Hl Selector; Extended Range Pushbutton - Welch Allyn Grason-Stadler GSI 17 Series Service Manual

The custom RTL values are stored in EEPROM by
The RTL values for a left transducer and a right transducer
be the same. The HL limits are directly affected by any
in the RTL values.
MODE INITIALIZATION
the
When Custom RTL selection mode is selected
will be initialized as follows:
Tone Type = Current selection
Frequency = Current selection
Channel = Off
+10 dB Pad = Out
Transducer Routing = Current selection
HL Display = Current RTL level stored in EEPROM
Response LED = Off
Stimulus On LED = Off
Low Battery Segment = Current state
" + I I Segment = Off

HL SELECTOR

The HL Selector is used to select the custom
level can be adjusted up by 0.5 dB for each clockwise
by 0.5 dB for each counter clockwise step.
down
output level (attenuator position) does not follow changes to the
custom RTL value.
The allowable
Operation of the knob to select levels outside of this range will
not be allowed.
will remain the same and will flash temporarily.
FREQUENCY SELECTOR
Selects the frequency for which the custom RTL is to be selected.
ROUTING SWITCH
Inactive in this mode.

EXTENDED RANGE PUSHBUTTON

This pushbutton is used to store the custom RTL value into
EEPROM. After the RTL value is successfully stored the EEPROM
checksum will be updated and the Patient Response LED will be
turned on for 2 seconds.
successfully, the word "CAL" will be flashed on the HL display
and then the previously displayed RTL value will be restored. If
this error occurs, the calibration process may still be continued
for other frequencies.
range of the custom RTL value is
If this occurs, the displayed custom RTL
If the SPL value can not be stored
transducer
type.
must
changes
the instrument
RTL level. The
step and
The transducer
dB SPL.
value