ULTRATHERM 908i
21
gbo Medizintechnik AG 2004
Version 1.2
measured by means of the oscilloscope. The measurement has to be performed without any
earthing connection which, otherwise, would negatively influence the measurement results. The
output power is to be calculated from the measurement values of pulse amplitude (U
m
), pulse
duration (t
p
) and pulse period (T) in the following way:
for CW operation:
the value P
CW
[W] corresponds to that of
U
m
2
[V]
for pulsed operation:
the value of P
p
[W] corresponds to that of
U
m
2
[V]
multiplied by the factor t
p
/T .
•
Set the „
DIPLODE
“ applicator and treatment time.
•
In the different modes of operation the following power values are to be checked, where at least
9 LEDs of the bar indicator must be lit after the tuning:
Made of operation
Min. power range
[W]
Max. power range
[W]
CW mode
9
±
0.5
200
±
20
Pulsed mode 70 Hz
3
±
1
30
±
3
Pulsed mode 350 Hz
3
±
1
30
±
3
•
Remove the test aerial from the unit to be tested.
4.8.2. Capacitor-field applicator
•
Connect the resistance phantom circuit to X004/X005.
•
Set the „Electrode-to-skin distance“ to 35 mm.
•
Set the „Capacitor-field electrode, large“ applicator, CW mode and treatment time.
•
Set „200 W“ by means of the power selector.
•
After the tuning run, at least 8 LEDs of the bar indicator must be lit.
4.8.3. Auxiliary check of the power output
•
Connect the corresponding applicator to the output of the unit.
•
A box-type plastic or glass container (5 1 to 10 1) is to be filled with a 0.9-% salt solution.
•
Position the applicator to the immediate vicinity of the container.
•
After the tuning run, set the output power of the unit to „200“ W and change the position of the
applicator so that as much as possible LEDs (7 to 10) of the bar indisator are lit.
•
As additional control the assigned RF indicator can be used by positioning in front of or
between the electrodes. In this case, the active surfaces of the capacitor-field electrodes are put
together.
