BW Key - Receiver R&S ESCI
1166.6004.12 4.10 E-2
Preamplifier
equippedR&S ESCI is provided with a switchable preamplifier of 20 dB gain in the frequency range up to
3 GHz.
Switching on the preamplifier reduces the total noise figure of R&S ESCI 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 total noise figure of R&S ESCI is reduced from
approx. 18 dB to approx. 10 dB when a preamplifier is used. The use of the preamplifier is
recommended when measurements with a maximum sensitivity are to be performed. On the other hand,
if the measurement should be performed at maximum dynamic range, the preamplifier should be
switched off.
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.
CONFIGURATION MODE - RECEIVER menu
PREAMP
ON OFF
The PREAMP ON/OFF softkey switches the preamplifier (9 kHz to 3 GHz) on
and off.
Default value is OFF.
IEC/IEEE-bus command :INP:GAIN: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 R&S ESCI 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
measured.
IEC/IEEE-bus command :INP:ATT:PROT ON | OFF
AUTO RANGE
ON OFF
The AUTO RANGE ON/OFF softkey switches the autorange function on and
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.
IEC/IEEE-bus command :INP:ATT:AUTO ON | OFF
AUTOPREAMP
ON OFF
The AUTOPREAMP ON/OFF softkey switches the autopreamp function and
or off.
ON The preamplifier is considered in the autorange procedure. The
preamplifier is cut in when the RF attenuation is reduced to the
minimum settable value.
OFF The preamplifier is not considered in the autorange procedure.
IEC/IEEE-bus command :INP:GAIN:AUTO ON | OFF
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