| Model | R&S®FSL3
model .03 | R&S®FSL3
model .13 | 
| Frequency range | 9 kHz to 3 GHz | 9 kHz to 3 GHz | 
| Frequency accuracy | 1 × 10-6 | 1 × 10-6 | 
| With R&S®FSL-B4, OCXO | 1 × 10-7 | 1 × 10-7 | 
| Resolution bandwidths | 
| Standard | 300 Hz to 10 MHz in 1/3 sequence, zero span additionally 20 MHz | 
| With R&S®FSL-B7 | 10 Hz to 10 MHz in 1/3 sequence, additionally 1 Hz (FFT filter) | 
| Video bandwidths | 10 Hz to 10 MHz | 10 Hz to 10 MHz | 
| Signal analysis bandwidth | 28 MHz | 28 MHz | 
| Phase noise | typ. -103 dBc (1 Hz) at 10 kHz from carrier, 1 GHz | 
| Displayed average noise level (DANL) | 
| With 300 Hz RBW | typ. -117 dBm | typ. -117 dBm | 
| With 1 Hz FFT RBW and preamplifier
(R&S®FSL-B7, R&S®FSL-B22 options) | 500 MHz: typ. -162 dBm
3 GHz: typ. -158 dBm | 
| Third-order intercept (TOI) | typ. +18 dBm | typ. +18 dBm | 
| Detectors | pos./neg. peak, auto peak, RMS, quasi-peak, average, sample | 
| Level measurement uncertainty | <0.5 dB (30 kHz ‰¤ f ‰¤ 3 GHz),
<0.8 dB (3 GHz< f ‰¤ 6 GHz),
<1.2 dB (6 GHz< f ‰¤ 18 GHz) | 
| Tracking generator | no | yes | 
| Frequency range | - | 1 MHz to 3 GHz | 
| Output level | - | -20 dBm to 0 dBm |