The attenuator mode is set in the Attenuator Settings section.
Sets the attenuator mode at the RF output.
"Auto" | Standard mode. |
"Fixed" | When this operating mode is switched on, the attenuator and the relays are fixed in their current positions to provide level settings without interruption. The resulting variation range is defined and displayed under "Attenuator Fixed Range". Note: The function is effective when automatic level control is activated ("ALC State = On"). If the normal variation range is overranged or underranged, level errors increase considerably and the warning "Level under/overrange" appears in the info line. The spectral purity of the output signal decreases with high attenuation. |
Displays the level range in which the level is set without interruption for the "Attenuator Mode fixed" setting.
Remote command:Selects the attenuator mode, when the RF signal is switched off.
The setting of the RF OFF mode is not affected by an instrument preset (PRESET key), *RST and the "Save/Recall" function. This parameter is influenced only by the "Factory Preset".
"Unchanged" | Freezes the setting of the attenuator when RF is switched off. The attenuator is only activated when RF is switched on. This setting is recommended if a constant VSWR (Voltage Standing Wave Ratio) is required. |
"Full Attenuation" | Sets attenuation to maximum when the RF signal is switched off. This setting is recommended for applications that require a high level of noise suppression. |
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