Siemens SD 270 Operating Manual page 28

Diagnostic audiometer
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ABLB
SISI
28
Alternate Binaural Loudness Balance: Routes
tone to each earphone alternately. Use the SI-
GNAL rotary control to adjust the Left channel
level and the MASK rotary control to adjust the
right. Pressing the PRESENT key interrupts the
signal presented.
Short Increment Sensitivity Index: Presents a
tone continuously at the level and frequency dis-
played. Pressing the PRESENT key increases the
level by the increment shown on the lower line
of the display. Change this increment by using
the UP & DOWN softkeys. Softkey 4 switches bet-
ween the initial display and a counter that logs
and displays the results of the test as a percen-
tage:

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