User Manual
USP-30
Ultrasound Power Meter
CONTENTS
I. INTRODUCTION............................................................... 2
II. SPECIFICATIONS ............................................................ 3
III. PUTTING THE USP-30 INTO SERVICE........................... 4
IV. HOW TO OPERATE THE USP-30.................................... 5
V. DEGASSED WATER AND TRANSDUCER
CONSIDERATIONS .......................................................... 6
VI. CONVERSION CHART - FROM GRAMS TO WATTS ..... 7
VII. WARRANTY ..................................................................... 8
VIII. TECHNICAL SUPPORT ................................................... 8
I. INTRODUCTION
The Model USP-30 Ultrasound Power Meter is designed to measure the ultrasonic power output of
diagnostic or therapeutic transducers up to 30 watts using the radiation force balance method. The
USP-30 consists of a precision mechanical balance that measures from 0.01 to 10.00 grams, a
conical target suspended on a triangular hanger, a water tank, a transducer support rod with clamp,
and a carrying case. The transducer to be tested is center-mounted over the conical target with the
transducer's radiating area immersed facedown in the water medium.
The Model USP-30 Ultrasound Power Motor measures the average ultrasonic power by measuring
the radiant force exerted by the transducer on the conical target. This target is coupled to the
precision mechanical balance that is used to measure the gram-mechanical force due to the
ultrasonic radiation. The gram force is directly proportional to the ultrasound power in watts when
multiplied by a constant of 14.65. Therefore, a 2.05 gram force would be equal to 30 watts of
ultrasound radiation.
The heart of the USP-30 system is its air-filled conical target. The weight of this target is nulled to a
minimum by using its own buoyancy. Incident ultrasound energy is mechanically transferred from
the target to the precision balance where it is manually measured. Butyl rubber walls inside the water
test tank absorb reflected ultrasound energy. This system provides a sturdy instrument with good
measurement accuracy and low cost.
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