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Voltcraft VC-890 Manual

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18. RECORDING AND MANAGING MEASURED VALUES
With its data logging function, the VC890 digital multimeter makes it possible to record up to 1000
measured values.
Proceed as follows to manually save measured values:
1. 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.
2. Now press the REL/PC (Log/) button (10c) to save the currently measured value.
will
appear on the display and below that the fi rst memory number “0001”.
3. To record another value, press the REL/PC (Log/) button again. The second memory number
“0002” is displayed.
4. To exit SHIFT mode, press the SHIFT/SETUP button.
If you have not stored any values for approx. 3 seconds, the symbol and the memory
number will go out. Press the REL/PC (Log/) button again to save more values.
and
the memory number will appear on the display.
Saving measured values automatically:
1. First select the desired recording rate in the SETUP menu. The default setting of the device
records one measured value per second.
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 SAMPLING
RATE” is selected. An asterisk symbol * to the left of the menu item shows that the menu item
is selected.
5. Press the H/LIGHT (+/COMP) or RANGE (-) button to set the recording rate (setting range: 1 to
10 seconds).
6. Hold down the SHIFT/SETUP button (3) for approx. 2 sec to save the setting and exit the SETUP
menu. You will also exit SHIFT mode.
7. To record measured values, you must switch to the SHIFT mode. With the measuring device
switched on, hold down the SHIFT/SETUP button (3) for approx. 2 sec until
appears on
the display.
8. Hold down the REL/PC (Log/) button for approx. 2 sec to start the automatic recording.
will appear on the display with the memory number below it. The device will now save the
measured values at the recording rate you have set.
9. To stop recording, hold down the REL/PC (Log/) button again for approx. 2 s.
103
Pour mesurer la résistance, procédez comme suit :
1. Allumez le DMM et sélectionnez la plage de mesure « ».
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. 5).
3. Assurez-vous de la continuité des cordons de mesure en
reliant leurs deux pointes de mesure. Une valeur de résistance
d’env. 0 1,5 ohms devra s’affi cher (résistance inhérente des
cordons de mesure).
4. Pour des mesures à basse impédance, appuyez sur la touche
REL/PC (Log/) (10c) pour ne pas introduire la résistance
inhérente des cordons de mesure dans la mesure de la
résistance suivante. L’écran affi che le symbole delta
et
indique 0 . La sélection de plage automatique (AUTO) est
désactivée. La valeur de base (différence relative) apparaît à
côté du symbole delta
.
Fig. 5
5. Reliez maintenant les deux pointes de mesure à l’objet à mesurer. La valeur de mesure s’affi che à
l’écran à condition que l’objet à mesurer n’ait pas une haute impédance ou ne soit pas interrompu.
Attendez que la valeur affi chée se soit stabilisée. Pour des résistances >1 M, cela peut durer
quelques secondes.
6. Dès que « OL » (pour overload = dépassement) apparaît à l´écran, cet affi chage indique que vous
avez dépassé la plage de mesure ou que le circuit de mesure est interrompu. En appuyant une
nouvelle fois sur la touche REL/PC (Log/), la fonction Relativ s’éteint et la fonction Autorange
s’active.
7. À la fi n de la mesure, retirez les cordons de mesure de l’objet à mesurer et éteignez le DMM.
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 soudable ou autres
produits similaires. Ce genre de circonstances peut en effet fausser le résultat de la mesure.
f) Test de diodes
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.
… 68 …


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