R&S ESU Series Operating Manual page 91

R&S ESU
Preamp - Switching the preamplifier on and off
The preamplifier can be switched on/off separately for each subrange.
Remote command:
Auto Preamp - Activates the auto preamp function
ON
OFF
Remote command:
RF Input - Selects the RF Input
INPUT 1- Input 1 covers the whole frequency range.
INPUT 2 - Input 2 is pulse resistant and is limited to 1 GHz
Remote command:
LN Preamp - Activates Low Noise Preamplifier
Activates or deactivates the low noise preamplifer if option R&S ESU-B24 is
installed.
The low noise 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 intermodula-
tion is increased. This preamplifier covers the range from 100 kHz to the upper limit
frequency. Activating the low noise preamplifier deactivates the standard preampli-
fier.
As of firmware version 4.43 ist is possible to activate the low noise preamplifier in
combination with an active preselector.
Default value is OFF.
Remote command:
ADJUST The ADJUST AXIS softkey automatically sets the limits of the diagram so that the
AXIS lower limit frequency corresponds to the start frequency of range 1 and the upper
limit frequency to the stop frequency of the last range.
Remote command:
INS BEFORE The INS BEFORE RANGE softkey shifts the active scan range in the table to the left
RANGE by one column. A new column with identical settings is created. The limit frequen-
cies can be changed accordingly.
Remote command:
INS AFTER The INS AFTER RANGE softkey shifts the active scan range in the table to the right
RANGE by one column. A new column with identical settings is created. The limit frequen-
cies can be changed accordingly.
Remote command:
4.60
SCAN1:INP:GAIN:STAT OFF
The preamplifier is considered in autoranging. It is only cut in after the
attenuation has been reduced to the minimum settable value.
Auto ranging without preamplification.
SCAN1:INP:GAIN:AUTO OFF
SCAN1:INP:TYP INPUT1
INP:GAIN:LNA:STAT ON | OFF
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Instrument Functions
Receiver Mode
Operating Manual 1302.6163.12 - 03