R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Instrument Functions
EL ATTEN
MANUAL
EL ATTEN
AUTO
Analyzer Mode
For setting RANGE LINEAR (linear scaling, labelling of axes in %) the softkey is not
displayed since the unit % itself implies a relative scale.
Remote command: DISP:WIND:TRAC:Y:MODE ABS
4.5.3.1 Electronic Attenuator
Besides the mechanical attenuator at the RF input, the R&S FSQ also offers an
electronic attenuation setting (option ELECTRONIC ATTENUATOR R&S FSQ-B25).
The attenuation range is 0 to 30 dB, with the default attenuation being preset by the
mechanical attenuator.
The EL ATTEN MANUAL softkey switches the electronic attenuator on and allows
the attenuation of the electronic attenuator to be set.
The attenuation can be varied in 5 dB steps from 0 to 30 dB. Other entries are
rounded to the next lower integer value.
If the defined reference level cannot be set for the given RF attenuation, the reference
level will be adjusted accordingly and the warning "Limit reached" will be output.
Remote command: INP:EATT:AUTO OFF
INP:EATT 10 DB
This function is only available with option ELECTRONIC ATTENUATOR B25.
The EL ATTEN AUTO softkey switches the electronic attenuator on and automatically
sets its attenuation to 0 dB.
The allowed setting range of the reference level ranges from the current reference
level on switching on the electronic attenuator to over 30 dB. If a reference level is
set outside the allowed 30-dB range, setting is performed by means of the mechanical
attenuator. From this new reference level to over 30 dB the setting is again performed
with the electronic attenuator.
Remote command: INP:EATT:AUTO ON
This function is only available with option ELECTRONIC ATTENUATOR B25.
EL ATTEN OFF The EL ATTEN OFF softkey switches the electronic attenuator off.
RF INPUT
(50Ω 75Ω)
REL The upper line of the grid is always at 0 dB.
The scaling is in dB whereas the reference level is always in the set unit
(dBm, dBmV,..).
Remote command: INP:EATT:STAT OFF
This function is only available with option ELECTRONIC ATTENUATOR B25.
The RF INPUT (50 Ω 75 Ω) softkey switches the input impedance of the instrument
between 50 Ω (= default setting) and 75 Ω.
The setting 75 Ω should be used if the input impedance (50 Ω) is transformed to 75
Ω using the corresponding adapter unit of type RAZ (= 25 Ω in series to the input
impedance of the R&S FSQ). The correction value used for the adoption is 1.76 dB
= 10 log (75Ω / 50Ω).
Operating Manual 1313.9681.12 - 01 4.19