32
Measuring
Do not exceed the maximum permitted input values. Do not contact circuits or parts
of circuits if there could be voltages higher than 25 V ACrms or 35 V DC present with-
in them. Mortal danger!
Before measuring, check the connected measuring lines for damage such as, for
example, cuts, cracks or squeezing. Defective measuring cables must no longer be
used. Mortal danger!
During measuring, do not grip beyond the tangible grip range markings present on
the test prods.
Ꮨ
You may only connect the two measuring leads to the measuring device that are
required for measuring operation. Remove all measuring leads not required from the
device for safety reasons.
☞
As soon as „OL“ (overload) appears on the display, you have exceeded the measuring
range. Select the next higher measuring range
The voltage range „V/DC“ has an input resistance of >10 MOhm, the V/AC range of >4.5
MOhm.
With the VC170, the automatic range selection (auto range) is active in all measuring func-
tions (except for currency measuring ranges). This function sets the right measuring range
automatically.
a) Voltage measuring “V”
Before measuring voltages, always make sure that the measuring instrument is not set to a measuring
range for currents.
Measuring socket selection and assignment of the black and red measuring cable
DMM
black
red
VC130
COM (5)
V (8)
VC150
COM (5)
V (8)
VC170
COM (5)
V (8)
Proceed as follows to measure DC voltages „DC“ (V
):
-
Turn the DMM on (VC130/150 on the “POWER” switch (3) and the VC170 on the rotary switch).
Select the measuring range “V
.
-
Insert the measuring cables into the corresponding measuring sockets as shown in the table.
-
Now connect the two measuring prods to the object to be measured (battery, switch etc.).
The red measuring tip indicates the positive pole, the black measuring tip the negative pole.
-
The polarity of the respective measuring value is indicated on the together with the current measur-
ing value.
☞
As soon as a minus “-” appears for the direct voltage in front of the measuring value, the
measured voltage is negative (or the measuring tips have been mixed up).
