R&S SMJ100A, Руководство по эксплуатации

Страница: 234 / 874

Instrument Function
R&S
®
SMJ100A
218 Operating Manual 1403.7458.32 ─ 14
Remote command:
[:SOURce<hw>]:POWer:POWer
on page 768
Note: The SCPI command
[:SOURce<hw>]:POWer[:LEVel][:IMMediate][:
AMPLitude]
sets the level of the "Level" display, that is the level containing offset.
Limit - RF Level
Sets an upper limit for the RF output power.
You can use it to protect your DUT from damage due to high input power. If you enter
an RF level above this value, the instrument limits the output power to this specified
value, and generates a warning message.
However, the level indication in the status bar is not affected.
Note: The value is not affected by an instrument preset (PRESET key),
*RST
and the
"Save/Recall" function. It is influenced only by the Factory Preset and the factory value
is equal to maximum level.
Remote command:
[:SOURce<hw>]:POWer:LIMit[:AMPLitude]
on page 766
Offset (Level)
Sets the level offset relative to the RF level.
The level offset of a downstream instrument (for example an attenuator or amplifier) is
entered.
The entry does not change the value of the RF level at the RF output. It only changes
the RF level displayed in the display header. The value of the RF level in the header
corresponds to the level at the output of the downstream instrument.
Remote command:
[:SOURce<hw>]:POWer[:LEVel][:IMMediate]:OFFSet
on page 765
Attenuator Settings
The attenuator mode is set in the Attenuator Settings section.
Attenuator Mode
Sets the attenuator mode at the RF output.
"Auto" Standard mode.
The electronically switching attenuator switches with a 5 dB step
width at fixed switching points.
"Fixed" The level settings are made without switching the attenuator.
When this operating mode is switched on, the attenuator and the
relays are fixed in their current positions to provide level settings with-
out interruption. The resulting variation range is defined and dis-
played under "Attenuator Fixed Range".
Note: The function is effective when automatic level control is activa-
ted ("ALC State = On").
If the normal variation range is overranged or underranged, level
errors increase considerably and the warning "Level under/over-
range" appears in the info line. The spectral purity of the output signal
decreases with high attenuation.
RF Signal and Analog Modulations - RF Block