Choice: On | Off
Default: On
Double-click or use the drop-down menu to enable or disable the automatic level control.
On – the ALC circuit constantly monitors and controls the output power level.
Off – no automatic leveling occurs.
Choices: Auto, 100 Hz, 1 kHz, 10 kHz, 100 kHz
Default: Auto
Select the ALC loop bandwidth from the drop-down list. Choose Auto to let the instrument automatically select the optimized bandwidth for the current signal setup.
For waveforms with varying amplitudes, a high crest factor, or both, set the ALC loop bandwidth to 100 Hz, which is the default bandwidth set when an ARB format is turned on. Limiting the loop bandwidth of the ALC circuit prevents the ALC from sampling the fast rising edges of high-crest pulsed waveforms.
This parameter is not available with all instrument model numbers and may be grayed out.
Choice: Modulation | Fixed | RMS
Default: Modulation
Set to to enable this parameter.
Double-click or use the drop-down menu to select a fixed or modulation reference signal when doing a power search.
Fixed – power search uses a fixed 0.5 V reference.
Modulation – power search uses the RMS value of the current I/Q modulation as the reference.
RMS – power search uses the RMS voltage level stored in the waveform header as the reference. Signal Studio calculates this RMS value based on the relative power level of the symbol(s) chosen as the power reference (by default, the preamble)
Choice: Normal | Minimum
Default: Normal
Set to to enable this parameter.
Double-click or use the drop-down menu to select the level of the output power control during a power search routine.
Normal – performs power searches without setting the internal step attenuator to its maximum setting. Glitches and power changes may be present during the search.
Minimum – sets the instrument's step attenuator to its maximum setting during power search to protect sensitive circuits.