushbutton
This control allows the operator to present tones of up to 10 dB above the standard
maximum HL at any frequency. It will only function when the intensity is set within 10 dB
below the maximum standard intensity at any frequency. This feature requires an extra step
to access the highest available intensities. It prevents accidental presentation of the highest
intensities to normal subjects.
To enable the range extension feature, press the button labeled +10 dB while the intensity
is at the maximum for that frequency. Note that a “+” sign appears on the LCD. To disable
the feature, either press the button a second time, reduce the intensity (with the HL control
knob) to 20 dB below the standard maximum HL, or change any other parameter
(Frequency or Routing).
Tone Type selector
This control allows you to choose the type of tone presented to the test subject. It can be
set on steady, pulsed (2.5 pulses per second) or FM (warble tone).
Pulsed tones and warble tones are often used with difficult to test subjects, such as children
and hard of hearing individuals, because they hold the subject’s attention better than the
steady tone.
2-7 1718-0100 Rev. E
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