Model	Low end frequency limit	High end frequency limit	Gain	Noise Figure
SR554	100.0 mHz	40.0 kHz	x100, x500	1 dB
SR445A	0	350.0 MHz	x5, x25, x125	N/A
SR550	10.0 Hz	100.0 kHz	N/A	N/A
SR552	1000.0 mHz	100.0 kHz	N/A	N/A
SR240A	0	350.0 MHz	5	N/A
SR560	30.0 mHz	1.0 MHz	N/A	N/A