3B Scientific ESCOLA2 User Manual

3B SCIENTIFIC

Multimeter Escola 2 1006811

Instruction sheet

01/13 ALF

®

PHYSICS

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 meas­urement, 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 han­dled 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 particu­lar attention to the insulation surrounding the
measurement sockets.

• The limit of the measurement range must

not be exceeded. If the values of the meas­urand 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 discon­nect 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 dis­connected from the meter.

• When disposing empty batteries follow the

local regulations. Never dispose of them in
the regular household garbage.

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2. Symbol legend

Read instruction sheet

V Voltage
A Current

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 rectifica­tion (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 auto­matically 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
Dimensions: 98x148x49 mm

…20 kHz

3

approx.

Weight: 300 g approx.

5. Operation

• Switch the device on by select the desired

operating mode,

• 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

or

.

.

.

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 measure­ment 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 accu­rately centre the zero position on the scale.

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