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Voltcraft VC-890 Manual

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1. Allumez le DMM et sélectionnez la plage de mesure « ».
Appuyez sur la touche SHIFT/SETUP (3) jusqu’à ce que le
symbole du test de diodes
s’affi che à l’écran.
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. 6).
3. Assurez-vous de la continuité des cordons de mesure en
reliant leurs deux pointes de mesure. Une valeur d’env.
0,0000 V devra ensuite s’affi cher.
4. Reliez les deux pointes de mesure à l’objet à mesurer (diode).
5. La tension de conduction « UF » s’affi che à l’écran en
volts (V). Si « .OL » est visible, la diode est soit mesurée
en direction inverse (UR) soit défectueuse (interruption). En
guise de contrôle, effectuez une mesure antipolaire.
Fig. 6
6. À la fi n de la mesure, retirez les cordons de mesure de l’objet à mesurer et éteignez le DMM.
g) Contrôle de continuité
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.
1. Allumez le DMM et sélectionnez la plage de mesure « ».
Appuyez sur la touche SHIFT/SETUP (3) jusqu’à ce que le
symbole du test de diodes
s’affi che à l’écran.
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. 7).
3. Une valeur de mesure <10 ohms est détectée comme étant
une valeur de continuité, un signal sonore retentit.
4. L’affi chage « OL. » (pour overload = dépassement) à l’écran
indique que vous avez dépassé la plage de mesure ou que le
circuit de mesure est interrompu.
5. À la fi n de la mesure, retirez les cordons de mesure de l’objet
à mesurer et éteignez le DMM.
Fig. 7
69
7. Once the setting has been made, press the SHIFT/SETUP button again to set the lower limit for the
comparison mode (menu item “COMP MIN”). Here, too, you can now select the individual decimal
places using the REL/PC (Log/) and MAX/MIN (View/) buttons and change their values with
the H/LIGHT (+/COMP) or RANGE (-) button.
The limit settings do not have any units. The actual value of the limit results from the range set
in the measurement.
Example:
You have set the lower limit as “00900” and the upper limit as “01000” in the SETUP menu. In
a comparison measurement in the “mV
” measuring range, the values will be displayed as
follows: “009.00 mV” (lower limit); “010.00 mV” (upper limit)
8. Now press the SHIFT/SETUP button to set the measurement status (menu item “COMP TYPE”).
9. Press the REL/PC (Log/) or MAX/MIN (View/) buttons to select “OUTER” or “INNER”. When
“OUTER” is selected, the measured value is identifi ed as passed (PASS) if it is outside the upper
and lower limits; when “INNER” is selected, the measured value is identifi ed as passed (PASS) if
it is within the upper and lower limits.
10. Hold down the SHIFT/SETUP button (3) for approx. 2 sec to save the settings and exit the SETUP
menu. You will also exit SHIFT mode.
Performing a comparison measurement:
1. Select the measuring range.
2. Hold down the SHIFT/SETUP button (3) for approx. 2 s.
will appear on the display. You
are now in SHIFT mode.
3. Now press the H/LIGHT (+/COMP) button (10a). The symbol
and the preset limits will
appear on the display.
The automatic measuring range selection is deactivated. Before beginning the
measurement, make sure that you have set the correct measuring range. You can
select this using the RANGE (-) button.
4. Connect the two test prods with the object to be measured.
5. The measured value is displayed with the appropriate units.
6. Depending on the previous setting the display will indicate if the currently measured value is within
or outside of the preset limits with the symbols
(pass) and (did not pass).
7. Press the H/LIGHT (+/COMP) button (10a) again to end the comparison mode.
… 67 …


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