User manual

Perform this measurement with the second resistor, where you originally measured
"1" for 1 kΩ as well. You will find that it actually has about 326 Ω. Therefore,
this is the 330-Ω resistor.
For the third, the 2.2 MΩ resistor, you will see "1—" for any measuring range
set. This shows that the multimeter is not suitable for measuring very high
resistors. When selecting the right multimeter, consider what you want to do
with it.
A measurement is only precise when the measuring range is utilised as well as
possible. Therefore, you should always switch to the smallest possible area. The
larger the selected measured range, the larger the measuring error and the less
precise the measurement. This also applies regarding current and voltage
measurements.
Figure 26: In the 2,000
Ω measuring range, a impedance value of 983 Ω is
measured. Therefore, the best measuring range for this resistor has been found.
Figure 27: If measured correctly, the second resistor originally measured as 1
k
Ω turns out to be a 330 Ω resistor
How do Resistors Switched in Series Behave?
Resistors are installed in circuits not only individually but also in
combination. One possibility is switching resistors in series.
For this, plug two 1 kΩ resistors into the experimenting field in series.
Now connect a measuring string to the left end of the left resistor and the
second one to the right end of the right resistor and determine the impedance.
In our test setup, you will find about 1,970 Ω, i.e. approximately 2 kΩ. When
switching several resistors in series, the overall impedance that you have now
also measured equals the sum of the individual resistors. Therefore:
R
ges
= R1 + R2 + … Rn
2 kΩ = 1 kΩ + 1 k
Ω.
Also try switching in series with several and different resistors. This way, you
can build any resistor that you have no single component at hand for currently.
Figure 28: Two resistors in series;
to determine the overall impedance, connect one measuring line to the left
connection of the left resistor, the other to the right connection of the right
resistor.
Figure 29: Two resistors switched in series.
Figure 30: The overall impedance for resistors switched in series always
corresponds to the total of the individual impedance values.
How do Resistors Switched in Parallel Behave?