Rohde & Schwarz R&S FSH Series - Page 49

R&S FSH Using a Preamplifier
1145.5973.12 1.15 E-11
If the preamplifier is switched on, its use is coupled to the reference level, thus ensuring the optimum
dynamic range of the R&S FSH at all times. The table below shows the positions of the RF attenuator
and the preamplifier as a function of the reference level.
Preamplifier
OFF
Preamplifier
ON
Reference level
RF attenuation RF attenuation Preamplifier
Low Noise Low Distortion Low Noise Low Distortion
-25 dBm
0 dB 0 dB 0 dB 0 dB On
-24 dBm to -20 dBm 0 dB 0 dB 10 dB 10 dB On
-19 dBm to -15 dBm 0 dB 10 dB 10 dB 10 dB On
-14 dBm to -10 dBm 0 dB 10 dB 0 dB 10 dB Off
-9 dBm to 0 dBm 10 dB 20 dB 10 dB 20 dB Off
1 dBm to 10 dBm 20 dB 30 dB 20 dB 30 dB Off
11 dBm to 20 dBm 30 dB 30 dB 30 dB 30 dB Off
The attenuator position can be queried at any time via the status display.