A digital multimeter is a single instrument that is capable of measuring voltage, current and resistance. A digital multimeter is an indispensable general-purpose tool for troubleshooting electrical problems. There are other dedicated test instruments, which in various ways, go beyond the capabilities of the multimeter.
This module describes the typical features and usage of digital multimeters, as well as those of voltage detectors, clamp ammeters, megohmeters, digital thermometers and oscilloscopes.
Learning Objectives
- List precautions to be taken when making electrical measurements
- Describe a digital multimeter
- List what can be measured with a multimeter
- Describe how voltage, current and resistance are measured
- Describe the advantages of a voltage detector
- Describe a clamp ammeter
- Describe what is unique about a megohmmeter
- Describe how an oscilloscope can be used