3B SCIENTIFIC PHYSICS Escola 10 Bedienungsanleitung Seite 8

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).
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.
Subject to technical amendments
© Copyright 2013 3B Scientific GmbH
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 me-
chanical clip on the positive side prevents bat-
tery 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 measure-
ment socket.