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Elma BM 251-252-255-257
side 11
modstand, gennemgang, kapacitans, diode test funktioner
Tryk på
SELECT
knappen momentvis for at vælge funktionerne sekvensvist. Det sidst
valgte område vil blive gemt ved eventuel nedbrydningsfejl på instrumentet.
ADVARSEL!
Aflad kondensatorer før der foretages målinger. Kondensatorer med høje
værdier skal aflades igennem en passende modstand.
ADVARSEL!
Ved brug af modstands- og gennemgangsfunktionerne i et
spændingsførende kredsløb kan skabe forkerte resultater og kan i værste fald beskadige
instrumentet. I mange tilfælde må den ”beskyldte” komponent fjernes fra kredsløbet, for at
man kan opnå korrekt målinger.
Gennnemgangsfunktionen er brugbar for kontrol af ledningsforbindelser og funktion af
afbrydere. En kontinuerligt biptone indikerer en komplet ledning/system.
Et normalt forudindtaget spændingsfald for en god diode er mellem 0,4V til 0,9V. En
aflæsning højere end dette indikerer en utæt diode. En nul aflæsning indikerer en
kortsluttet diode.
OL
indikerer en åben diode. Forbind testledningerne omvendt over
dioden. Displayet viser
OL
hvis dioden er god. Alle andre aflæsninger indikerer, at dioden
er umodstandsdygtig eller kortsluttet.
11


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