R&S FSMR, Operating Manual

Page: 213 / 955

R&S FSMR Level Display/RF Input
1166.3363.12 4.7-3 E-2
RF INPUT
AC DC
The RF INPUT AC/DC softkey toggles the RF input of the analyzer between
AC and DC coupling.
Note: The softkey is only available for models 3, 8 and 26.
IEC/IEEE-bus command:
INP:COUP AC
RF ATTEN
MANUAL
The RF ATTEN MANUAL softkey allows the attenuation to be entered
irrespective of the reference level.
The attenuation can be set in 10 dB steps between 0 and 70 dB (in 5 dB
steps between 0 and 75 dB if option
-B25, Electronic Attenuator , is fitted).
The attenuation can be set in 5 dB steps between 0 and 75 dB. Other entries
will be 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.
Note: The 0 dB value can be entered only via the numeric keypad
in
order to protect
the input mixer against overload.
IEC/IEEE-bus command:
INP:ATT 40 DB
RF ATTEN
AUTO
The RF ATTEN AUTO softkey sets the RF attenuation automatically as a
function of the selected reference level.
This ensures that the optimum RF attenuation desired by the user is always
used.
RF ATTEN AUTO is the default setting.
IEC/IEEE-bus command:
INP:ATT:AUTO ON
The MIXER softkey opens a submenu for defining the maximum mixer level
attainable for the selected reference level.
MIXER LVL
AUTO
The MIXER LVL AUTO softkey activates the automatic calculation of the
mixer level dependent on the selected reference level and the selected RF
attenuation.
IEC/IEEE-bus command:
INP:MIX:AUTO ON
MIXER LVL
MANUAL
The MIXER LVL MANUAL softkey allows the maximum mixer level attainable
at the reference level to be entered.
The available range is 0 to -100 dBm in 10 dB steps.
IEC/IEEE-bus command:
INP:MIX -25DBM