3B SCIENTIFIC PHYSICS Escola 2 User manual

3B SCIENTIFIC®PHYSICS
1
Multimeter Escola 2 1006811
Instruction sheet
01/13 ALF
1 Meter display with mirror scale
2 Slotted screw for zero calibra-
tion
3 Adjustment knob for zero cali-
bration
4 Measurement range dial
5 Operating mode switch
6 Safety measurement socket
7 Safety ground socket
1. Safety instructions
The Escola 2 multimeter conforms to the safety
requirements for electrical equipment for meas-
urement, control and laboratory use in DIN EN
61010 part 1. Safe operation of the apparatus is
guaranteed with correct handling. However,
safety is not guaranteed if the apparatus is han-
dled improperly or carelessly.
•Read this manual carefully before using the
multimeter and follow the instructions!
•Before using the meter, check the case and
test leads for any damage. In the event of
any malfunction/operational defect or visible
damage, do not use the meter. Pay particu-
lar attention to the insulation surrounding the
measurement sockets.
•The limit of the measurement range must
not be exceeded. If the values of the meas-
urand are unknown, always switch from a
higher measurement range to a lower one.
•Do not conduct measurements in a humid
environment. Work area, hands, shoes and
floor must be dry.
•When measuring current, turn off circuit
power before connecting the meter in the
circuit.
•Connect the common test lead before you
connect the live test lead. When you discon-
nect test leads, disconnect the live test lead
first.
•Before the case is opened, the meter has to
be switched off and the leads must be dis-
connected from the meter.
•When disposing empty batteries follow the
local regulations. Never dispose of them in
the regular household garbage.

2
2. Symbol legend
Read instruction sheet
VVoltage
ACurrent
Moving coil galvanometer
Apparatus with electronic amplifier
DC quantities accuracy class 2
AC quantities accuracy class 3
Use in horizontal position
2
Test voltage
Use in vertical position
DC quantities
AC quantities
Needle position zero centre
“OFF” position
3. Description
The Escola 2 is a meter for use by students to
measure to measure voltages and currents
(both DC and AC quantities) in low voltage
ranges.
All measurement ranges are selected by means
of a rotary dial. Two linearised mirror scales,
graded in a 1:3 ratio, guarantee easy readability
of the measured values.
The trimmer for setting the zero point in the
centre allows the zero point to be set precisely
when it drifts electrically.
AC quantities are calibrated for a sinusoidal
waveform. Conversion and linearisation of the
measurement is achieved by half-wave rectifica-
tion (positive half-wave) using an op-amp.
The use of a robust moving coil galvanometer
and a mechanically resilient chassis also allows
for rough operating conditions.
The overcurrent protection of the Escola 2
automatically limits the power when overloaded.
After a brief cooling phase, the apparatus auto-
matically switches on again.
4. Technical data
Voltage ranges: 0.3; 1; 3; 10; 30 V AC/DC
Source impedance: 10 kOhm/V
Current ranges: 1; 10; 100; 1000;
3000 mA AC/DC
Voltage drop for current
measurements: 100 mV AC/DC approx.
Accuracy: DC class 2
AC class 3
Electrical zerocalibration: For all DC ranges
Accuracy for zero centre: Class 5
Scale length: 80 mm
Power supply: 1x 1.5 V, IEC R6 with
test function
Overload protection: Up to ± 50 V AC/DC
peak
Frequency range: 20 Hz…50Hz…20 kHz
Dimensions: 98x148x49 mm3approx.
Weight: 300 g approx.
5. Operation
•Switch the device on by select the desired
operating mode, or .
•To turn off the multimeter, set the mode
switch to the off position .
•To test the battery, set the measurement
range dial to the position .
5.1 Current and voltage measurements
•Conduct all normal current and voltage
measurements with the operating mode
switch in the position . This way, setting
the measurement range with the measure-
ment range dial automatically takes care of
AC/DC switchovers.
•Connect the lower measurement potential to
the left-hand socket. For DC quantities, the
positive polarity should always be connected
to the right-hand socket.
5.2 Measurements with the zero position of
the needle centred
This mode of measurement only works for the
DC current and DC voltage ranges.
•For measurements requiring the zero posi-
tion of the needle position to be centred, set
the operating mode switch to the position
.
•Before connecting the external quantity to be
measured, use the adjustment knob to accu-
rately centre the zero position on the scale.

3B Scientific GmbH ▪Rudorffweg 8 ▪21031 Hamburg ▪Germany ▪www.3bscientific.com
Subject to technical amendments
© Copyright 2013 3B Scientific GmbH
5.3 Changing the battery
5.3.1 General information
•From time to time, check the state of the
battery.
•Remove discharged or corroded bat-
teries from the apparatus.
•During prolonged periods of disuse,
also remove the battery from the apparatus.
•Do not dispose of the battery in the regular
household garbage. Follow the local regula-
tions (In Germany: BattG; EU: 2006/66/EG).
5.3.2 Changing the battery
•Unscrew the back of the chassis.
•Place the negative pole of the battery on the
spring.
The polarity is also marked on the board with
plus and minus symbols. Additionally, a me-
chanical clip on the positive side prevents bat-
tery contact when polarity is reversed.
•Close chassis again.
Fig. 1 Changing the battery
6. Maintenance
•This apparatus does not require special
maintenance.
•For cleaning, use a soft cloth, slightly mois-
tened with alcohol, or a brush.
•In order to remove a potential electrostatic
charge from the meter display window,
which can easily influence measurements,
follow the instructions above.
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 measure-
ment socket.