The Advantest R4131A is a 10KHz to 3.5 GHz Spectrum analyzer. The R4131 Series incorporates the performance of the already-popular TR4131 Series of 3.5 GHz spectrum analyzers and provides additional features as well. Weighing just 10 kg (22 lbs), these analyzers have a measurement-condition memory function which includes waveforms, an auto-recall function which recalls measurement conditions when power is switched on and other features to simplify operations.
