Resistors Measurement

Measurement the electrical
resistance of a carbon film
resistor

Profesor:
Per Ulrik Hansen



Table of Contents
1.

Problem definition..................................................................................................... 2

2.

Experiment preparation ............................................................................................. 2

3.Experimental results .................................................................................................. 4

4.

Results analysis......................................................................................................... 5

5.

Results explanations .................................................................................................. 6

6.Conclusion................................................................................................................. 9

1


1. Problem definition.

Everyone who have work with electronic componentsknow that a constant resistor,
in this case a carbon film resistor, have a certain range of accuracy, but is really
difficult to find a resistor that have exactly the same resistance as manufacturersays.
I am going to analyze 30 carbon film resistors of 1kohm and a manufacturing
tolerance of 5% (as cover page). I will take in account the possible multimeter error
and the temperaturecoefficient of the resistors.
I will measure the resistance at 3 different temp eratures in order to obtain the
temperature coefficient of these resistors.

2. Experiment preparation
I’m going to measurethe resistance of each resistor with a digital multimeter.

2



In order to do this experiment I measure the resistance at approximate ly 16.9ºC
(temperature of the room),

After that I putthe resistors in the refrigerator for 30 min, at 3.6ºC,

Finally I put in a glass of water at 38.8 ºC

3



3. Experimental results
Measurement at room temperature 16.9ºC, was quite simple,...