3B SCIENTIFIC PHYSICS 1017895 User manual

3B SCIENTIFIC®PHYSICS
1
Demo Multimeter 1017895
Instruction sheet
12/16 SD/JS
1. Description
The demo-multimeter is an electronic meter fea-
turing a double scale for analog measurement of
current and voltage in demonstration experi-
ments. It is suitable for use as a free-standing in-
strument or for setting up in training panel frames.
The meter can handle measurements of current
and voltage values and also allows the zero point
to be set up in the centre of the scale for meas-
urement of DC quantities. All the possible meas-
uring ranges can be selected by means of a sin-
gle rotary switch.
This equipment is protected by fuses and au-tho-
rised for making measurements in circuits directly
connected to the low-voltage mains via plugs
(CAT II), i.e. for measurements on house-hold
appliances, for example. The current measuring
ranges are resistant to long-term overloading up
to 10 A. Generous protection of all the current
ranges by means of semiconductor circuit break-
ers prevents the fuse blowing unintentionally in
many cases.
Switching between measuring ranges does not
break any circuits connected to the equipment.
This means it is possible to carry out measure-
ments on voltage converters, for example, with-
out causing induction surges. Resistance R, con-
ductance G, impedance Zand admittance Ycan
easily be determined as quotients of current and
voltage measurements thanks to the non-inter-
rupting switch capability without the need to
change the wiring.

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2. Safety instructions
The demo multimeter conforms to safety regula-
tions for electrical measurement, control and la-
boratory equipment, as specified in DIN EN
61010-1, protection class 2 and to measuring ca-
tegory CAT II for up to 600 V. The nominal volt-
age between the phase conductors and the neu-
tral for voltage and current measurements (in cir-
cuits directly connected to mains electricity) must
not exceed 600 V in order to conform to CAT II.
The meter is intended for measurements within
its measuring ranges and in a measuring environ-
ment as described in detail in the course of this
manual. Safe operation of the multimeter is gua-
ranteed if it is solely used as specified. Safetycan-
not be guaranteed, however, if the multimeter is
used incorrectly or handled without due care and
attention. In order to avoid serious injury due to
current or voltage shocks, the following safety in-
structions are to be observed at all times.
The multimeter may only be used by persons who
are able to recognise the risks of contact and take
due precautions to avoid them. Voltages in ex-
cess of 33 V AC (RMS) or 70 V DC are to be re-
garded as actively dangerous if the current,
charge or energy stored should exceed certain
values (see DIN EN 61010-1).
Carefully read the instruction manual before
using the multimeter and obey the instruc-
tions therein.
The multimeter may only be used in a dry,
dust-free environment with no risk of explo-
sions occurring.
The assumption needs to be made that unfore-
seen voltages may be present in the vincinity of
objects being measured (e.g. faulty equipment).
Before using the multimeter, check the hou-
sing and measuring leads for damage and if
there should be any malfunctions or visible
damage, the multimeter is not to be used.
Pay specific attention to the insulation for the
measuring sockets.
The multimeter may not be used to make
measurement on circuits which exhibit co-
rona discharge (high voltage).
Particular care is to be taken when making
measurements on high-frequency circuits
where dangerous voltages may arise due to
superimposition of components.
The authorised measuring range is not to be
exceeded. If measurements are made when
the magnitude of the variable is unknown, al-
ways select a large measuring range before
shifting down to lower ones.
Make very sure that the voltage value be-
tween the measured contact and earth or be-
tween the ground socket and the measure-
ment socket does not exceed 600 V.
Before using the analogue multimeter to
check that a voltage source is not exhibiting
any actual voltage, check that the meter is
working properly by selecting the battery test
function.
When measuring current, make sure the
electricity is turned off before the analogue
multimeter is connected into the circuit.
When making measurements, always con-
nect the ground lead first. Disconnect the sig-
nal measurement lead before unplugging the
ground.
Turn off the multimeter before opening the
casing, disconnect the power to the circuit
and the measuring leads from the multimeter.
If measurements are made where there are any
risks of coming into contact with electricity, a sec-
ond person is to be informed.
The demo-multimeter should not be stored,
set up or operated within reach of children.
When the multimeter is used by teenagers,
trainees etc., a suitable person should super-
vise to ensure the equipment is used safely.
If measurements are to be made where volt-
ages exceed 33 V AC (RMS) or 70 V DC, be
especially careful and only use safety experi-
ment leads.
Measuring categories according to DIN EN
61010-1.
CAT I or unstipulated: Approved for measure-
ments in circuits which are not directly connected
to the low voltage mains grid (e.g. batteries).
CAT II: Approved for measurements in circuits
which are directly connected, by a mains lead
and plug for instance, to the low voltage mains
grid (e.g. household or office appliance and lab
equipment).
CAT III: Approved for measurements in circuits
which are part of a building’s wiring installation
(e.g. stationary consumers, distribution terminals,
appliances connected directly to the distribution
box).
CAT IV: Approved for measurements in circuits
which are directly connected to the source of the
low voltage mains (e.g. electricity meters, main
service feed, primary excess voltage protection).

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3. Technical data
Display:
Scales: 0 … 10, linear
0 … 3, linear
Scale length: 160 mm
Pointer deflection: 0…90°
Electrical
zero-point offset: in all DC ranges
Measurements:
Voltage ranges: 0.1/ 0.3/ 1/ 3/ 10/ 30/
100/ 300/ 600 V AC/DC
Current ranges: 0.1/ 0.3/ 1/ 3/ 10/ 30/
100/ 300 mA AC/DC
1/ 3/ 10 A AC/DC
Input resistance: 1 MΩ AC/DC
Voltage drop when
measuring current: 100 mV approx. AC/DC
Reference conditions:
Ambient temperature: 23 °C
Operating alignment: Vertical
Signal form: Sine (1% max. discrep-
ancy)
Peak factor:
2
Frequency range: 40 Hz … 50 Hz … 5 kHz
Accuracy (at reference conditions):
DC quantities: Class 2
DC with
zero-point offset: Class 5
AC quantities: Class 3
Extended frequency range (class 10):
3 –600 V: 40 Hz …50 Hz …40 kHz
0,3 –1 V: 40 Hz …50 Hz …10 kHz
0,3 –3000 mA: 40 Hz …50 Hz …40 kHz
10 A: 40 Hz …50 Hz …40 kHz
Resistance, conductance, impedance, admit-
tance
These quantities can be determined by forming
various quotients involving “simultaneous meas-
urements” of current and voltage.
R= U/ I: below 1 mΩ … above 10 MΩ
S= I/ U: below 1 µS … above 30 S
Z= U/ I: below 1 mΩ … above 10 MΩ,
40 Hz … 40 kHz
Y= I/ U: below 1 µS … above 30 S,
40 Hz … 40 kHz
Overload protection:
Voltage ranges: 600 V long-term in all
voltage ranges
Current ranges: 10 A of long-term load-
ing in 3-A and 10-A
ranges
Electrical safety:
Safety specifications: EN 61010-1
Measuring category: CAT II: 600 V
Contamination level: 2
Protection type: IP20
Connectors: 4-mm safety sockets
Protection:
Fuses: 2x FF 10 A/600 V
(10 x 38 mm)
Breaking capacity: at least 10 kA
3B order number: 5008564
Power supply:
Battery: 1x 1.5 V, AA IEC LR6
Automatic cut-off after: 45 min ± 10 min
Electromagnetic compatibility:
Interference emission: EN 55011:2009
Interference resistance: EN 61326-1:2013
Operating conditions:
Ambient temperature: 5 °C ... 23 °C … 40°C
Storage temperature: -20 … 70°C
Relative humidity: <85% with no conden-
sation
General data:
Shock test: max. 147 m/s²
Height: 297 mm
Dimensions: 259 x 297 x 125 mm3
Weight: 1,7 kg approx.

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4. Control elements
4.1 Front
1 Display
2 Slotted screw for zero calibration
3 Toggle switch 1
Zero point centre / left
4 Calibration trimmer for setting
centre zero point
5 Rotary switch to select the mea-
surement range
6 Ground socket
7 Current measurement socket for
up to 3 A
8 Current measurement socket for
up to 10 A
9 Voltage measurement socket
10 Toggle switch 2
AC / DC voltage measurements
11 Power switch
4.2 Rear
12 Cover plate for battery and
fuses
13 Rating plate
14 Fuse diagram
15 Lower edge
16 Feet

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5. Symbol legend
Display
Hazard, read instruction sheet
Moving coil galvanometer
Apparatus with electronic amplifier
DC quantities accuracy class 2
AC quantities accuracy class 3
Use in vertical position
Dial position when turned off
Dial position for battery test when bat-
tery charge is satisfactory
Front
Meter on
Meter off
AC measurements
DC measurements
Zero point centre
Zero point left
Battery test
Ground symbol
Rear
EU conformitymark
Earth symbol
Electrical safety assured by double insu-
lation
Do not dispose in normal domestic waste
For use indoors only
Electric fuse
6. Initial calibration
Set up the demo multimeter vertically.
Do not connect measuring leads to begin
with.
Set the toggle switch 1 to .
Set the power switch to .
The needle will point to the zero point of the scale
on the left. If it does not, the amount of charge of
the battery should be checked.
7. Operation
7.1 To switch on:
Set the power switch to .
7.2 Checking battery charge:
Turn on the demo-multimeter.
Disconnect all measuring leads.
Set the toggle switch 2 to .
Set the rotary switch to .
If the battery is sufficiently charged, the needle
will point to the following range indication,
. If this is not the case, the battery will
need to be replaced immediately.
7.3 Zero point calibration:
Turn on the demo-multimeter.
Turn the rotary switch to 600 V.
Connect the common/ground socket and the
voltage measurement socket together by
means of a short connecting lead.
Turn the zero-point trimmer screw to adjust
the zero point as needed.
7.4 Zero point calibration for centre zero
point:
For measurements of DC current and voltage, the
zero point of the scale can be moved to the centre
of the dial. For this purpose the scales are la-
belled with red numbers..
Turn on the demo-multimeter.
Disconnect all measuring leads.
Set the toggle switch 2 to .
Set the toggle switch 1 to .
Use the zero-point trimmer to line up the nee-
dle precisely in the centre of the dial (red di-
vision).
7.5 To switch off:
Set the power switch to .
Set the four-way switch to .
When the meter is turned off, the needle points to
.
7.6 If a measurement is interrupted by battery
cut-out:
After 45 minutes of use, the multimeter is auto-
matically shut off and the needle will then point to
.
To switch back on:
Set the power switch of the multimeter to off
and then use it to turn the meter back on.

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8. Current measurements up to 3 A
The demo-multimeter may NOT be
used for direct measurements on a
building’s electrical wiring installation
or directly at the source of the mains
voltage feed to the junction box. See
page 2 of “Measurement categories”
as specified in DIN EN 61010-1.
The nominal voltage of the current
source may not exceed 600 V.
The multimeter is to be connected
in series with the load on the side
where the voltage with respect to
ground is lowest!
Turn off the circuit before meter is
connected into it.
If measurements are made when the magni-
tude of the variable is unknown, always select
a large measuring range before shifting down
to lower ones.
Connect the terminal at the lower potential to
the common/ground socket.
Connect the common/ground lead first and
only then the signal lead.
8.1 DC currents up to 3 A:
Set the toggle switch 2 to .
Alternatively, if measurements are to be
made with the zero point in the centre, then
set the toggle switch 1 to .
Select the required current measuring range
to a range measured in mA or A.
8.2 AC currents up to 3 A:
Set the toggle switch 2 to .
Select the required current measuring range
to a range measured in mA or A.
9. Current measurements up to 10 A
The demo-multimeter may NOT be
used for direct measurements on a
building’s electrical wiring installation
or directly at the source of the mains
voltage feed to the junction box. See
page 2 of “Measurement categories”
as specified in DIN EN 61010-1.
The nominal voltage of the current
source may not exceed 600 V.
The multimeter is to be connected
in series with the load on the side
where the voltage with respect to
ground is lowest!
Turn off the circuit before meter is
connected into it.
Set up a measuring range of 10 A.
Connect the terminal at the lower potential to
the common/ground socket.
Connect the common/ground lead first and
only then the signal lead.
9.1 DC currents up to 10 A:
Set the toggle switch 2 to .
Alternatively, if measurements are to be
made with the zero point in the centre, then
set the toggle switch 1 to .
9.2 AC currents up to 10 A:
Set the toggle switch 2 to .
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10. Voltage measurements
The demo-multimeter may NOT be
used for direct measurements on a
building’s electrical wiring installation
or directly at the source of the mains
voltage feed to the junction box. See
page 2 of “Measurement categories”
as specified in DIN EN 61010-1.
The nominal voltage of the voltage
source may not exceed 600 V.
If measurements are made when the magni-
tude of the variable is unknown, always select
a large measuring range before shifting down
to lower ones.
Connect the common/ground lead first and
only then the signal lead.
10.1 DC voltages up to 600 V:
Set the toggle switch 2 to .
Alternatively, if measurements are to be
made with the zero point in the centre, then
set the toggle switch 1 to .
Select the required measuring range to a
range measured in V.
For measurements of voltage up to 100 mV,
set the rotary switch to the range 0.1
mA/100 mV.
10.2 AC voltages up to 600 V:
Set the toggle switch 2 to .
Select the required measuring range to a
range measured in V.
For measurements of voltage up to 100 mV,
set the rotary switch to the range 0.1
mA/100 mV.
11. Measuring current and voltage together
The demo-multimeter may NOT be
used for direct measurements on a
building’s electrical wiring installation
or directly at the source of the mains
voltage feed to the junction box. See
page 2 of “Measurement categories”
as specified in DIN EN 61010-1.
The nominal voltage of the current
source may not exceed 600 V.
The multimeter is to be connected
in series with the load on the side
where the voltage with respect to
ground is lowest!
Turn off the circuit before meter is
connected into it.
11.1 DC voltages and currents:
Set the toggle switch 2 to .
Use the rotary switch to set the desired volt-
age measuring range and read off the meas-
urement.
Set a suitable current measuring range and
read off the measurement.
11.2 AC voltages and currents:
Set the toggle switch 2 to .
Use the rotary switch to set the desired volt-
age measuring range and read off the meas-
urement.
Set a suitable current measuring range and
read off the measurement.
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3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com
Subject to technical amendments
© Copyright 2016 3B Scientific GmbH
12. Battery and fuses
The demo-multimeter has a compartment which
houses both the battery and fuses and which is
accessible at the rear once its cover is opened.
One fuse each is provided for the 3 A and 10 A
sockets:
FF10 A/600 V, breaking capacity: at least 10 kA
(3B order number: 5008564)
The polarity is indicated by plus and minus signs
inside the fuse holder compartment. A mechani-
cal system ensures the battery makes no contact
if it is inserted the wrong way round.
Battery and fuse compartment
12.1 Battery testing:
Batteries which are discharged and have not
been used for a while may leak.
Check the amount of charge left in
the battery from time to time.
Flat or leaking batteries should be
removed from the meter.
If the demo multimeter goes unused
for a long period:
Remove the meter’s battery be-
fore reusing.
12.2 Changing the battery:
Before opening the casing:
Turn off the demo multimeter.
Disconnect all measuring leads.
Remove the cover at the rear.
Replace flat batteries with 1.5-V alkaline bat-
teries of size AA IEC LR6.
Place the negative pole of the battery on the
spring.
Close the cover again afterwards.
12.3 Changing fuses:
Before opening the casing:
Turn off the demo multimeter.
Disconnect all measuring leads.
Remove the cover at the rear.
Check the fuses.
Blown fuses should be replaced with ones of
the same rating.
Close the cover again afterwards.
13. Cleaning
For cleaning, use a soft cloth, slightly mois-
tened with alcohol, or a brush.
Electrostatic charging of the display window can
affect the measurements under certain circum-
stances:
To remove such charge, use a soft cloth
slightly soaked in alcohol or a paint brush.
Dirt or moisture in the measurement sockets can
affect readings.
Shake out any dirt that may be in the meas-
urement sockets.
Soak a new swab with isopropyl alcohol and
work around the inside of each measurement
socket.
14. Disposal
The packaging should be disposed of at local
recycling points.
Should you need to dis-
pose of the equipment it-
self, never throw it away in
normal domestic waste. If
being used in private
households it can be dis-
posed of at the local public
waste disposal authority.
Comply with the applicable regulations for the
disposal of electrical equipment.
Do not dispose of the batteries in the regular
household garbage. Follow the applicable le-
gal regulations (UK: Waste Batteries and Ac-
cumulators Regulations, EU: 2006/66/EC).