Active power is the power to make the machine working, in another word, the electric power to transfer electric energy to other mode energy, such as mechanical energy, optical energy, heat energy, etc.

Multimeters are one of the necessary instruments for hardware engineers, they can measure voltage, current, resistance, capacitance, diode, etc.

Nowadays many brands of rf signal generator are existing in the market, it will make double results with half work by selecting a suitable product in your test and measuring work.

What's a frequency counter? It is an electronic test instrument especially made for signal frequency measuring and is mainly composed of a time base circuit, input circuit, frequency display circuit and control circuit.

Digital multimeters are electronic test instruments with versatile usage, forms and types which may be more than other kinds of instruments.