Model	Low end frequency limit	High end frequency limit	Resolution Bandwidth Min.	Resolution Bandwidth Max.	Amplitude Range
R&S FSU26	20 Hz	27 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSU3	20 Hz	4 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSU50	20 Hz	50 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSQ8	20 Hz	8 GHz	1000 mHz	10 MHz	DANL with preamplifier < -152 dBm (10Hz)
R&S FSU46	20 Hz	46 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSU8	20 Hz	8 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSQ40	20 Hz	40 GHz	1000 mHz	10 MHz	DANL with preamplifier < -152 dBm (10Hz)
R&S FSP40	20 Hz	40 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSQ3	20 Hz	4 GHz	1000 mHz	10 MHz	DANL with preamplifier < -152 dBm (10Hz)
R&S FSQ26	20 Hz	27 GHz	1000 mHz	10 MHz	DANL with preamplifier < -152 dBm (10Hz)
R&S FSP7	20 Hz	7 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSP30	20 Hz	31 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSP13	20 Hz	13 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)
R&S FSH6	100 kHz	6 GHz	1 kHz	1 MHz	Average noise level displayed to +20 dBm
R&S FSH3	100 kHz	3 GHz	1 kHz	1 MHz	average noise level displayed to +20 dBm
R&S FS300	9 kHz	3 GHz	200 Hz	1 MHz	Displayed average noise level <–110 dBm, typ. –120 dBm (300 Hz)
R&S FSP3	20 Hz	3 GHz	1000 mHz	10 MHz	Displayed average noise level -155 dBm (1 Hz)