The
custom RTL values are stored in EEPROM by transducer
type.
The RTL values for a left transducer and a right transducer
must
be the same.
The HL limits are directly affected by any
changes
in the RTL values.
MODE INITIALIZATION
When
the
Custom RTL selection mode is selected
the
instrument
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
"
+
II
Segment = Off
HL
SELECTOR
The
HL Selector is used to select the custom
RTL level.
The
level
can be adjusted up by 0.5
dB
for each clockwise
step
and
down
by 0.5
dB
for each counter clockwise step.
The
transducer
output level (attenuator position) does not follow changes to the
custom RTL value.
The
allowable
range of the custom RTL value is
+63.5
dB
SPL.
Operation of the knob to select levels outside of this range will
not
be allowed.
If this occurs,the displayed custom RTL
value
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.
If the SPL value can not be stored
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.
26
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