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Voltcraft VC-890 Manual

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102
Pour mesurer les courants alternatifs (A
), veuillez procédez comme décrit préalablement :
1. Allumez le DMM et sélectionnez la plage de mesure « A
», « mA » ou « A ».
2. Appuyez sur la touche SHIFT/SETUP (3) pour commuter dans la plage AC. L’écran affi che «
»,
«
» ou « ». Chaque nouvelle pression vous fait revenir à la plage précédente.
3. À la fi n de la mesure, retirez les cordons de mesure de l’objet à mesurer et éteignez le DMM.
Ne mesurez en aucun cas les courants supérieurs à 10 A dans la plage 10A, ou les
courants de plus de 600 mA dans la plage µA/mA, sous risque de déclencher les
fusibles.
d) Mesure de la fréquence / rapport signal en % (Duty Cycle)
Le DDM peut mesurer et affi cher la fréquence d’une tension de signal de 10 Hz - 60 MHz.
Procédez comme suit pour mesurer les fréquences :
1. Allumez le DMM et sélectionnez la plage de mesure
« mV Hz % ». Appuyez sur la touche SHIFT/SETUP (3)
jusqu’à ce que l’écran affi che « Hz ».
2. Insérez le cordon de mesure rouge dans la douille de mesure
°CHzV (7), le cordon de mesure noir dans la douille de
mesure COM (8) (Fig. 4).
3. Raccordez les deux pointes de mesure à l’objet à mesurer
(générateur de signal, circuit, etc.).
4. La fréquence s’affi che à l’écran avec l’unité correspondante.
5. Pour mesurer le rapport signal (Duty Cycle), appuyez une
nouvelle fois sur la touche SHIFT/SETUP jusqu’à ce que
« % » s’affi che.
6. À la fi n de la mesure, retirez les cordons de mesure de l’objet
à mesurer et éteignez le DMM.
Fig. 4
e) Mesure de la résistance
Assurez-vous que tous les éléments de circuit, les circuits et les composants à
mesurer, ainsi que les autres objets de mesure sont bien hors tension.
71
10. To continue recording, hold down the REL/PC (Log/) button again for approx. 2 s.
11. To exit the SHIFT mode, press the SHIFT/SETUP button.
Settings for the data memory:
1. Make the settings for the data memory in the SETUP menu.
2. With the measuring device switched on, hold down the SHIFT/SETUP button (3) for approx. 2 s.
will appear on the display. You are now in SHIFT mode.
3. Hold down the SHIFT/SETUP button again for approx. 2 sec to open the SETUP menu.
4. Now press the SHIFT/SETUP button several times until the menu item “LOGGER MEMORY” is
selected. An asterisk symbol * to the left of the menu item shows that the menu item is selected.
5. Press the REL/PC (Log/) or MAX/MIN (View/) button to select “FIX” or “OVERWRITE”.
6. The setting “FIX” means that the measured values will be stored until the memory is full (max. 1000
measured values). The measurement will be stopped at the memory number “1000”.
7. The setting “OVERWRITE” means that the measured values will be continually stored. If the
measured value “1000” is reached, the device will begin to overwrite the measured values. The
memory number will no longer be displayed. Instead, a blinking infi nity symbol “” will appear.
8. The menu item “LOGGER MEMORY” is preset to “FIX” by default.
9. Hold down the SHIFT/SETUP button for approx. 2 sec to save the setting and exit the SETUP
menu. You will also exit SHIFT mode.
Display setting for automatic measured value recording:
1. In the automatic measurement, it is possible to activate the energy saving mode.
2. Make these settings in the SETUP menu.
3. With the measuring device switched on, hold down the SHIFT/SETUP button (3) for approx. 2 s.
will appear on the display. You are now in SHIFT mode.
4. Hold down the SHIFT/SETUP button again for approx. 2 sec to open the SETUP menu.
5. Now press the SHIFT/SETUP button several times until the menu item “LOGGER DATA DISPLAY”
is selected. An asterisk symbol * to the left of the menu item shows that the menu item is selected.
6. Press the REL/PC (Log/) or MAX/MIN (View/) button to select “ON” or “OFF”.
7. The “ON” setting means that the display will always be switched on during the automatic
continuous measurement.
… 69 …


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