It's just a signal generator, an AC voltmeter, and a phase meter, gussied up with attenuators and digital displays. They're usually VERY expensive as you want the network analyzer to be perfectly flat in amplitude and phase, which takes a lit of very precise analog electronics and tuning to do.
Two, you should always insert quotation marks at the beginning and at the end of your quote to indicate that the sentence in your paragraph is borrowed from another source. 1  Examples: 2  You may also want to read how to quote in an essay, or how to quote in APA, or how to quote in MLA.
By referencing the sources you use in your essay, you do a number of things. First of all, you comply with an academic convention. Secondly, you make your essay look more professional. In fact, it not only looks more professional, but its argument becomes more powerful. Thirdly, you allow others to check your sources.