3B SCIENTIFIC PHYSICS Escola 10 Fiche d'instruction - Page 3

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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 with-

out disconnecting the instrument and using

overload protection without fuses means that

converters may also be connected into the cir-

cuit.

10A

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

as appropri-

mode and select the

as appropri-

mode and select the

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.

10A

Fig. 2 Voltage measurement

5.3 Simultaneous

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, im-

pedance and admittance can all be calculated

forming the appropriate quotients.

10A

Fig. 3 Simultaneous current and voltage measure-

ment

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

mΩ up to several MΩ.

´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 with-

out 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-

current

and

voltage