Improving Level Performance
R&S
®
SMA100B
145
User Manual 1178.3834.02 ─ 03
Remote command:
Attenuator Level Range
Shows the interruption-free range of the level that you can use in the currently selected
mode.
Remote command:
:OUTPut<hw>:AFIXed:RANGe:LOWer?
:OUTPut<hw>:AFIXed:RANGe:UPPer?
RF OFF Mode
Determines the state of the attenuator, when the RF signal is switched off.
The value is not affected by an instrument preset (PRESET key or
*RST
) and the
"Save/Recall" function. It is reset only by factory preset.
"Unchanged"
Freezes the setting of the attenuator.
Use this mode if a constant VSWR (Voltage Standing Wave Ratio) is
required.
"Full Attenuation"
Switches to the maximum attenuation.
Use this mode for applications that require a high level of noise sup-
pression.
Remote command:
[:SOURce<hw>]:POWer:ATTenuation:RFOFf:MODE
6.1.2 Reverse Power Protection
The R&S
SMA100B is equipped against overloading by an external signal applied to
the RF output.
The reverse power protection is tripped when the power of signals reflected from the
load or external signals applied to the RF output becomes too high. A relay opens and
interrupts the internal connection to the RF output. This condition is indicated in the
status bar by the "Overload" status message.
Overload
If an "Overload" status message is indicated in the status bar, perform the following:
●
Remove the cause for the overload
●
Press the RF ON/OFF key to reset the overload protection
The RF input is activated when the overload protection is reset.
Remote command:
:OUTPut<hw>:PROTection:TRIPped?
Attenuator
