3B SCIENTIFIC PHYSICS Escola 2 Fiche d'instruction - Page 2

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2. Symbol legend

Read instruction sheet

Voltage

Current

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:

Source impedance:

Current ranges:

Voltage drop for current

measurements:

Accuracy:

Electrical zerocalibration: For all DC ranges

Accuracy for zero centre: Class 5

Scale length:

Power supply:

Overload protection:

Frequency range:

Dimensions:

Weight:

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

5.1 Current and voltage measurements

•

Conduct all normal current and voltage

measurements with the operating mode

switch in the position

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.

0.3; 1; 3; 10; 30 V AC/DC

10 kOhm/V

1; 10; 100; 1000;

3000 mA AC/DC

100 mV AC/DC approx.

DC class 2

AC class 3

80 mm

1x 1.5 V, IEC R6 with

test function

Up to ± 50 V AC/DC

peak

20 Hz...50Hz...20 kHz

98x148x49 mm

approx.

300 g approx.

. This way, setting