3B SCIENTIFIC PHYSICS Escola 10 Instruction Sheet - Page 5
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Print Page5.5 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: