The spectrum analyzer R&S FSL leads its class with respect to its large number of standard functions. 

• Tracking generator for directional power measurements with Model .13
• Full choice of detectors: max, min, auto-peak, sample, RMS, average, quasi-peak 
• CP/ACP/fast ACP measurement functions with a host of predefined standards (see ACP screenshot) 
• Time domain power measurement 
• Measurement of carrier-to-noise ratio C/N or C/N0 referenced to 1 Hz or channel bandwidth 
• CCDF: measurement of crest factor and amplitude probability function 
• Automatic test routines for: - Occupied bandwidth (OBW) - Third order intercept point (TOI) - AM modulation depth 
• Adjustable number of trace points, max. 32001 
• Editable limit lines including PASS/FAIL indication 
• Level units: - dBm, dB?V, dBmV, dB?A, dBpW, V, W, A 
• Frequency counter featuring resolution of 1 Hz with measurement time of 50 ms 
• Phase noise and noise marker with dBm/Hz and dBc/Hz results 
• n-dB down functionality for fast determination of bandwidth 
• Channel filters, shape factor <2 
• EMI filters: 200 Hz (optional), 9kHz, 120 kHz 
• FFT filters from 300 Hz to 30 kHz, optional 1Hz to 30 kHz 
• WLAN option for TX measurements on 802.11a, b, g, j signals
• Firmware option for measurements on Bluetooth transmitters, including EDR
• USB interface
• Tracking generator (Freq. 1 MHz to 6 GHz; output -20 dBm to 0 dBm)