9
3 Useful information about the device
3.5.3
Switching off the noise
As soon as you put on the headphones, you will hear continuous
noise. This can be switched off between two measurements to
protect your hearing.
Switching noise off/on
Action
What happens? / Why?
Information
in display
1.
Press
z
Noise will be switched off
z
Loudspeaker symbol will
appear
2.
Press
z
Noise audible again
z
Loudspeaker symbol
hidden
Note:
The loudspeaker key also starts and stops meas-
urements. This means that if you do not wish to
hear noise during a measurement, you will have to
remove the headphones.
3.6
Automatic shut down
The
Stethophon 04
switches off automatically
z
if there is insufficient battery power
.
(
BAT
will appear briefly in the display.)
In some cases this may also happen immediately after switch-
ing the device on! Replace/recharge the batteries (see Sec-
tion 6.3).
z
if the device has not been used for
10 mins
(no key pressed)
or there has been no change in the display. (
APF
will appear
briefly in the display.)
The automatic shut down function does not work when a micro-
phone is plugged in.
