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.
(M9381A only)
Choice: AUTO | PXI0 | ... | PXI7
Default: AUTO
Double-click or use the drop-down menu to select a bus for ALC hold signal path on PXI backplane.
(M9381A only)
Choice: Off | Track on Marker | Hold on Marker
Default: Track on Marker
Double-click or use the drop-down menu to select how the ALC circuit in the output module functions when the ALC is enabled. ▪ Off − ALC hold is turned off. ▪ Track on Marker − When playing a waveform file and a Marker is crossed in the waveform file, the ALC will track on the Marker. ▪ Hold on Marker − When playing a waveform file and a Marker is crossed in the waveform file, the ALC will hold on that Marker.
Choices: Auto | 200 Hz | 2 kHz | 20 kHz
Default: Auto
Double-click or use the drop-down menu to select the ALC loop bandwidth. Choose Auto to let the signal generator automatically select the optimized bandwidth for the current signal setup.
This parameter is not available for all instrument model numbers and may be grayed out.
Choice: RMS | Fixed | Manual | Modulated
Default: RMS
Double-click or use the drop-down menu to select a fixed or modulation reference signal when doing a power search.
RMS − power search uses DC bias that is equivalent to the value derived from the file header or the calculated value from the current I/Q data.
Fixed − power search uses a fixed DC bias value.
Manual− power search allows the user to specify the DC bias voltage.
Modulated − power search uses the AC bias from the actual modulating signal.
Set ALC to Off to enable this parameter.
Choice: Normal | Minimum
Default: Normal
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 signal generator's step attenuator to its maximum setting during power search to protect sensitive circuits.
Set ALC to Off to enable this parameter.