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w_hint=<table><tr> <td><img src="$val52" name="ecran2"></td> <td align="center"><u>Pour la mesure de la priode:</u><br> Pour avoir la meilleure prcision,il est <b><i>fortement conseill</i></b> de mesurer la priode en utilisant les intersections de la courbe avec l'axe horizontal (voir graphe ci-contre). <br>De plus, utilisez le bouton de la base de temps pour avoir le nombre de priodes le plus <b><i>petit</i></b>  l'cran.<br><p>Si le signal apparat de manire incomplte, dform, ou confondu avec l'axe horizontal changez la base de temps.<br> <font color=red>ATTENTION:</font>aux signaux "trompeurs". Il faut toujours tourner le bouton base de temps pour tre certain de bien lire le signal. </td> </tr></table> 
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