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9-4 OutputPowerofMagnetron
Theoutputpowerofthemagnetroncanbemeasuredbyperformingawatertemperaturerisetest.
Equipmentneeded:
*Two1-litercylindricalborosilicateglassvessel(Outsidediameter190mm)
*Oneglassthermometerwithmercurycolumn
NOTE:Checklinevoltageunderload.Lowvoltagewilllowerthemagnetronoutput.Makealltemperature
andtimetestswithaccurateequipment.
1.Filltheoneliterglassvesselwithwater.
2.Stirwateringlassvesselwiththermometer,andrecordglassvessel'stemperature("T1",10±1°C).
3.Aftermovingthewaterintoanotherglassvessel,placeitinthecenterofthecookingtray.Settheovento
highpowerandoperatefor49secondsexactly.(3secondsincludedasaholdingtimeofmagnetron
oscillation:)
4.Whenheatingisfinished,stirthewateragainwiththethermometerandmeasurethetemperature("T2").
5.SubtractT1fromT2.Thiswillgiveyouthewatertemperaturerise.(T)
6.Theoutputpowerisobtainedbythefollowingformula;
OutputPower= 4.187x1000x T+0.55xMcx(T
2
-T
0
) 49:HeatingTime(sec)
46 46:CountingTime(sec)
4.187:CoefficientforWater
1000:Water(cc)
T:TemperatureRise(T1-T2)
To:RoomTemperature
Mc:Cylindricalborosilicateglassweight
7.Normaltemperatureriseforthismodelis9°Cto11°Cat'HIGH'.
NOTE1:Variationsorerrorsinthetestprocedurewillcauseavarianceinthetemperaturerise.
Additionalpowertestshouldbemadeiftemperatureriseismarginal.
NOTE2:Outputpowerinwattsiscomputedbymultiplyingthetemperaturerise(step5)byafactorof91
timestheofcentigradetemperature.
9-5 MicrowaveHeatDistribution-HeatEvenness
Themicrowaveheatdistributioncanbecheckedindirectlybymeasuringthewatertemperatureriseat
certainpositionsintheoven:
1.Preparefivebeakersmadeof'Pyrex',having100milliliterscapacityeach.
2.Measureexactly100millilitersoffwaterloadwithameasuringcylinder,andpourintoeachbeaker.
3.Measurethetemperatureofeachwaterload.(Readingsshallbetakentothefirstplaceofdecimals.)
4.Puteachbeakerinplaceonthecookingtrayasillustratedinfigurebelow.Startheating.
5.Afterheatingfor2minutes,measurethewatertemperatureineachbeaker.
6.Microwaveheatdistributionratecanbecalculatedasfollows:
Minimum
HeatDistribution= TemperatureRise X100(%)
Maximum
TemperatureRise
Theresultshouldexceed65%.
CAUTION
MICROWAVERADIATION
PERSONNELSHOULDNOTALLOWEXPOSURETOMICROWAVERADIATIONFROMMICROWAVE
GENERATOROROTHERPARTSCONDUCTINGMICROWAVEENERGY.
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