17
4 Measuring
4.3.2
Using an external microphone
The
Stethophon 04
can record the structure-borne noise of the
object of examination either using the device's internal or an ex-
ternal microphone.
Using an external microphone is preferable if it makes examina-
tion of the object easier (e. g. setting the microphone up on sur-
faces). Optional accessories for the device include, for example,
the external
EM 30 and EM 35 Piezo microphones
.
Points to note when working with an external microphone
z
The external microphone can be plugged into the microphone
socket when the device is both switched on and off.
z
Once the microphone is connected to the device the status
message
MIC
will appear in the display.
z
The device can
only be switched off if the microphone is
first unplugged
from the microphone socket.
z
Only
filter levels 1-5
are available.
z
The device's
automatic shut down
function is
disabled
. Re-
member to switch the device off yourself when not in use for a
long period to save the batteries.
