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Fixed Gain
In the fixed gain mode, the ALC is disabled. The RF
Level DAC and step attenuator (if installed) are
used to control the relative power level. Power is not
detected at any point, and the absolute power level
is uncalibrated. Fixed gain mode is selected from the
leveling menu.
To select fixed gain mode, access the Leveling menu,
then press Fixed Gain [LV0]. After fixed gain mode
selected, the attenuator (if installed) is decoupled
and the RF Level DAC value is displayed as shown
below:
The level indicator will also show the unleveled con-
dition. The RF Level DAC adjustable range is from 0
to 16383.
Press < Previous to return to the ALC Mode menu
display or press Internal to return to normal ALC
operation.
Auto Fixed Gain
In auto fixed gain mode, the ALC is enabled for the
initial power sweep, frequency sweep, or CW
frequency setting to obtain a sample of the RF Level
DAC voltages. After the DAC voltages are sampled,
the ALC is disabled and the sampled RF Level DAC
voltages are applied for all subsequent operation. If
a frequency or level parameter is changed, the ALC
will again sample the RF Level DAC voltages and
apply them to the new settings.
To select auto fixed gain mode, access the Leveling
menu, then press Auto Fixed Gain [LV1].
Press < Previous to return to the ALC Mode menu
display or press Internal to return to normal ALC
operation.
3-66 MG369XB OM
Leveling Operations Local (Front Panel) Operation