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c) Mesure de résistance
ƽ
Assurez-vous que tous les éléments de circuit, tous
les circuits et composants à mesurer, ainsi que
d´autres objets de mesure sont impérativement hors
tension.
Pour la mesure de résistance, procéder comme suit :
• Allumez le DMM par le commu-
tateur rotatif (1) et choisissez la
plage de mesure .
• S’assurer de la continuité des lig-
nes de mesure en reliant ensem-
ble les deux pointes de la sonde.
Une valeur de résistance d’env.
0,5 ohm devra donc ensuite s’af-
ficher.
• Relier maintenant les deux poin-
tes de la sonde à l’objet à mesu-
rer. La valeur de mesure s’affiche
à l’écran (4) à condition que l’ob-
jet à mesurer n’ait pas une haute impédance ou ne soit pas inter-
rompu.
• L’affichage de « O.L.» (pour overflow = dépassement) sur l’écran
indique que vous avez dépassé la plage de mesure ou que le cir-
cuit de mesure est interrompu.
Lorsque vous effectuez une mesure de résistance, veillez à
ce que les points de mesure que vous touchez avec les
pointes soient exempts de saleté, de graisse, de vernis sou-
dable ou autres produits similaires. Ce genre de circon-
stances peut fausser le résultat de la mesure.
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