7 Testing and Maintenance
92
To test an ultrasound transducer:
1 Switch on the monitor and the
recorder.
2 Connect the transducer to the fetal
monitor.
3 Select the fetal heart sound for this
channel.
4 Increase the loudspeaker volume
to an audible level.
5 The ultrasound transducer
contains seven piezoelectric
crystals. Basic functioning of each
can be verified by holding a flat
bottomed pencil or similar above
each crystal and moving it up and
down as shown.
6 A sound should be heard for each
crystal tested. The pencil should
be held two to three centimeters
from the transducer surface when
the test is carried out.
7 A sound should also be heard
when the transducer is moved
back and forth over a solid surface,
or the hand as shown.
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