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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 low-

frequency 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 avail-

able 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 nee-

dle to move to the right while negative values

cause it to move to the left. The scales are la-

belled 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 regula-

tions (In Germany: BattG; EU: 2006/66/EG).

3B Scientific GmbH ▪ Rudorffweg 8 ▪ 21031 Hamburg ▪ Germany ▪ www.3bscientific.com

5.7.2 Changing the battery

•

The polarity is also marked on the board with

plus and minus symbols. Additionally, a me-

chanical clip on the positive side prevents bat-

tery contact when polarity is reversed.

•

Fig. 4 Changing the battery

•

Dirt or moisture in the measurement sockets can

affect readings.

•

Subject to technical amendments

Unscrew the back of the chassis.

Place the negative pole of the battery on the

spring.

Close chassis again.

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.

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 measure-

ment socket.