Calibration
Cal Option switch position functions are listed below:
Switch 1: Factory use only
Switch 2: GSI/custom RTL transducer calibration
Switch 3: Unused
Switch 4: Unused
Switch 5: Unused
Switch 6: Diagnostic mode
Switch 7: Self-Cal
Switch 8: Load default calibration data
The Cal Option switch settings are read by the system when the following occurs:
• The system power is on and the Cal/Normal switch is moved to the Cal
position
• The Cal/Normal switch is in the Cal position and the system power is
turned on
Switch 1: Factory use only
Factory use only
Switch 2: This position is used to activate the TARG SPL softkeys in the Ipsi and Contra
GSI/custom RTL calibration modes. The TARG SPL softkeys allow the reference threshold values
transducer calibra- (RTL) and output levels to be offset from the default GSI values by a maximum of
tion
plus or minus 10 dB
. If the TARG SPL softkeys are pressed and released, the
output level and LCD indicated value will change by 0.5 dB. If these softkeys are
pressed and held, the output level and LCD indicated value would scroll in the
direction indicated by the TARG SPL arrow. The custom calibration levels will be
stored by the system when the Data Transfer button is pressed.
NOTE
If the TympStar is set to the custom mode, all references to dB HL on the
LCD and printer during normal operation will be followed by the words
“NON-GSI”
. This is so that all test results will clearly indicate that the
stimulus SPL’s were not at GSI standard levels. Also, the program that
adjusts stimulus SPL based on total load volume is bypassed. The pro-
gram subtracts 1.0 dB per 0.1 ml for loads of 1.1 ml down to 0.15 ml
(-1.0db/0.1 ml).
Switch 3: Unused Unused
Switch 4: Unused Unused
Switch 5: Unused Unused
GSI TympStar Version 1 and Version 2 Service Manual 4 - 7
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