R&S 1129.7246.03, Operating Manual

Page: 47 / 855

R&S ESU Instrument Functions
Receiver Mode
4.16 Operating Manual 1302.6163.12 - 03
4.5.2 Level Display and RF Input Configuration – AMPT Key
The AMPT key is used to set the input attenuation, the Preamplifier , the auto range
function and the Display Unit .
In addition, the level display range for the scan can be set.
AMPT
*) LN PREAMP ON OFF is only available with option R&S ESU-B24
RF ATTEN
MANUAL
The RF ATTEN MANUAL softkey activates the attenuation entry field.
The attenuation can be set between 0 and 75 dB in 5 dB steps. Other entries are
rounded up to the next higher integer.
Remote command:
INP:ATT 40 DB
Preamplifier
R&S ESU is provided with a switchable preamplifier of 20 dB gain in the frequency
range up to 3.6 GHz. An additional low noise preamplifier which covers the whole
frequency range is available as option R&S ESU-B24.
Switching on the preamplifier reduces the total mark figure of the R&S ESU and thus
improves the sensitivity.
The disadvantage of a poorer large-signal immunity (intermodulation) is reduced by
the connected preselector. The signal level of the subsequent mixer is 20 dB higher
so that the maximum input level is reduced by the gain of the preamplifier. The use
of the preamplifier is recommended when measurements with a maximum sensitiv-
ity are to be performed. On the other hand, if the measurement should be performed
at maximum dynamic range, the preamplifier should be switched off.
RF ATTEN MANUAL
PREAMP ON OFF
LN PREAMP ON OFF
10 DB MIN ON | OFF
AUTO RANGE ON | OFF
AUTOPREAMP ON | OFF
RF INPUT 1 | 2
RF INPUT AC | DC
GRID LEVEL GRID RANGE LOG MANUAL
GRID MIN LEVEL
Side menu
dBmV | dBm | dBmA | dBpW |
dBpT | dBmV | dB*/MHz
To protect the input mixer against inadvertent overload, 0 dB can only be
switched on when the
10 dB MIN softkey is switched off.