VOLTCRAFT VC-11 Mode D'emploi page 3

OPERATING INSTRUCTIONS
DIGITAL MULTIMETER VC-11
ITEM NO.: 122999
INTENDED USE
• Measuring and displaying electric parameters in the range of excess voltage category III
(up to max. 250V against ground potential, pursuant to EN 61010-1) or lower
• Measuring direct and alternating voltage up to a maximum of 250 V
• Measurement of direct current up to max. 200 mA
• Also designed to measure resistance values of up to 2000 kOhm
• Diode test
• Battery test for 9 and 1.5V batteries under load condition
• Rectangular signal generator
Operation is only permissible using the stated battery type (2 x LR44 or identical).
The measuring instrument must not be operated when it is open, i.e. with an open battery or fuse compartment. Measuring in
damp rooms or under unfavourable ambient conditions is not admissible.
Unfavourable ambient conditions are:
• Wetness or high air humidity
• Dust and flammable gases, vapours or solvent,
• Thunderstorms or similar conditions such as strong electrostatic fields etc.
Any use other than the one described above damages the product. Moreover, this involves dangers such as e.g. short circuit,
fire, electric shock, etc. No part of the product must be modified or rebuilt!
The multimeter (referred to as DMM in the following) indicates measured values on the digital display. The measuring value
display of the DMM comprises 2000 counts (count = smallest display value).
The individual measuring ranges are selected via a rotary switch.
The measuring circuit is protected against overload with a fine-wire fuse. The fuse is located in the red test prod.
For safety reasons, the measuring cables are permanently connected to the measuring device and cannot be changed.
The measuring device can be used for do-it-yourself or for professional applications.
The safety instructions must be followed unconditionally!
a) Explanations of symbols and units on the multimeter
V Alternating voltage
V Direct voltage
V Volt (unit of electric potential)
mV Millivolt (exp.-3)
mA Milliampere (unit of electric current, exp.-3)
µA Microampere (exp.-6)
Ω Ohm (unit of electric resistance)
kΩ Kilo Ohm (exp.3)
Diode test
Battery test
Rectangular signal generator
CAT III Overvoltage category 3
SAFETY INSTRUCTIONS
Please read through the operating instructions carefully before putting the device into operation. They
contain important information concerning proper operation. The guarantee will be void if damage is
incurred resulting from non-compliance with the operating instructions! We assume no liability for any
consequential damage! We do not assume liability for personal injury or material damage resulting
from improper use or disregarding the safety instructions! In such cases the warranty is voided!
This device left the manufacture's factory in a safe and perfect condition. We kindly request the user to observe the safety
instructions and warnings contained in this operating manual to preserve this condition and to ensure safe operation!
Please observe the following symbols:
A triangle containing an exclamation mark indicates important information in these operating instructions
which is to be observed without fail.
The triangle containing a lightning symbol warns of danger of an electric shock or of the impairment of the
electrical safety of the device.
The symbol indicates special information and advice on operation of the device.
This product has been CE-tested and meets the necessary European guidelines.
Class 2 insulation (double or reinforced insulation)
Overvoltage category III for measuring building wiring installation (e.g. outlets or sub-distributions). This
category also covers all smaller categories (e.g. CAT II for measuring electronic devices).
Ground potential
The unauthorised conversion and/or modification of the unit is inadmissible because of safety and approval reasons (CE).
Consult an expert when in doubt about the operation, the safety or the connection of the device.
Measuring instruments and accessories are not toys and have no place in the hands of children.
In commercial and industrial facilities the regulations for the prevention of accidents as laid down by the professional trade
association for electrical equipment and devices need to be observed.
In schools, training centres, computer and self-help workshops, handling of measuring instruments must be supervised by
trained personnel in a responsible manner.
Before measuring voltages, always make sure that the measuring instrument is not set to a measuring range for currents. The
voltage between the measuring instrument and earth must never exceed 250 V DC/AC in CAT III.
The test prods have to be removed from the measured object every time the measuring range is changed.
Take particular care when dealing with voltages exceeding 25V AC or 35V DC! Even at these voltages it is possible to get a fatal
electric shock if you touch electric conductors.
Check the measuring device and its measuring lines for damage before each measurement. Never carry out any measurements
VERSION 03/15
if the protecting insulation is defect (torn, ripped off etc.)
To avoid an electric shock, make sure not to touch the connections/measuring points to be measured neither directly nor
indirectly during measurement. When during measuring, do not grip beyond the grip range markings present on the test prods.
Do not use the multimeter immediately before, during or after thunder and lightning (thunderstrike / high-energy overvoltages!).
Please make sure that your hands, your shoes, your clothing, the floor, switches and switching components are dry.
Avoid an operation near:
• strong magnetic or electromagnetic fields
• transmitter aerials or HF generators
This may falsify the measuring value.
If you have reason to assume that safe operation is no longer possible, disconnect the device immediately and secure it against
inadvertent operation. It can be assumed that safe operation is no longer possible if:
• the device is visibly damaged,
• the unit does not operate any longer and
• the unit was stored under unfavourable conditions for a long period of time or
• if it has been subjected to considerable stress in transit.
Do not switch the measuring instrument on immediately after it has been taken from a cold to a warm environment.
Condensation water that forms might destroy your device. Leave the device switched off and wait until it has reached room
temperature.
Do not leave the packaging material lying around carelessly since such materials can become dangerous toys in the hands
of children.
You should also heed the safety instructions in each chapter of these instructions.
DELIVERY SCOPE
• Multimeter with permanently attached measuring leads
• 2 LR44 batteries (or identical batteries)
• Operating instructions
INITIAL OPERATION
The batteries are already inserted in the DMM upon delivery.
a) Rotary switch
The individual measuring functions can be set via the rotary switch. If the rotary switch is set to „OFF", the measuring device
is switched off. Always turn the measuring device off when it is not in use.
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 within them. Mortal danger! Before
measuring, check the connected measuring cable for damage such as, for example, cuts, cracks
or squeezing. Defective measuring cables must no longer be used. Mortal danger!
a) Voltage measuring „V"
Proceed as follows to measure DC voltages (V
• Turn the DMM on on the rotary switch and select the right measuring range for your
voltage „V "
• Now connect the two test prods to the object to be measured (battery, circuit 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 measuring 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).
• After you finish testing, always switch the measuring device off. Turn the rotary switch to „OFF".
Proceed as follows to measure AC voltages (V
• Turn the DMM on on the rotary switch and select the right measuring range for your voltage „V
• Now connect the two measuring prods to the object to be measured (generator, switching
etc.).
• The measuring value is indicated on the display
The voltage range „V DC/AC" shows an input resistance of >1 MOhm.
• After you finish testing, always switch the measuring device off. Turn the rotary switch to „OFF".
b) Resistance measuring
Make sure that all the circuit parts, switches and components and other objects of measurement are
disconnected from the voltage at all times.
Proceed as follows to measure the resistance:
• Turn the DMM on on the rotary switch and select the right measuring range for your voltage „Ω".
• Check the measuring leads for continuity by connecting both measuring prods to one another. After that the resistance value
must be approximately 3 Ohm.
• 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.
• As soon as „1" (= overflow) appears on the display, you have exceeded the measuring range
or the measuring circuit has been interrupted. Switch to the next higher measuring range.
• After you finish testing, always switch the measuring device off. Turn the rotary switch to
„OFF".
If you carry out a resistance measurement, make sure that the measuring points which you contact with the test prods
are free from dirt, oil, solderable lacquer or the like. An incorrect measurement may result under such circumstances.
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