The R3131 spectrum analyzer is a low-cost, 3-GHz synthesized instrument for wireless applications. It offers a frequency range of 9 kHz to 3 GHz with phase noise lower than -100 dBc/Hz at 20-kHz offset. This level of accuracy, along with one-button automated measurements for adjacent channel power, occupied bandwidth, and average and total power, makes the R3131 well suited for wireless design and troubleshooting uses. The instrument also provides automatic pass/fail limit testing.