An essential tool for working on vehicle electrical and electronic systems is a
good digital multimeter (often referred to as a DMM). Digital meters are most
suitable for accuracy of reading as well as available facilities.
The following list of functions broadly in order, starting from essential to
desirable should be considered:
Denition
DMM: Digital multimeter.
Table 2.3 Multimeter functions
FunctionRangeAccuracy
DC voltage500 V0.3%
DC current10 A1.0%
Resistance
0 to 10 MW
0.5%
AC voltage500 V2.5%
AC current10 A2.5%
Dwell3,4,5,6,8 cylinders2.0%
rpm10,000 rpm0.2%
Duty cycle% on/off0.2%/kHz
Frequency ...
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