Freeware, theres REW and Wavespectra. Help manual is pretty useful for most of the time except in Wavespectra where you mostly just figure it out yourself.
http://efu.jp.net/soft/ws/ws.htmlI use a fluke meter to verify stuff but thats kinda overkill, get a reputable brand true RMS meter if you wanna get decent measurements.
Load is always in parallel which means split adaptors, think of the analyzer as a voltmeter that measures voltage drop across the load. I personally use headphones as loads, but non inductive 33 and 330 ohm resistors are preferred to keep in line with standards.
