September 2017
Intermediate to advanced
700 pages
28h 19m
English
Content preview from Automobile Electrical and Electronic Systems, 5th Edition
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Tools and equipment
75
Figure 2.2 Multimeter and accessories
Figure 2.3 Loading effect of a meter
Meter resistance 10 MΩ
The parallel combined value of 10 MΩ and 100 KΩ = 99 KΩ. The voltage drop
in the circuit across this would be:
99/(100 + 99) x 12 = 5.97 V
This is an error of about 0.5%.
Of course, understanding accuracy is important, but there are two further skills
that are important when using a multimeter: where to put the probes, and what
the reading you get actually means!
Figure 2.4 shows a block diagram of a digital voltmeter. This is very similar to
other types of digital instrumentation systems.
2.1.5 Logic probe
This device is a useful ...
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