Ohmic UPM-DT-50SP User Manual

DIGITAL

ULTRASOUND

WATTMETER

UPM-DT-50SP

USER MANUAL

i

CALIBRATION INTERVAL, WARNINGS, CAUTIONS, NOTICES ........................................................... i

INTRODUCTION .................................................................................................................................................... 1

TEST SETUP ........................................................................................................................................................... 2

METER LAYOUT .................................................................................................................................................... 7

TESTING ................................................................................................................................................................... 9

PRINTING AND COMMUNICATIONS ........................................................................................................... 10

TROUBLESHOOTING ........................................................................................................................................ 11

MANUAL REVISIONS ......................................................................................................................................... 12

LIMITED WARRANTY......................................................................................................................................... 12

SPECIFICATIONS ................................................................................................................................................ 13

NOTES ..................................................................................................................................................................... 14

UPM-DT-50SP ULTRASOUND WATTMETER

TABLE OF CONTENTS

WARNING - USERS

The UPM-DT-50SP is for use by

skilled technical personnel only.

CALIBRATION INTERVAL

To ensure the accuracy of the UPM-DT-50SP,

Ohmic Instruments recommends that it be

calibrated at least once every 12 months.

Calibration must be done by qualified personnel.

Contact Ohmic Instruments for calibration.

ii

CAUTION - SERVICE

The UPM-DT-50SP is intended to be serviced

only by authorized service personnel.

Troubleshooting and service procedures should

only be performed by qualified technical

personnel.

WARNING - USE

The UPM-DT-50SP is intended for testing only

and should never be used in diagnostics,

treatment or any other capacity where it would

come in contact with a patient.

CAUTION - MODIFICATIONS

The UPM-DT-50SP is intended for use within the

published specifications. Any application

beyond these specifications or any unauthorized

user modifications may result in hazards or

improper operation.

CAUTION - INSPECTION

Inspect the UPM-DT-50SP before each use for

wear. It should be serviced if any parts are in

question.

CAUTION - ENVIRONMENT

Exposure to environmental conditions outside

the specifications can adversely affect the

performance and accuracy of the UPM-DT-50SP.

If the unit is outside the Operating

Specifications, allow it to acclimate to specified

conditions for at least 30 minutes before

attempting to operate it.

iii

CAUTION - CLEANING

Do not immerse. UPM-DT-50SP should be
cleaned by wiping gently with a damp, lint-free
cloth. A mild detergent can be used if desired.

NOTICE – ABBREVIATIONS

C

Celsius

°

degree

DUT

Device Under Test

F

Fahrenheit

g

gram(s)

IEC

International Electrotechnical Commission

kg

kilogram(s)

MHz

Megahertz

mm

millimeter(s)

mW

milliwatt(s)

PPM

Parts Per Million

Lbs

pounds

USA

United States of America

V

Volt(s)

VAC

Volt(s) Alternating Current

VDC

Volt(s) Direct Current

W

Watt(s)

CAUTION - LIQUIDS

Do not submerge or spill liquids on the

UPM-DT-50SP. Do not operate the

UPM-DT-50SP if internal components not intended

for use with fluids may have been exposed to

fluid, as the internal leakage may have caused

corrosion and be a potential hazard.

NOTICE – SYMBOLS

Symbol

Description

Per European Council Directive
2002/95/EC, do not dispose of this
product as unsorted municipal waste.

iv

UPM-DT-50SP User Manual Copyright © 2017

www.ohmicinstruments.com Made in the USA

08/17 Rev 01

NOTICE – DISCLAIMER

OHMIC INSTRUMENTS WILL NOT BE RESPONSIBLE FOR ANY
INJURIES SUSTAINED DUE TO UNAUTHORIZED EQUIPMENT
MODIFICATIONS OR APPLICATION OF EQUIPMENT OUTSIDE
OF THE PUBLISHED INTENDED USE AND SPECIFICATIONS.

NOTICE – DISCLAIMER

OHMIC INSTRUMENTS RESERVES THE RIGHT TO MAKE
CHANGES TO ITS PRODUCTS OR SPECIFICATIONS AT ANY
TIME, WITHOUT NOTICE, IN ORDER TO IMPROVE THE DESIGN
OR PERFORMANCE AND TO SUPPLY THE BEST POSSIBLE
PRODUCT. THE INFORMATION IN THIS MANUAL HAS BEEN
CAREFULLY CHECKED AND IS BELIEVED TO BE ACCURATE.
HOWEVER, NO RESPONSIBILITY IS ASSUMED FOR
INACCURACIES.

NOTICE – CONTACT INFORMATION

OHMIC INSTRUMENTS

3081 ELM POINT INDUSTRIAL DR.

SAINT CHARLES, MO 63301

USA

410-820-5111

www.ohmicinstruments.com

[e-mail]

1

The Model UPM-DT-50SP Ultrasound Power Meter is designed to measure the ultrasonic
power output of diagnostic or therapeutic transducers up to 30 Watts. The principle of
measurement is the radiant force method. The UPM-DT-50SP uses a positioning clamp
to hold the transducer in degassed 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 force 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; Watts of power (custom units) or grams of force. The
choice of units (Watts or grams) is selected by front panel pushbuttons.

INTRODUCTION

2

Water as a Measurement Medium*

Ultrasound propagation in water closely approximates ultrasound propagation in tissue.
Large areas in the body can consist of low attenuating material such as urine and amniotic
fluid. Other areas of the body, such as the liver, contain higher attenuating materials.
Water is used as a lower limit of the attenuation encountered in the body. This allows
measurements to represent the highest possible intensities that might be encountered in
the body. Degassed water is the widely accepted test medium for ultrasound transducers
(see AIUM/NEMA Standards Publication #UL-1-1981, SAFETY STANDARD FOR
DIAGNOSTIC ULTRASOUND EQUIPMENT).

Degassed Water

Ultrasound Power measurement accuracy is affected if the water contains more than
5-10 PPM of air. To degas, boil distilled water for 30 minutes, then seal the container
tightly and place it in a refrigerator. An alternate method of degassing water is to heat the
water to the boiling point, then pull a vacuum on it for five to ten minutes. The degassed
water storage container should be made of glass or plastic. Polystyrene containers should
not be used since they allow oxygen to permeate and degrade the water quality. Any
unsealed degassed water will absorb oxygen and affect measurement accuracy,
therefore a change of degassed water is recommended before each test. Water
temperature also affects accuracy. It is recommended to use an ambient testing
temperature of 24.0 ±3.0 °C (75.2 ±5.4 °F). Sonic energy agitates the water surface
through heating and scattering. Prolonged testing, particularly at higher power levels, will
show visible signs of air bubbles on the transducer, target, and tank lining. Replace the
tank’s degassed water before each test.

TEST SETUP