1141
Source (Internal)
Amptd Offset
Allows you to specify the RF output power offset value.
When the amplitude offset is set to zero (0) and you set a new offset value (positive or negative), the
displayed amplitude value will change as follows and the RF output power will not change:
Displayed value = output power + offset value
Where:
output power equals the original RF Power entered under Source>Amplitude>RF Power
offset value equals the value entered under Source>Amplitude>Amptd Offset
When the amplitude offset is set to a value other than zero (0) and you enter a new RF power value under
Source>Amplitude>RF Power, the displayed power will be the same as the value entered and the RF
output power will be equal to the value entered minus the offset value as follows:
Output power = entered power – offset power
Displayed Power = output power + offset power
Displayed power = entered power
Where:
entered power equals the amplitude entered under Source>Amplitude>RF Power
offset power equals the value previously entered and set under Source>Amplitude>Amptd Offset
ALC
Allows you to enable or disable the automatic leveling control (ALC) circuit.
The purpose of the ALC circuit is to hold output power at a desired level by adjusting the source’s power
circuits to compensate for power drift. Power drift occurs over time and changes in temperature.
Turning the ALC off disables the ALC circuitry, enabling you to measure the output at a specific point in
a test setup and adjust as required for the desired power level at that point. Turning the ALC off is useful
when the modulation consists of very narrow pulses that are below the pulse width specification of the
Key Path: Source, Amplitude
Remote Command: :SOURce:POWer[:LEVel][:IMMediate]:OFFSet <rel_ampl>
:SOURce:POWer[:LEVel][:IMMediate]:OFFSet?
Example: SOUR:POW:OFFS 0.00 dB
Dependencies: This setting is unavailable, and is grayed out when the List Sequencer is
turned ON.
Preset: 0.00 dB
Min: –200.00 dB
Max: 200.00 dB
Initial S/W Revision: A.05.00