R&S FSQ Signal Analyzer - Rohde & Schwarz

R&S FSQ Remote Control – Description of Commands
6.12 INPut Subsystem
INPut Subsystem
The INPut subsystem controls the input characteristics of the RF inputs of the instrument. The measurement
windows are assigned to INPut1 (screen A) and INPut2 (screen B).
INPut:ATTenuation 0 to 75dB
This command programs the input attenuator. To protect the input mixer against damage from
overloads, the setting 0 dB can be obtained by entering numerals, not by using the command DEC.
The step width is 5 dB, the range is 0 dB to..75 dB.
In analyzer mode, the attenuation set on the step attenuator is coupled to the reference level of the
instrument. If the attenuation is programmed directly, the coupling to the reference level is switched off.
Example: "INP:ATT 40dB"
'Sets the attenuation on the attenuator to 40 dB and switches off the coupling to the
reference level.
Characteristics: *RST value: 10 dB (AUTO is set to ON)
SCPI: conform
Mode: A
INPut:ATTenuation:AUTO ON | OFF
This command automatically couples the input attenuation to the reference level (state ON) or
switches the input attenuation to manual entry (state OFF). The minimum input attenuation set with the
coupling switched on is 10 dB (with electronic attenuator option: 5 dB).
Example: "INP:ATT:AUTO ON"
'Couples the attenuation set on the attenuator to the reference level.
Characteristics: *RST value: ON
SCPI: conform
Mode: A
INPut:ATTenuation:PROTection:RESet
The R&S FSQ is equipped with an overload protection mechanism. This mechanism becomes active
as soon as the power at the input mixer exceeds a value of 27 dBm. It ensures that the connection
between RF input and input mixer is cut off.
The command resets the attenuator into the state that it had before the overload condition was
detected. It re-connects the RF input with the input mixer.
Example: "INP:ATT:PROT:RES"
Characteristics: *RST value: --
SCPI: device-specific
Mode: A
This command comes into effect only if the reason for the overload condition has
been eliminated. Otherwise the connection between RF input and input mixer is
left open.
This command is an event and therefore has no query and no *RST value.
6.124 Operating Manual 1313.9681.12 - 01