User manual

Figure 37: Make sure that the polarity of the two capacitators is correct when
installing the two electrolytic capacitators. The measuring lines must be
connected with the correct polarity as well.
Figure 38: When two 10-μF capacitators are switched in series, you will measure
half of the individual capacity of a capacitator.
Capacitators switched in parallel
In the exercise "How do Resistors Switched in Parallel Behave?", you found that
the overall impedance of the resistors switched in parallel is less than the
smallest individual resistor.
Switch two capacitators in parallel on the experimenting board (e.g. with a
capacity of 10 µF each). Check that the two capacitators are installed in the
correct polarity. For electrolyte capacitators, connect the plus connection
wires and the minus connection wires.
Since capacitators are measured alone (without consumer and power source), you
may already connect the red string of the multimeter to the plus and the black
string to the minus connections of the capacitators.
Now switch the multimeter to capacity measurement and wait for a few seconds
until the measured value no longer changes. You will now measure about 23.2 µF,
i.e. twice that of the two 10 µF capacitators.
If follows: When capacitators are switched in parallel, the overall capacity
corresponds to the total of the individual capacities.
The overall capacity of capacitator switched in parallel can be calculated
according to the following formula:
C
ges
= C1 + C2 + … Cn
Figure 39: Circuit setup to measure two capacitators switched in parallel.
Figure 40: Make sure that the polarity of the two electrolytic capacitators
switched in parallel is correct. The measuring lines must be connected with the
correct polarity as well.
Figure 41: When two 10-μF capacitators are switched in capacitator, you will
measure twice of the individual capacity of each capacitator.
How to Measure Direct Voltages?
First build a simple LED circuit on the experimenting board. For this, switch a
1 kΩ resistor in series with an LED. Install a wire bridge to return from the
LED to the minus pole of the battery.
To measure direct current,s the multimeter must be switched into the direct
voltage area. Voltages can be measured either right at the battery by connecting
the red string to the plus and the black one to the minus pole. Since the
multimeter for voltage measurements has a very high internal impedance, nearly
no current will flow, so that the battery is not discharged.