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7.4 Diode
7.5 Microgolfdichtheidstest
Deze test dient na alle onderhoudswerkzaamheden aan deur, sluitsysteem, microschakelaars en magnetron
te worden uitgevoerd.
Testuitrusting
600 ml glas
microgolftestapparaat
Testmethode
250 ml water in het glas vullen en dit vervolgens in het midden van de magnetronoven plaatsen.
De magnetronoven inschakelen. Hiervoor maximaal vermogen op 5 minuten instellen.
De testsonde van het microgolftestapparaat verticaal boven de deurrand van de magnetronoven houden en
deze zeer langzaam aftasten.
De volgende elementen moeten op microgolfdichtheid worden gecontroleerd:
deur en bedieningspaneel
alle ventilatiespleten
alle felsen
lasnaad aan de onderkant
bodemplaat
Methode:
Open de deur zover dat de magnetron net niet wordt uitgeschakeld.
De afstand tussen deur en sonde mag niet minder dan 5 cm bedragen.
De maximaal toelaatbare lekstraling bedraagt 4 mW / cm².
Controle van de diode: Normaal resultaat:
Tussen de aansluitingen een stroomkring met 12 V ge-
lijkstroom en een 2,5 V-lamp opbouwen.
De lamp is ofwel aan of uit, naargelang
van de stroomrichting.
Defecte diode:
Lamp brandt te fel: kortsluiting
Lamp is nooit aan: open stroomkring
23


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