R&S 1129.7246.03, Operating Manual

Page: 49 / 855

R&S ESU Instrument Functions
Receiver Mode
4.18 Operating Manual 1302.6163.12 - 03
modulation is increased. This preamplifier covers the range from 100 kHz to the
upper limit frequency. Activating the low noise preamplifier deactivates the standard
preamplifier.
As of firmware version 4.43 ist is possible to activate the low noise preamplifier in
combination with an active preselector.
The softkey is available with option R&S ESU-B24.
Default value is OFF.
Remote command:
:INP:GAIN:LNA:STAT ON | OFF
10 DB MIN
ON | OFF The 10 DB MIN softkey determines whether the 10 dB setting of the attenuator may
be used in the manual or automatic setting of the attenuator.
10 DB MIN ON is the default value, i.e. an RF attenuation of at least 10 dB is always
set on the R&S ESU to protect the input mixer.
An attenuation of 0 dB cannot be set manually either. This avoids 0 dB being
switched on inadvertently, particularly when DUTs with high RFI voltage are mea-
sured.
Remote command:
INP:ATT:PROT ON | OFF
AUTO RANGE
ON | OFF The AUTO RANGE ON/OFF softkey switches the autorange function on and off.
.
Remote command:
INP:ATT:AUTO ON | OFF
AUTOPREAMP
ON | OFF
The AUTOPREAMP ON/OFF softkey switches the auto preamp function and or off.
.
Remote command:
INP:GAIN:AUTO ON | OFF
ON The attenuation is automatically set so that a good S/N ratio is
obtained without the receiver stages being overdriven.
OFF The attenuation is set manually.
Depending on the characteristics of the RF signal, the receiver may not utilize the
maximum possible dynamic range. Measurement results are still valid, however,
because it is ensured that performing measurements does not result in an over-
load.
ON The preamplifier is considered in the autorange procedure. The pream-
plifier is cut in when the RF attenuation is reduced to the minimum set-
table value.
OFF The preamplifier is not considered in the autorange procedure.