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Analog or Digital, portable or desk top, our Ultrasound Power Meters offer a wide variety of accuracy and price. They make it easy to get the job done right. | ||||
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The most reliable and repeatable means of measuring ultrasound power is by the radiation force method. The transducer to be tested is centered above a 45° air-backed cone target in de-gassed water. The coupling is made to a precision balance capable of resolving ± 0.15 watts. When acoustic energy is applied to the cone, the resultant force is directly proportional to the total radiated power. The test tank is lined with sonic absorbent rubber to prevent acoustic reflection. The balance is programmed to convert milligram magnitude forces direct to a readout in watts with good resolution. Measurement accuracy of the power meter can be verified by placing a calibrated weight on the cone’s support arm. Features for the USP-50SP: Power Supply Information BC20-21113 Power supply (Universal) for all UPM's except UPM-DT-50SP Rev B and UPM-100SP Rev B w/plugs for EUR, UK, AUS, USA BC20-21119 Power supply (Universal) for UPM-DT-50SP Rev B and UPM-100SP Rev B w/plugs for EUR, UK, AUS, USA |
Measurement of power output levels of diagnostic and therapeutic ultrasound equipment has become increasingly important to determine exact patient exposure levels in case a potential risk exists to the patient. Since the Radiation Control for Health & Safety Act of 1968 and the 1976 Medical Device Amendments to the FDA Act became effective, all manufacturers of diagnostic Doppler ultrasound equipment are required to submit information regarding their maximum peak and average exposure level, beam patterns and other pertinent information. Hospitals are responsible for regularly scheduled testing (every six months) of output power and safety to maintain their accreditation. The Ultrasound Wattmeter, Model USP-100SP, is designed to measure the ultrasound power output of diagnostic or therapeutic transducers up to 30 watts. The principle of measurement is the radiant force method. The USP-100SP uses a positioning clamp to hold the transducer in de-gassed water above a conical target. The ultrasonic energy passes through the water to reflect off the target and is then absorbed by the rubber lining. The radiant power is directly proportional to the total downward force (weight) on the target. This weight is then transferred through the target support assembly to the electromechanical load cell inside the scale. The cell is in a computer-controlled feedback loop and produces a digital readout in watts of power (custom units) or grams of force. The choice of units (grams or watts) is selected by front panel pushbuttons. The USP-100SP is supplied with a plug-in 120 VAC to 12VDC 400 mA adapter (using another adapter not rated the same may damage unit). The USP-100SP has a display resolution of ±50 milliwatts. Features-USP-100SP: • Digital reading Power Supply Information BC20-21113 BC20-21119 |
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 0.15 to 30 Watts, 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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OHMIC Instruments Newest Model UPM-DT-1000PA provides the fastest response (under 3 seconds) and the highest resolution (0.001 watts) of any current UPM-DT. The UPM-DT series have been in use worldwide since 1986 and conform to the testing guidelines recommended by FDA, JCAHO, AAMI and AIUM. Power is measured by the radiation force balance method. The accuracy of the UPM-DT’s are traceable to NIST. Features for the UPM-DT-1000PA: • Fastest response time=
less than 3 seconds |
OHMIC Instruments Models UPM-DT-1PA & 10PA are precision wattmeters designed to measure the power output of diagnostic and therapeutic ultrasound transducers. The UPM-DT series have been in use worldwide since 1986 and conform to the testing guidelines recommended by FDA, JCAHO, AAMI and AIUM. Power is measured by the radiation methodand the accuracy of the UPM-DT’s are traceable to NIST. Features for the UPM-DT-1PA: • Five point certification
(NIST Traceable) |
OHMIC Instruments Models UPM-DT-1PA & 10PA are precision wattmeters designed to measure the power output of diagnostic and therapeutic ultrasound transducers. The UPM-DT series have been in use worldwide since 1986 and conform to the testing guidelines recommended by FDA, JCAHO, AAMI and AIUM. Power is measured by the radiation methodand the accuracy of the UPM-DT’s are traceable to NIST. Features for the UPM-DT-10PA: • Five point certification
(NIST Traceable) |
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The most reliable and repeatable means of measuring ultrasound power is by the radiation force method. The transducer to be tested is centered above a 45° air-backed cone target in de-gassed water. The coupling is made to a precision balance capable of resolving ± 0.15 watts. When acoustic energy is applied to the cone, the resultant force is directly proportional to the total radiated power. The test tank is lined with sonic absorbent rubber to prevent acoustic reflection. The balance is programmed to convert milligram magnitude forces direct to a readout in watts with good resolution. Measurement accuracy of the power meter can be verified by placing a calibrated weight on the cone’s support arm. Features for the USP50SP: Power Supply Information BC20-21113 BC20-21119 |
The Model UPM-DT-100SP Ultrasound Power Meter was developed to test therapeutic transducers according to AIUM, JCAHO, FDA, and NIST guidelines. OHMIC’s ultrasound wattmeters have been used worldwide since 1977 and are the most widely accepted standard for documenting the power output of medical transducers. The performance of the UPM-DT-Series has been tested and verified to be within the limits of tolerance established by the Food & Drug Administration (FDA) and National Institute of Standards & Technology (NIST). The compact and light weight Model UPM-DT-100SP meets all the requirements of a portable test instrument with the reliability and proven performance of the UPM-DT-Series. The Model UPM-DT-100SP uses the identical test tank and target configuration as the higher resolution UPM-DT-1 and UPM- DT-10. Features for the UPM-DT-100SP: Power Supply Information BC20-21113 BC20-21119 |
Ohmic’s Ultrasound Power Meter, Model UPM-30, is designed to measure the ultrasonic power output of diagnostic or therapeutic transducers up to 30 watts using the radiation force balance method. The UPM-30 consists of a precision mechanical balance which measures from 0.01 to 10.00 grams, a conical target suspended on a 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 face down in the water medium. Model UPM-30 determines 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 which 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 UPM-30 unit is its air-filled conical target. The weight of this target is nulled to a minimum by using its own buoyancy. Ultrasound energy is mechanically transferred from the target to the precision balance where it is measured. Reflected ultrasound energy is absorbed by closed-cell butyl rubber walls inside the water test tank. This system provides a sturdy instrument with good measurement accuracy and economical cost. |
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Accessories Available
• Multipurpose Holder/Positioners • Cables • Power Supplies • Batter Eliminator • Transducer holder and Clamp • Interface Cable • Pan and Pan Support • Balance Beam • Cone Assemblies • Tank Assembly |
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The UW-7 Digital Ultrasound Wattmeter provides quick and accurate verifying and calibrating readout of therapeutic ultrasound devices in the field or equipment service centers. Features: |
From UMA - The people who developed the original soft membrane/ water-coupled ultrasound wattmeter. Housed in a rugged metal case.
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