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.
Summary of Contents for Avalon FM20
Page 2: ......
Page 6: ...6 ...
Page 38: ...3 Installation Instructions 38 ...
Page 46: ...4 Theory of Operation 46 ...
Page 155: ...10 Repair and Disassembly 155 11 Put the two halves of the display assembly together as shown ...
Page 167: ...10 Repair and Disassembly 167 10 Remove the four screws holding the recorder chassis ...
Page 169: ...10 Repair and Disassembly 169 12 Remove the RFI bracket 13 Lift out the recorder chassis ...
Page 254: ...12 Specifications 254 ...
Page 259: ......
Page 260: ...Part Number 453564541271 Published in Germany 11 14 453564541271 ...