4.8
CALIBRATION MODE DIP SWITCH IN-DEPTH DESCRIPTION
The Dip Switches,
located beneath the HL dial, will be
described
v
in reverse numerical order. The reason for this is that they are
be.
in the order in which we anticipate the frequency of usage
will
4.8.1 DIP SWITCH S4
NOTE :
IF
DEFAULT DATA IS LOADED, DIAGNOSTIC MODE D4 PROCEDURE
MUST
BE
PERFORMED!
DEFAULT CALIBRATION DATA
All calibration data or other data stored in the EEPROM will have
a corresponding set of default data stored in EEPROM which may be
used to initialize the EEPROM.
This is performed by entering the
Calibration Mode with Dip Switch
#4
in the ON position.
Transducer SPL calibration data:
This default data is typical of transducers supplied with the
instrument.
Custom RTL values:
This default data consists of the standard GSI RTL values for the
transducer types supplied with the instrument.
Custom RTL vs.
GSI RTL selection status:
This will default to the GSI RTL selection.
Attenuator 2.5 V maximum output level limit:
This will default to an attenuator limit for each stimulus.
Checksum:
The
EEPROM checksum
is calculated using the
contents of
the
EEPROM after all default data has been stored.
4.8.2 DIP SWITCH S3
CUSTOM
RTL
SELECTION MODE
This mode enables selection of the displayed custom RTL values
only and does not allow adjustment of the transducer's output
level.
If the user desires to use alternate transducers, this mode would
normally be selected first to set the custom RTL values and
then
the
earphone
SPL calibration would be performed.
When
the
Calibration Mode is entered with Dip Switch
#3
in
the ON
position,
Dip Switch
#3
can be used to switch from the custom SPL
selection to
the
transducer SPL mode while
remaining in
the
Calibration Mode.
25
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