Multimeter & Oscilloscopes

Digital Multimeter

A Digital Multimeter (DMM) is made up of an electronic testing circuit and a liquid crystal display screen (LCD).

In spite of its lower data display speed, it can incorporate safety systems to protect the device against reverses of polarity or measurements on unsuitable scales. A digital multimeter with the highest possible impedance should be used so it affects the electrical circuit under test as little as possible and does not damage it. Some Digital Multimeters have an “Auto-Range” function, these type of DMM will automatically set the range to suit the circuit being tested.