3B SCIENTIFIC PHYSICS Escola 2 Manual de usuario

3B SCIENTIFIC®PHYSICS

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. 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

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

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.

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