Manual Voltcraft VC135 (page 31 of 78) (English, German, Dutch, French)

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Proceed as follows to measure DC currents “µA, mA, A”

AC current is not supported by this DMM. Do not attempt to measure AC currents

with this DMM.

Insert the red measuring lead into the 10 A max socket (10) if you are not sure about the size

of the current.

1. Turn the DMM on and select the measuring range “A ” with the rotary switch (5). The values

on the rotary switch (5) indicates the maximum measurement value of that selection. Try to start

measuring with the largest measuring range if possible, because the ne fuse will trigger in case

of excess current.

2. Insert the red measuring lead into the 10 A max socket (10) (with currents > 400 mA) or into the

mAμA socket (8) (with currents <400 mA). Plug the black measuring lead into the COM socket.

3. Now connect the two test prods in series with the object to be measured (battery, circuit etc.); the

display indicates the polarity of the measured value together with the currently measured value.

The unit of the measurement is µA, mA or A (depends on the measuring range selected).

As soon as a minus “-” appears for the direct voltage measuring in front of the measuring value,

the measured voltage is negative (or the measuring tips have been mixed up).

c) Resistance measuring

Make sure that all the circuit parts, switches and components and other objects of

measurement are disconnected from the voltage and discharged.

Proceed as follows to measure the resistance:

1. Turn the DMM on and select measuring range “Ω”.

2. Insert the red measuring lead into the Ω socket (8) and the black measuring lead into the COM

socket (9).

3. Check the measuring leads for continuity by connecting both measuring leads to one another. After

that the resistance value must be approximately 0.5 Ω (inherent resistance of the measuring leads).

4. Now connect the measuring prods to the object to be measured. As long as the object to be

measured is not high-resistive or interrupted, the measured value will be indicated on the display.

Wait until the display has stabilised. With resistances of >1 MΩ, this may take a few seconds.

5. As soon as “1” (towards the left side of the display) appears on the display, you have exceeded

the measuring range or the measuring circuit has been broken. Select a larger measuring range

if necessary.

6. After measuring, remove the measuring leads from the measuring object and turn the DMM off.

Turn the rotary switch (5) to the position “OFF”.

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Voltcraft VC135 Manual

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