Gossen MetraWatt SECULIFE UP User manual

Operating Manual
SECULIFE UP
Digital Ultrasound Meter
3-349-978-03
2/10.17

GMC-I Messtechnik GmbH 3
SECULIFE UP

WARNINGS, SAFETY PRECAUTIONS AND NOTES .................................................................. 4
INTRODUCTION ............................................................................................................................ 8
OPERATING INSTRUCTIONS ...................................................................................................... 9
LAYOUT ........................................................................................................................................ 11
OPERATING PROCEDURE ........................................................................................................ 12
GENERAL OPERATING NOTES ................................................................................................. 14
CALIBRATION .............................................................................................................................. 15
THEORY ....................................................................................................................................... 16
MAINTENANCE ............................................................................................................................ 18
MANUAL REVISIONS .................................................................................................................. 19
LIMITED WARRANTY .................................................................................................................. 19
SPECIFICATIONS ......................................................................................................................... 20
SERVICE ...................................................................................................................................... 21
GOSSEN METRAWATT
SECULIFE UP ULTRASOUND WATTMETER
TABLE OF CONTENTS

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4 GMC-I Messtechnik GmbH
WARNING - USERS
The SECULIFE UP is for use by
skilled technical personnel only.
WARNING - USE
The SECULIFE UP 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 SECULIFE UP 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 - SERVICE
The SECULIFE UP is intended to be serviced
only by authorized service personnel.
Troubleshooting and service procedures should
only be performed by qualified technical
CAUTION - ENVIRONMENT
Exposure to environmental conditions outside
the specifications can adversely affect the
performance and accuracy of the SECULIFE UP.
If the unit is outside the Operating
Specifications, allow it to acclimate to specified
conditions for at least 30 minutes before
CAUTION - INSPECTION
Inspect the SECULIFE UP before each use for
wear. It should be serviced if any parts are in
question.

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CAUTION - LIQUIDS
Do not submerge or spill liquids on the SECULIFE
UP. Do not operate the SECULIFE UP 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.
CAUTION - CLEANING
Do not immerse. The SECULIFE UP should be
cleaned by wiping gently with a damp, lint-free
cloth. A mild detergent can be used if desired.
NOTICE – SYMBOLS
Symbol Description
Center Negative
Per European Council Directive
2002/95/EC, do not dispose of this
product as unsorted municipal waste.
NOTICE – ABBREVIATIONS
C
°
DUT
F
g
IEC
kg
MHz
mm
mW
PPM
Lbs
USA
V
V
AC
VDC
W
Celsius
degree
Device Under Test
Fahrenheit
gram(s)
International Electrotechnical Commission
kilogram(s)
Megahertz
millimeter(s)
milliwatt(s)
Parts Per Million
pounds
United States of America
Volt(s)
Volt(s) Alternating Current
Volt(s) Direct Current
Watt
(
s
)

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NOTICE – DISCLAIMER
GMC-I MESSTECHNIK GMBH 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
GMC-I MESSTECHNIK GMBH 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
GMC-I Messtechnik GmbH
Südwestpark 15
90449 Nürnberg
Germany
Phone: [phone]
Fax: [phone]
www.gossenmetrawatt.com
e-mail: [email protected]

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SECULIFE UP

SECULIFE UP
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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 Power Meter, Model SECULIFE UP, 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 SECULIFE UP uses a positioning clamp with two
locking ball joints 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 weight is then transferred through the target support assembly to the electro-mechanical
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 ‘C” on the display or grams of force “G” on the
display. The choice of units (grams or watts) is selected by a front panel push button. The
SECULIFE UP is supplied with a plug-in 120 VAC to 12VDC 500 mA adapter (using another
adapter not rated or wired the same may damage unit). Unit can be operated off 4 AA batteries
for over 40 hours. The SECULIFE UP has a display resolution of ± 50 milliwatt.
INTRODUCTION

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Water as a Measurement Medium*
The measurements are to be performed in water because ultrasound propagation in water
closely approximates that in tissues. The ultrasonic attenuation in water can be taken as a lower
limit on the attenuation that will be encountered in the body. Large areas in the body can consist
of low attenuating material such as urine and amniotic fluid. The use of water prevents
measurements in a more highly attenuating material, such as liver equivalent gels, from
representing the highest possible intensities that might be encountered in the body.
* Ultrasound propagation in water closely approximates human tissue and degassed water is
the generally accepted test medium for ultrasound transducers.
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. Before testing, pour water into tilted test tank with
minimum amount of turbulence. The test tank water surface will absorb oxygen, therefore a
change of degassed water is recommended before each test. Water temperature affects
accuracy, so 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
The time duration of each test should be limited to a few minutes. Prolonged testing, particularly
at higher power levels, will show visible signs of air bubbles on the transducer, target, and the
absorbing rubber surface.
OPERATING INSTRUCTIONS

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Transducer Wetting and Placement
To avoid introducing air into the degassed water, insert the transducer at a 45° angle, then
position so it is facing the target. Verify that the transducer surface is uniformly wetted, if not,
wipe the surface clean using your finger. The transducer should be pointed toward and center-
positioned directly above the cone target. Small measurement variations will occur due to
placement of the transducer. Try various positions above the target to minimize the magnitude
of error due to positioning.
Selecting a Location for Operation
The SECULIFE UP should always be used in an environment free from excessive air currents,
corrosives, vibration and temperature or humidity extremes. These factors will affect the
displayed readings.
DO NOT operate the SECULIFE UP
 Next to open windows or doors causing drafts or rapid temperature changes!!!
 Near air conditioning or heat ducts!!!
 Near vibrating, rotating or reciprocating equipment!!!
 Near magnetic fields or equipment that generates magnetic fields!!!
 On an unleveled work surface!!!
Allow sufficient space around the instrument for ease of operation and keep away from radiant
heat sources. Never set any material on the SECULIFE UP or place your hands or fingers on it
while taking reading.

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1. On/Zero – Off - Button: Press to turn unit on or zero, press and hold until OFF is displayed
then release to turn off.
2. Print Unit: Press to print, press and hold then release when desired unit is displayed.
“g” = grams
“c” = custom = Watts
3. Display: 7 Segment, 6 digit display: Displays readings.
4. Stability Indicator: Displays once the scale is stabilized and ready to take a measurement.
5. Test tank: Must be filled with degassed water
6. Transducer clamp: Holds the ultrasonic transducer over the test tank
7. Precision weight: Used for testing the calibration
LAYOUT

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1. Place the SECULIFE UP on a stable and level surface. Avoid air currents and
mechanical vibrations. Level the unit.
2. Loosen the transducer positioning clamp and move it out of the way. Position the
tank on the rubber circle.
3. Fill the test tank to ¼ inch (6.4 mm) below the top of the tank liner with fresh
degassed water at a temperature of 24.0 ±3.0 °C (75.2 ±5.4 °F).
4. Plug the AC Adapter into a 120 VAC, 60 Hz power outlet and plug the cord into the
power jack at the rear of the unit (unless operating from battery power).
5. Lower the cone target into the concentric target support sleeve located behind the
test tank (small tube inside of larger tube), while simultaneously placing the cone
target into the tank. If the cone can swing in an arc, it is not down far enough. Tip
the rod back and forth slightly to fully engage the rod. Press the ON/Zero - Off
button to zero the unit.
6. To avoid introducing air into the degassed water, insert the transducer at a 45°
angle. Then position so it is facing the target ⅛ to ¼ inch (3.2 to 6.4 mm) below the
water level, parallel to the water surface, and directly above the center of the cone.
Check the transducer surface for uniform wetting (no air pocket or bubbles should
be on its surface).
7. Allow 5 minutes for the scale to stabilize. With no ultrasonic power applied to the
transducer, press the ON/Zero - Off button to zero the unit.
8. Check response by placing the 1 gram weight on the arm of the cone target (the
flat part that is out of the water). The SECULIFE UP should read 1.00 ± 0.10
grams. Change the units to the watts (Custom) mode by pressing and holding the
Print Unit button until “C” is displayed, the release. The unit should read 14.65
watts ± 0.2 watts. 1 gram is equal to 14.65 watts.
9. Remove the 1 gram weight. Press the ON/Zero - Off button to zero the unit.
OPERATING PROCEDURE

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10. After the display’s stability indicator is shown, activate the DUT and record the
measurement. Rezero before each measurement and take your power reading
when the display has stabilized. It is a good practice to take three readings and
average them. If measurement conditions are not stable, use the grams mode and
multiply the readings by 14.65 to obtain Watts.
11. Determine the maximum peak power with the maximum duty cycle and pulsed
output settings with the equation:
PAVE = Pp / Rtpa
PAVE = calculated average power
Pp = Peak Pulsed Power Setting on unit under test
Rtpa = Ratio of Temporal Peak to Average Power (from each manufacturer)
12. To calculate the watts/cm² output, take the total watts reading from the unit and
divide by the area. The area is π D2 ÷ 4 (D is the diameter of the transducer) if the
transducer is smaller than the cone. Otherwise, use (8.2 cm) the cone’s diameter
as the area.
13. When finished, turn the unit off by pressing and holding ON/Zero/Off button until
OFF is displayed, then re-lease. Unplug the SECULIFE UP, empty the tank and
dry. Dry target cone. Place in foam in case along with power adapter. Position
transducer holder over tank. Position transducer holder over tank positioner. Close
case and latches.

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Line / Battery Power: The SECULIFE UP is supplied with a 120 VAC 60 Hz adapter. Check for
correct line voltage before use.
1. Slowly fill tank with degassed water. Press the On/ Zero/Off button to turn unit on.
Select Watts (C) or Grams (G) by pressing and holding the Print/Unit but-ton.
Release the button when unit needed is displayed. Press the On/Zero/Off button
to zero unit. Place cone target assembly into test tank and in the small tube in-side
of the large tube. Press the On/Zero/Off button to zero the unit.
2. Place ultrasound transducer 1/8 inch into water above the center of the cone target
using the clamp assembly.
3. Place the standard 1 gram test weight on the flat part of the cone target assembly.
It should read (1.000) grams or 14.65 watts.
4. Zero the unit and take the power reading. Repeat as required.
5. To turn unit OFF press and hold On/Zero/Off until OFF is displayed, then release.
Battery operation optional. To Install Batteries:
Hold unit upside down. Be careful not to allow unit to rest on target support sleeve!
Remove battery compartment cover and install 4 AA alkaline batteries, observing orientation
marks. Replace the battery compartment cover.
Be careful not to damage the target support sleeve.
GENERAL OPERATING NOTES

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Critical programming such as calibration and Custom mode parameters are locked in and
cannot be changed by the user. If reprogramming to the original parameters does become
necessary, the unit must be returned to GMC’s facility in Germany, Nuremberg. An hourly labor
rate will be charged for any necessary repairs and recalibration fees will be assessed. A
calibration certificate will be returned with the unit.
Checking Calibration
A 1-gram weight is supplied to check the calibration and programming. With the transducer
under test turned off, zero the unit. Place the weight on the arm of the cone target. Within 3
seconds the unit should read 14.65 watts (± .2 watts) or 1.000grams (± .01 grams). If this
reading is significantly off, the SECULIFE UP needs to be recalibrated. Send it to GMC
Instruments Co. for calibration. It is recommended that the SECULIFE UP be returned to GMC
on a yearly basis for calibration and certification.
CALIBRATION

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Theory of Measuring Ultrasound Power with The Radiation Force Method
Ultrasound is a form of energy that sets the particles in the isonated medium into vibrational
motion. The particles then possess a kinetic energy. If d*Pm is the rate of the flow of this energy
about an area d*A, then the mean acoustic energy is:
Eq. 1 I = d*Pm/d*A
I = Acoustic intensity at a point in that area, Watts/cm2
When a plane sound wave propagates through a uniform non-absorbent medium, the intensity
must be the same for all points in the wave. Let E represent the energy density, i.e., the energy
per unit volume. When the sound energy passes through a unit cross-sectional area with a
speed c, the intensity is:
Eq. 2 I = c*E
E = Energy density per unit volume, ergs/cm3
c = Ultrasound wave velocity, cm/sec
The radiation pressure effect can be explained by analogy to the application of an alternating
electric voltage to a non-linear load. With the non-linear load it appears that both AC and DC
components are present. In ultrasonics the non-linear element is the density of the fluid and
hence acoustic impedance (load) varies in the same periodical manner as the density.
Therefore in ultrasound the two components of pressure, one alternating and the other direct
are present. The average AC pressure per cycle is zero, but the DC pressure of radiation is:
THEO
R
Y

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Eq. 3 P* = I/C
P = Pressure of Radiation, ergs/cm3
Therefore, from the above two equations, the pressure of radiation (P) is equal to the energy
density (E).
Eq. 4 P* = E
It is this DC pressure of radiation that can be measured. At low frequencies, below 100 KHz, a
standard high frequency hydrophone can be used. For higher frequencies, generally used in
medical applications, 1-15 MHz, hydro-phones are not available. At these frequencies the force
can be measured using a precision balance and a radiation force target that is perfectly
absorptive. The conversion from force to power can be accomplished using the equation:
Eq. 5 p = W*g*c
W = measured force, grams
g = acceleration, dynes
c = velocity of ultrasound, cm/sec p = power, ergs/sec
By combining all constants together and converting from ergs/sec to watts, we obtain a
simplified equation that is used to calculate the ultrasonic power once the force is measured:
P = w (14.65)
P = Ultrasonic power in watts
w = Ultrasonic force in grams
To determine the ultrasonic watt density (watts/cm2 or watts/in2) of a given transducer the P is
divided by the cross sectional area of the transducer.

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Verification of Proper Scale Functioning: Small variations of water surface motion, air currents
or mechanical movements may cause uncertainties in power measurements.
To test scale accuracy at low levels, set up the scale as in the Operating Procedure (Pages 12
& 13). Place the 14.65 watt weight on the flat surface of the target arm. Read meter three
times; readings should be within ± .05 counts (for example, 14.60 to 14.70). In case of doubt
about lower power resolution, repeat the same procedure using light objects such as thin paper
slices to produce readings of 5 to 10 counts; repeat readings. Average uncertainty should be
within ± .05 counts on the watts scale. Avoid mechanical and air movement or variations in
magnetic fields while making tests.
Out of Measurement Range Warnings: Model SECULIFE UP accommodates weight differential
of ± 120 grams. When the scale exceeds this range, “Err 2” will be dis-played. Something may
be pressing hard on the target or support. “Err 2” also indicates underweight condition. If no
obvious error has been made by the user the unit should be returned for service when any
code is displayed.
No Display: 1) Make sure the AC adapter’s plug is fully seated in the jack at the back of the
unit. 2) Use a voltmeter to verify the adapter is producing 12 volts DC (approximately). Call our
service department for assistance.
MAINTENANCE

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Revision # Revisions Made
Rev 01 Origination
Rev 02 Miscellaneous Edits and Additions, Pictures Updated
WARRANTY: GMC-I MESSTECHNIK GMBH WARRANTS ITS NEW PRODUCTS TO BE FREE FROM
DEFECTS IN MATERIALS AND WORKMANSHIP UNDER THE SERVICE FOR WHICH THEY ARE INTENDED.
THIS WARRANTY IS EFFECTIVE FOR TWELVE MONTHS FROM THE DATE OF SHIPMENT.
EXCLUSIONS: THIS WARRANTY IS IN LIEU OF ANY OTHER WARRANTY EXPRESSED OR IMPLIED,
INCLUDING, BUT NOT LIMITED TO ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE.
GMC-I MESSTECHNIK GMBH IS NOT LIABLE FOR ANY INCIDENTAL OR CONSEQUENTIAL DAMAGES.
NO PERSON OTHER THAN AN OFFICER IS AUTHORIZED TO GIVE ANY OTHER WARRANTY OR ASSUME
ANY LIABILITY.
REMEDIES: THE PURCHASER'S SOLE AND EXCLUSIVE REMEDY SHALL BE: (1) THE REPAIR OR
REPLACEMENT OF DEFECTIVE PARTS OR PRODUCTS, WITHOUT CHARGE. (2) AT THE OPTION OF
GMC-I MESSTECHNIK GMBH, THE REFUND OF THE PURCHASE PRICE.
MANUAL REVISIONS
LIMITED WARRANTY

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20 GMC-I Messtechnik GmbH
ULTRASONIC POWER MEASUREMENT
POWER RANGE 0 to 30 W
RESOLUTION ± 50 mW
MINIMUM DETECTABLE
POWER LEVEL 50 mW
ACCURACY ± 3 % + One Count Reading
DIGITAL FILTER 2.5 seconds Integration
DUT OPERATING
FREQUENCY 0.5 to 10 MHz
DUT MAXIMUM
TRANSDUCER SIZE 101.6 mm
TEST MEDIUM Degassed Water @ 24.0 ±3.0 °C
ELECTRICAL
BATTERY Quantity 4, AA (IEC LR6) Alkaline
BATTERY ELIMINATOR
12 V AC, 500 mA
20-40337 (USA)
20-40341 (EURO)
PHYSICAL & ENVIRONMENTAL
DISPLAY 6-digit, Backlit LCD
CONSTRUCTION TANK LINING 12.7 mm thick Neoprene
CARRYING CASE Molded Polyethylene
SIZE OVERALL (Including case):
431.8 x 330.2 x 152.4 mm
WEIGHT OVERALL (Including case):
< 4.5 kg
OPERATING RANGE 15 to 30 °C
STORAGE RANGE -40 to 60 °C
SPECIFICATIONS