otometrics Madsen Midimate 602 Quick Manual page 19

MIDIMATE 602 & 622 Diagnostic Audiometers
8. If you have selected Ext masking, set the masking reference level. To do so turn
any of the rotary wheels while you hold down the Tape 2 key on the front panel
until a deflection of 0 dB is shown on the Stimulus VU indicator.
9. When you have completed testing of the left ear, toggle L/R Shift to switch the
signals to the left and right loudspeakers before you test the right ear.
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