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Voltcraft VC-890 Manual

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66
j) AC voltage measurement with 1 kHz low-pass fi lter
Never use the low-pass fi lter option to test for the presence of dangerous voltages!
The voltages present could be higher than indicated under some circumstances.
Always measure voltage without the fi lter fi rst to identify any dangerous voltages.
The DMM is equipped with an alternating current low-pass fi lter. This is an alternating current
measurement which is led through a low-pass fi lter in order to block unwanted voltages above 1 kHz.
Proceed as follows for AC voltage measurement with the
low-pass fi lter:
1. Turn on the DMM and select the measurement range
“ V
”. Press the SHIFT/SETUP button (3) to switch to the
measurement range “
”.
2. Insert the red test lead in the °CHzV measuring socket (7),
the black test lead in the COM measuring socket (8) (Fig. 10).
3. Connect the two test prods with the object to be measured
(generator, circuit, etc.). The measuring value is indicated on
the display.
4. After the measurement has been completed, remove the test
leads and turn the DMM off.
Fig. 10
12. RANGE FUNCTION, MANUAL MEASURING RANGE
SELECTION
The RANGE function allows the manual selection of the measuring range in some functions with
automatic measuring range selection (AUTO). At the threshold areas, it is advisable to fi x the
measuring range in order to prevent unwanted switching.
Press the RANGE (-) button (10d) to switch to the manual measuring range selection. The indication
“AUTO” will go out in the display (if the manual measuring range selection is selected).
Set the desired measuring range by pressing the RANGE (-) button repeatedly.
To switch back to the automatic measuring range selection, hold down the RANGE (-) button for 2 s.
“AUTO” will again appear in the display (provided the autorange function is possible in this measuring
range).
107
j) Mesure de tension alternative avec un fi ltre passe-bas de 1 kHz
N’utilisez jamais l’option du fi ltre passe-bas pour contrôler la présence de tensions
dangereuses ! Dans certaines circonstances, les tensions existantes peuvent être
supérieures à ce qui est indiqué. Effectuez toujours d’abord une mesure de tension
sans le fi ltre pour détecter d’éventuelles tensions dangereuses.
Le DMM est équipé d’un fi ltre passe-bas à courant alternatif. Il s’agit d’une mesure de tension
alternative qui s’effectue par le biais d’un fi ltre passe-bas qui bloque les tensions indésirables au-
dessus de 1 kHz.
Pour effectuer une mesure de tension AC avec le fi ltre passe-
bas, procédez comme suit :
1. Allumez le DMM et sélectionnez la plage de mesure « V
».
Appuyez sur la touche SHIFT/SETUP (3) pour commuter sur
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. 10).
3. Raccordez les deux pointes de mesure à l´objet à mesurer
(générateur, circuit etc.). La valeur mesurée s’affi che à l’écran.
4. À la fi n de la mesure, retirez les cordons de mesure de l’objet
à mesurer et éteignez le DMM.
Fig. 10
12. FONCTION RANGE, SÉLECTION MANUELLE
DE LA PLAGE DE MESURE
La fonction RANGE permet, dans certaines fonctions de mesure avec sélection de la plage de mesure
automatique (AUTO), une sélection manuelle de la plage de mesure. Dans les plages limites, il est
conseillé de fi xer la plage de mesure pour empêcher toute commutation accidentelle.
Appuyez sur la touche RANGE (-) (10d) pour commuter vers la sélection manuelle de la plage de
mesure. Dès que vous avez choisi la sélection manuelle de la plage de mesure, l’indication «AUTO»
disparaît de l’écran.
Sélectionnez maintenant la plage de mesure désirée en appuyant plusieurs fois sur la touche
RANGE (-).
Pour revenir à la sélection automatique de la plage de mesure, maintenez la touche RANGE (-)
enfoncée pendant 2 s. « AUTO » s’affi che à nouveau à l’écran (à condition que la fonction Autorange
soit disponible dans cette plage de mesure).
… 64 …


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