3B SCIENTIFIC PHYSICS Escola 10 Foglio di istruzioni - Pagina 4

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5.1 Current measurement

The nominal voltage of the voltage

source may not exceed 600 V. Do not

make measurements in the low-voltage

mains region.

The multimeter is to be connected in series with

the load on the side where the voltage with re-

spect to ground is lowest.

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

The nominal voltage of the voltage

source may not exceed 600 V. Do not

make measurements in the low-voltage

mains region.

Before making any voltage measurements, set

•

the mode switch to

ate.

Use the "V" socket on the right for voltage

•

measurements.

as appropri-

mode and select the

as appropri-

Set the switch to

•

desired measuring range. lf the voltage to be

measured is unknown beforehand, set 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 Measuring current and voltage without

reconnecting

Isolated current and voltage sockets allow

measurements 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 = V/I, or conductance G = I/V, 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 under 1

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.

mode and select the