Attenuators (HL Controls)
Channel 1 and Channel 2
The GSI Pello contains two independent HL rotary controls for Channel 1 test
signal and Channel 2 masking level control with a range of -10 dB HL to 120
dBHL. Maximum dB HL values apply to the mid-frequencies with earphones
only. Refer to the specific transducer for dB HL limits in the Table in Appendix
1.
Channel 1 Present Bar / Interrupt
The function of the present bar in Channel 1 is determined by the status of its
Interrupt button. When the interrupt button is in the off position, pressing the
present bar presents the stimulus to the selected transducer(s) for as long as the
present bar is depressed. The channel turns off immediately when the bar is
released. When the Interrupt button is in the on position, Channel 1 is deactivated
by pressing the present bar and activated by releasing the bar. The Interrupt
buttons in each channel operate independently of the other. Note that in the
ABLB test mode, the Interrupt pushbuttons do not operate independently of each
other.
Channel 2 Interrupt Button
When the Interrupt button is in the on position indicated by the presence of the
light bar, Channel 2 stimulus is presented. When the Interrupt button is in the off
position, no Channel 2 stimulus is presented.
Frequency Up / Down
The Frequency pushbuttons allow the selection of twelve standard audiometric
frequencies and nine high frequencies with the High Frequency license. When at
the lower limit of the frequency selection, pressing the (<) pushbutton will cause
the display to roll over to the highest frequency limit, and vice versa. If a
transducer with a narrower range is selected, only the valid frequencies for that
transducer are available. The frequency order for Auto Hz Advance is
configurable by using the Config App software. When Auto Hz is enabled,
pressing STORE will advance to the next frequency as configured.
Data Store
The Store pushbutton, when pressed, saves the current dB HL level representing
the current data point (threshold level, MCL, UCL, tinnitus, aided sound field,
cochlear implant) and effective masking level if selected, as well as transducers
and routing. Pressing Store in the Speech testing mode will save the current test
type, word list, score and other applicable speech data. In the Display Audiogram
format, the appropriate symbol appears each time the Store button is pressed.