Electrical grid testers operate at high-frequency, but are able to cover low-frequency ranges as well. There are two types of grid testers - scalar and vector. First type quantifies amplitude parameters of the grid, while the second type is able to quantify phase properties as well. These gadgets usually comprise a signal creation device, a test set and a receiving device. The signal source creates and sends a signal down the system while test set directs it to a device you wish to test or a part of grid that requires analyzing. Receiver measures the monitored parameters and sends them to a processor to be transformed into information and displayed on the screen.

There is also another network type that is commonly used in modern information transfer system. Optical fiber cables are superior to regular electrical wires for a number of reasons, and are used for information transportation in internet grids, television networks etc. They operate with a different type of signal, and thus need a different type of network analyzers. Though the working principle remains the same, a light source with adjustable wavelength is used as a signal generator.