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j) Mesure de capacité
Assurez-vous que tous les éléments du circuit, circuits et composants à mesurer ainsi que les
autres composants à mesurer sont impérativement hors tension et déchargés.
Respectez impérativement la polarité des condensateurs électrolytiques.
- Mettez le DMM sous tension puis sélectionnez la fonction
de mesure « Capacité »
- Enchez la ligne de mesure rouge dans la douille de me-
sure Ω (E) et la ligne de mesure noire dans la douille de
mesure COM (D).
Lorsque les lignes de mesure ne sont pas pro-
tégées, il peut arriver qu’une valeur s’afche sur
l’écran en raison de la sensibilité de l’entrée de
mesure. L´afchage se met à « 0 » en appuyant
sur la touche « REL ». La fonction Autorange
reste activée.
- Reliez les deux pointes de mesure (rouge = pôle positif/
noire = pôle négatif) à l’objet à mesurer (condensateur).
La capacité s’afche en l’espace de quelques secondes
sur l’écran. Attendez que la valeur afchée se stabilise.
Avec les capacités > 40 µF, cela peut durer quelques
minutes.
- Si l’indication « OL » (pour Overload = dépassement) s’af-
che sur l’écran, vous avez dépassé la plage de mesure.
- Après la mesure, retirez les lignes de mesure du compo-
sant à mesurer puis éteignez le DMM.
18


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