ABSTRACT
The physical phenomenon is converted on a corresponding electrical signal variation. Then, a computer program will have a code to either control equipment or to provide graphical user information for humans who are using the equipment. A typical challenge in instrumentation is to decouple the electrical signal variation related to the physical phenomenon from the variation caused by its display. An electronic multimeter should be able to read at least voltage and current, direct or alternating, and resistance. The development of power sources and adapters feeding measurement instruments is critical because they are responsible for reading errors and many unwanted noises. Digital network analyzers, wattmeters, varmeters, and energy meters are devices that interpret the interaction between voltage and current to express, respectively, active power, reactive power, and the amount of energy in an electrical circuit.
