The Rohde and Schwarz FSP3 Spectrum Analyzer is capable of testing spurious emissions stipulated in the GSM specifications and has a firmware to allow adjacent-channel power (ACP) measurement to the W-CDMA/third-generation partnership project (3GPP). This measurement is implemented in the FSP3 by automatic test routines which make all necessary settings, measurements and filtering. The electronic attenuator for a spectrum analyzer increases the availability for use in production and allows a number of switching operations in a wear-and-tear-free setting range of 30 dB in 5 dB steps.