Siemens SD 270 Operating Manual page 25

TALKBACK
PRINT
dB STEP
While selected (as indicated by the indicator
above the key) the signal from MIC2 is routed
continuously to the MONITOR output. Press the
key again to de-select. The talkback level may be
adjusted by the SIGNAL control while key is held
down.
Press to print audiogram; see Section 3.11 for
further details.
Enables the operator to set 2.5dB as the default
step size.
In case 2.5dB step size is not selected, 5 dB step
size is taken as default.
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