Digital electronic instruments measure many parameters and can be used where a wattmeter is needed : volts, current, in amperes, apparent instantaneous power, actual power, power factor, energy in [ k ] W�h over a period of time, and cost of electricity consumed.
32.
The ammeter and voltmeter are both vulnerable to overheating in case of an overload, their pointers will be driven off scale but in the wattmeter, either or even both the current and potential circuits can overheat " without " the pointer approaching the end of the scale.
33.
Its products include accessories and connectors, antennas, attenuators, cavity filters, combining systems, components, duplexers and triplexers, laboratory grade instruments, plug-in elements, power measurement products, preselectors, spectrum analyzers, vector network analyzers, signal boosters, terminations and loads, test equipment, tower top amplifiers, receiver multicouplers, and wattmeters and line sections.
