3B SCIENTIFIC PHYSICS Escola 2 1006811 Instruction Sheet - page 3
3
3. Technical data
Dimensions:
98 x 148 x 49 mm
approx.
Weight:
300 g approx.
Scale length:
80 mm
Pointer deflection
0…90°
Operating alignment:
Vertical/horizontal
Power supply:
1x 1.5 V, AA IEC LR6
Connectors:
4-mm safety sockets
Voltage ranges:
0.3, 1, 3, 10, 30 V
AC/DC
Internal resistance:
10 kΩ/V
Current ranges:
1, 10, 100, 1000,
3000 mA AC/DC
Voltage drop when
measuring current:
100 mV approx. AC/DC
Accuracy:
DC Class 2
AC Class 3
Electrical
zero-point offset:
in all DC ranges
Accuracy with
zero-point offset:
Class 5
Frequency range:
20 Hz…50Hz…20 kHz
Signal form:
Sine (1% max. discrep-
ancy)
Peak factor:
2
Overload protection:
Up to ± 50 V AC/DC
peak value
Ambient temperature: 5°C...23°C…40°C
Storage temperature: -20…70°C
Relative humidity:
< 85% with no conden-
sation
Shock tests:
max. 147 m/s²
Electrical safety:
Safety specifications:
EN 61010-1
Excess voltage
category:
CAT I: 600 V
Contamination level:
2
Protection type:
IP20
Electromagnetic compatibility:
Interference emission: EN 55011:2009
Interference resistance: EN 61326-1:2013
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,
or
.
•
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
and the measuring range
switch to
. In the
range, the
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
. 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.