3B SCIENTIFIC PHYSICS Escola 2 1006811 Instructieblad - Pagina 3

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3. Technical data

Dimensions:

Weight:

Scale length:

Pointer deflection

Operating alignment:

Power supply:

Connectors:

Voltage ranges:

Internal resistance:

Current ranges:

Voltage drop when

measuring current:

Accuracy:

Electrical

zero-point offset:

Accuracy with

zero-point offset:

Frequency range:

Signal form:

Peak factor:

Overload protection:

Ambient temperature: 5° C...23°C...40° C

Storage temperature:

Relative humidity:

Shock tests:

Electrical safety:

Safety specifications:

Excess voltage

category:

Contamination level:

Protection type:

Electromagnetic compatibility:

Interference emission: EN 55011:2009

Interference resistance: EN 61326-1:2013

98 x 148 x 49 mm

approx.

300 g approx.

80 mm

0...90°

Vertical/horizontal

1x 1.5 V, AA IEC LR6

4-mm safety sockets

0.3, 1, 3, 10, 30 V

AC/DC

10 kΩ/V

1, 10, 100, 1000,

3000 mA AC/DC

100 mV approx. AC/DC

DC Class 2

AC Class 3

in all DC ranges

Class 5

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

Sine (1% max. discrep-

ancy)

Up to ± 50 V AC/DC

peak value

-20...70° C

< 85% with no conden-

sation

max. 147 m/s²

EN 61010-1

CAT I: 600 V

IP20

4. 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. This

makes it possible to acquire qualitative readings

of alternating quantities with signal frequencies

up to in excess of 40 kHz.

The use of a robust moving coil galvanometer

and a mechanically resilient casing make it pos-

sible to use the equipment even under highly

challenging conditions.

The excess current protection of the Escola 2

automatically limits the power when overloaded.

After a brief cooling phase, the multimeter auto-

matically switches on again.

5. Operation

Switch the multimeter on by select the de-

•

sired operating mode,

To turn off the multimeter, set the mode

•

switch to the off position

To test the battery, disconnect all leads from

•

the multimeter, set the operating mode

switch to

needle should deflect all the way to the end.

If this is not the case, the battery must be

replaced immediately.

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.

and the measuring range

. In the

range, the

. This way, setting