3B SCIENTIFIC PHYSICS Escola 2 1006811 Lembar Instruksi - Halaman 4
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Halaman Cetak5.2 Measurements with the zero position of
the needle centred
This mode of measurement only works for the
DC current and DC voltage ranges.
For measurements requiring the zero posi-
•
tion of the needle position to be centred, set
the operating mode switch to the position
.
Before connecting the external quantity to be
•
measured, use the adjustment knob to accu-
rately centre the zero position on the scale.
5.3 Selecting measuring range
Initially set the range selection switch to the
•
largest possible range, then work down to
lower ranges until the optimum deflection of
the needle is reached.
Once all measurements have been com-
•
pleted, turn the selector switch back to the
maximum range again.
5.4 Calibrating zero-point
Turn on the multimeter, set the maximum
•
voltage range of 30 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.
5.5 Switching off
Always set the measuring mode to
•
completion of measurements to avoid un-
necessary use of the battery.
6. Maintenance
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. 1 Changing the battery
Do not dispose of the
•
battery
household refuse. Fol-
after
low the local regula-
tions
(In
BattG;
2006/66/EG).
6.2 Cleaning
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.
4
in
regular
Germany:
EU: