R&S ESU Series Operating Manual page 48

R&S ESU
The gain of the preamplifier is automatically considered in the level display. The
preamplifier follows the preselection filters so that the risk of overdriving by strong
out-of-band signals is reduced to a minimum.
Fig. 4.16 Location of the low noise preamplifier R&S ESU-B24 between RF attenuator and the
PREAMP ON The PREAMP ON/OFF softkey Switches the standard preamplifier on and off. The
OFF
range is 1 kHz to 3.6 GHz for the standard preamplifier and the optional low noise
preamplifier for the range from 3.6 GHz to upper limit frequency of the R&S ESU on
and off. When the standard preamplifier is switched on, the disadvantage of a
reduced large-signal immunity (intermodulation) is decreased by the connected pre-
selector: The standard preamplifier follows the preselection filters so that the risk of
overdriving by strong out-of-band signals is reduced to a minimum.
With option R&S ESU-B24 the frequency range of the preamplifier is extended to
the upper frequency limit of the instrument. The frequency range up to 3.6 GHz is
covered by the preamplifier in the preselector, the range above by the low noise
preamplifier R&S ESU-B24.
The softkey is available only in the analyzer mode when the measurement with pre-
selection is activated.
Default value is OFF.
Remote command:
LN PREAMP The LN PREAMP ON/OFF softkey switches the low noise preamplifier on and off.
ON OFF Switching on this preamplifier provides the maximum sensitivity of the R&S ESU.
Since the low noise preamplifier is in front of the preselection filters the risk of inter-
Operating Manual 1302.6163.12 - 03
preselection
INP:GAIN:STAT ON | OFF
Instrument Functions
Receiver Mode
4.17