R&S ESU Series Operating Manual page 568

R&S ESU
6.12 INPut Subsystem
The INPut subsystem controls the input characteristics of the RF inputs of the instrument. In receiver
mode, the suffix is irrelevant. In analyzer mode, the measurement windows are assigned to INPut1
(screen A) and INPut2 (screen B).
INPut<1|2>:ATTenuation 0 to 75 dB
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.
In receiver mode, if the attenuation is programmed directly, the auto range function is switched off if
necessary. Setting 0 dB can be prevented by activating the protection function (INPut:
ATTenuation:PROTection ON).
Example:
"INP:ATT 40dB"
Analyzer: 'Sets the attenuation on the attenuator to 40 dB and switches off the
coupling to the reference level.
Receiver: 'Sets the attenuation on the attenuator to 40 dB and switches off the auto
ranging.
Characteristics: *RST value: 10 dB (AUTO is set to ON)
SCPI: conform
Mode: R, A
INPut<1|2>:ATTenuation:AUTO ON | OFF
In analyzer mode, 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.
In receiver mode, this command automatically sets the attenuation so that a good S/N ratio is obtained
without the receiver stages being overdriven (state ON).
Example:
"INP:ATT:AUTO ON"
'Switches the auto ranging function on.
Characteristics: *RST value: ON
SCPI: conform
Mode: R, A
INPut<1|2>:ATTenuation:PROTection[:STATe] ON | OFF
This command defines whether the 0 dB position of the attenuator is to be used in manual or automatic
adjustment.
Example:
"INP:ATT:PROT ON"
Characteristics: *RST value: OFF
SCPI: device-specific
Mode: R
Operating Manual 1302.6163.12 - 03
Remote Control – Description of Commands
INPut Subsystem
6.129