3B SCIENTIFIC PHYSICS Escola 10 Instruction Sheet - Page 5

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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-
ing the definitions for impedance Z = V/I and
admittance Y = I/V 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 Calibrating zero-point
Turn on the multimeter, set the maximum
voltage range of 600 V and connect the
ground socket to the voltage socket using a
short lead.
Set up the multimeter in a horizontal position
and correct the zero-point of the dial with the
help of the adjustment knob.
5.8 Switching off
Always set the measuring mode to
completion of measurements to avoid un-
necessary use of the battery.
6.1 Changing the battery
All measuring leads must be discon-
nected from the multimeter before the
casing is opened.
From time to time, check the state of the
battery (see 5. Operation).
Remove discharged or corroded batter-
ies from the multimeter.
During prolonged periods of disuse,
also remove the battery from the mul-
timeter.
Unscrew the back of the casing.
Replace flat batteries with 1.5-V alkaline
batteries of size AA IEC LR6.
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 casing again.
Fig. 4 Changing the battery
after
Do not dispose of the
battery
household refuse. Fol-
low the local regula-
tions
(In
BattG;
2006/66/EG).
5
6. Maintenance
in
regular
Germany:
EU: