Chapter 4
Custom transducers can be calibrated if the target SPL at each probe tone fre-
quency is within 10dB of the GSI default value.
To set the target SPL of custom transducers:
Step 1
Set switch #2 of the calibration options DIP switch to ON when preparing for
calibration. The up/downTARG SPL softkeys will then be active during calibration.
Step 2
Adjust the TARG SPL at each probe tone frequency to the required level during the
calibration of CONTRA and IPSI SPL.
Step 3
When calibration is complete, enter the Normal Mode and verify that “NON-GSI”
is displayed next to dBHL on the LCD.
Transducers must be clean and completely inserted into the HA-1 coupler.
Dirty
transducers or incomplete insertions into the coupler will result in erroneous data.
Always insert the probe or contra phone transducer into the coupler so that no
gap exists between the main body of the transducer and the coupler. The ex-
ample below shows the contra phone incorrectly and correctly inserted into
the coupler.
Gap: No Gap:
Incorrect
Correct
Grason-Stadler
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