40 US/50 User's Guide
Appendix A
+V
0
-V
t
Sound Pressure Level
Spatial Pattern
The applicator produces a collimated
(cylindrical) beam with an area of 4 cm² as
measured 5 mm from the faceplate surface
when the radiation is emitted into the
equivalent of an infinite medium of distilled,
degassed water 30° C, and with line voltage
variations in the range of ± 10% of the rated
value.
The beam of the applicator is circular in all
planes parallel to the applicator face. If a cross
section is taken through the axis of the beam,
the pattern varies with distance from the face.
A few inches from the face (far field), it is a single
smooth bell shaped curve. Nearer the face (near
field), the pattern varies more due to phase
cancellations.
Electrical Stimulator
Waveform................ asymmetrical alternating
current (no load)
Output Voltage..... 110 V peak into 1K ohm load
28 V peak into 100 ohm load
Output Intensity ..................................... 56 µC
maximum charge per pulse
into 100 ohm load
Pulse Width ............................................. 200 µs
at 50% V maximum
Frequency
Pulsation Mode.............................. 1 to 80 pps
Tetanize Mode ........................................ 80 pps
Surge Mode ............................................ 80 pps
Surge Duration (seconds)................... variable
from 3.75 on/off to 0.375 on/off
NEAR FIELD
FAR FIELD
EFFECTIVE RADIATING AREA
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