+20dB This enables tone levels to be presented with up to 20dB
higher output; press the key and then use SIGNAL to
access the extra 20dB; an indicator above the key
illuminates green to show that the function is active, and
an additional display message indicates levels greater
than 100dBHL. Note: this function will not operate if
continuous tone presentation has been enabled.
FREE This disconnects the headphones and bone vibrator,
FIELD routes signals to LINE output socket and outputs warble
tones instead of pure tones; note that no masking is
available in Free Field with warble tones; the indicator
above the key illuminates green
SPEECH Use this key to cycle through the selection of LINE input
(for recorded speech), MIC input (for live speech from
MIC 1), or speech facility off; the indicator above the key
illuminates green
BONE Outputs the signal to the bone vibrator; the indicator
above the key illuminates green
TALKOVER Hold this key to interrupt the test and route the operator’s
voice from the front panel microphone (or MIC 1 input) to
the headset; the level is adjusted with the SIGNAL
keys
TALKBACK Press this key to route the signal from MIC 2 to the
MONITOR output; the indicator above the key illuminates
green press again to de-activate; hold the button down to
adjust the talkback level using the SIGNAL keys
LEFT Press once to select the left ear; the indicator above the
key illuminates green; if the left ear is already selected
press again to store the displayed signal value as a
threshold (or a ULL if this has been selected)
RIGHT Press once to select the right ear; the indicator above the
key illuminates green ; if the right ear is already selected
press again to store the displayed signal value as a
threshold (or a ULL if this has been selected)
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