Welch Allyn GSI 38 - Equipment Required for Calibration

is performed by the 226 Hz band pass filter (U65). The filtered RMS microphone signal
is
rectified to a dc level for input to the Microprocessor A/D convertor.
This filtered signal
is level adjusted (U59) by the Microprocessor to establish an optimum operating range for
the system during the tymp sweep or reflex testing.
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