3B Scientific ESCOLA10 User Manual

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3B SCIENTIFIC
Multimeter Escola 10 1006810
01/13 ALF
®
PHYSICS
1 Meter display with mirror
scale
2 Slotted screw for zero
calibration
3 Adjustment knob for zero
calibration
4 Measurement range dial
5 Operating mode switch
6 Voltage measurement
socket
7 Current measurement
socket for up to 3 A
8 Current measurement
socket for up to 10 A
9 Safety ground socket
1. Safety instructions
The Escola 10 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!
The multimeter may only be used by people who are aware of the dangers of electric shock and are able to take the necessary safety pürecautions.
Whenever measurements are being made,
in which there is a danger of electric shock, a second person should always be informed.
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.
Use with caution when working above 30 V
AC rms, or 60 V DC. Such voltages pose a shock hazard.
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.
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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.
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
CAT II Measuring category II is intended for mak-
ing measurements on circuits directly connected to low-voltage üpwer supplies (EN 61010-1)
3. Description
The ESCOLA 10 multimeter enables precision measurements by analogue means in education, training and practical applications. It measures AC and DC voltage or current and provides for measurements with the needle centred on the dial for DC quantities. Resistance (R) and con­ductance (G) or impedance (Z) aund admittance (Y) can be obtained by division.
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.
Isolation of the sockets for voltage and current measurement allow both to be measured in succession simply by turning the range selector switch, without any need for reconnecting or changing the measuring leads.
Use of a robust core-magnet measuring instrument set-up and an impact resistant casing allows the instrument to withstand rough handling in awkward conditions.
The ESCOLA 10 is protected in such a way that over-loads in the selectable current ranges automatically cause the power to be limited.
4. Technical data
Measuring category CAT II Voltage ranges: 0.1; 0.3, 1; 3; 10; 30,
100, 300, 600 V; AC/DC
Current ranges: 0.1; 0.3; 1; 3; 10; 30;
100; 300 mA; 1; 3; 10 A AC/DC
Input resistance: 1
M AC/DC
Voltage drop for current measurements: 100 mV AC/DC approx.
Accuracy: DC class 2; AC class 3 Electrical zero
calibration: For all DC ranges Accuracy for zero
centre: Class 5 Frequency ranges:
1 V – 600 V: 20 Hz…50 Hz
0.3 V: 20 Hz…50 Hz
…20 kHz …9 kHz
Current ranges: 20 Hz…50 Hz…43 kHz Scale length: 80 mm Power supply: 1x 1.5 V, IEC R6 with
test function
Voltage overload ranges: 600 V load in those
voltage ranges for a
lengthy period Current overload protection ranges (except for 10 A range): Integral limiting load: 450 A
Surge current limit I
FMS
: 300 A
2
s
Long-term current
limit I
Dimensions: 98 x 148 x 49 mm
: 35 A
FAV
3
Weight: 300 g approx.
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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 measurement
Before making any current measurements, set
the mode switch to ate.
Connect the terminal at the lower potential
to the earth socket.
Currents of less than 3 A can be measured
between the earth socket and measuring socket "A".
Currents of less than 3 A can be measured
between the earth socket and measuring socket "A".Currents higher than 3 A should be measured between the earth socket and measuring socket "10A".
Set the switch to
desired measuring range. lf the current to be measured is unknown beforehand, set the measurement range dial to the highest range and work down.
The fact that measurements can be made with­out disconnecting the instrument and using overload protection without fuses means that converters may also be connected into the cir­cuit.
Fig. 1 Current measurement
5.2 Voltage measurement
Before making any voltage measurements, set
the mode switch to ate.
Use the "V" socket on the right for voltage
measurements.
Set the switch to
desired measuring range. lf the voltage to be measured is unknown beforehand, set the
, or .
.
or as appropri-
mode and select the
A
A10A
or as appropri-
mode and select the
V
V
measurement range dial to the highest range and work down.The 100 mV voltage range is associated with a current range of
0.1 mA.
A10A
Fig. 2 Voltage measurement
5.3 Simultaneous current and voltage
measurement
Isolated current and voltage sockets allow measure-ments of both current and voltage to be made in sequence without disconnecting the measuring leads. That means that in both AC and DC modes, resistance, conductance, im­pedance and admittance can all be calculated forming the appropriate quotients.
A10A
Fig. 3 Simultaneous current and voltage measure­ment
5.4 Resistance and conductance
According to the defining equation for a linear
resistance, R = U/I, or conductance G = I/U, the
Escola 10 can be connected in circuit as in Fig. 3 so that current and voltage can be measured one after the other, allowing for resistance measurements to be made over a range from m up to several M.
´Therefore conductances in a range from under1 µS up to 30 S can be measured by taking the reciprocal of the resistance.
One very key advantage of the Escola 10 is that the instrument, when connected as in Fig. 3, can measure both current and voltage ranges with­out having to disconnect it.
5.5 Impedance and admittance
If the circuit in Fig. 3 is powered by a sinusoidal AC voltage source instead of a DC source, us-
V
V
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ing the definitions for impedance Z = U/I and admittance Y = I/U means that AC measure-
ments can also be measured in a variety of ranges in a similar way to the DC quantities in
5.4. The Escola 10 is particularly useful in this re-
spect because it allows for measurements to be made not only at 50 Hz, but right across the low­frequency range.
5.6 Measurements with the zero point of the needle centred
This kind of measurement can only be made in DC ranges.
To make a measurement with the zero point
in the centre, push the mode switch to
Before measuring the external quantity,
.
calibrate the zero point using the trimmer to set the point in the direct centre of the scale.
The full extent of the measuring remains avail­able so there is no separate labelling for the range selector switch.
For a range 0 V ... 10 V, for example, the limits now become -5 V ... 0 V ... +5 V absolute or 0 V ... ±5 V. Positive values of voltage at the V socket or current at the A socket cause the nee­dle to move to the right while negative values cause it to move to the left. The scales are la­belled accordingly (smaller auxiliary numbering).
5.7 Changing the battery
5.7.1 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 regula­tions (In Germany: BattG; EU: 2006/66/EG).
5.7.2 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 me­chanical clip on the positive side prevents bat­tery contact when polarity is reversed.
Close chassis again.
Fig. 4 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 measure­ment socket.
3B Scientific GmbH Rudorffweg 8 21031 Hamburg Germany www.3bscientific.com
Subject to technical amendments
© Copyright 2013 3B Scientific GmbH
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