Instrumentation électronique

Instrumentation,électronique,
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Variation de
l’amplitude
de sortie
On/Off
Forme du
signal généré
Variation de la grandeur
sélectionnée proportionnelle à la
vitesse de rotation de l'encodeur.
Variation de
la tension
continue
Variation de
la fréquence
Variation des
gammes de
fréquences
Sortie
principale sur
prise BNC
Sortie TTL
%
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Expérience*:*Générer*et*visualiser*à*l’oscilloscope*(utilisée*pour*cette*expérience*en*mode*AUTO)*:*
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Préparation*:*Exprimer*la*tension*𝑢!*aux*bornes*de*la*résistance*𝑅*en*fonction*de*𝑅,*de*la*résistance*
interne*du*GBF*et*de*la*tension*à*vide.*En*déduire*l’expression*de*𝑅!!en*fonction*de*R,*e*et*𝑢!.*

,TP,E1,:,Instrumentation,électronique,,,,,,,,,,,,,,,,3,
Expérience*:*Régler*le*GBF*pour*qu’il*délivre*une*tension*continue*dont*le*niveau*est*réglable*à*l’aide*du*
bouton*décalage*(OFFSET).*
Relier*l’entrée*du*multimètre*directement*à*la*sortie*du*GBF*et*mesurer*la*valeur*de*la*tension*à*vide*e.*
Puis*sans*toucher*aux*réglages*du*GBF,*réaliser*le*circuit*de*droite*avec*une*résistance*R*de*l’ordre*de*
50*Ω.**Mesurer*la*valeur*de*la*tension*𝑢!*aux*bornes*de*R.*
En*déduire*une*mesure*de*la*résistance*interne*𝑅!*du*GBF.**
On*caractérisera*les*incertitudes*de*mesure*à*l’aide*de*la*notice*technique*du*multimètre.*
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Bouton
multifonctionnel
Menu de mesures
automatiques
Boutons réglages
voie sélectionnée
Acquisition des
mesures
Déclenchement de
la base de temps
Choix du signal a
afficher
Entrées
Réglages écran
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