Agilent N5181A/82A MXG Signal Generators User’s Guide 47
Optimizing Performance
Using Unleveled Operating Modes
Using Unleveled Operating Modes
Figure4-2 Power Search and ALC Off Softkeys
ALC Off Mode
Turning ALC off deactivates the signal generator’s automatic leveling 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 ALC off is useful when the modulation consists of very narrow pulses
that are below the pulse width specification of the ALC, or when the modulation consists of slow
amplitude variations that the automatic leveling would remove.
1. Preset the signal generator.
2. Set the desired frequency.
3. Set the desired amplitude.
4. Connect the power meter to the point at which you want a specific power level.
5. Turn the RF output on.
6. Deactivate the signal generator’s automatic leveling control: Press AMPTD > ALC Off On to
highlight Off.
7. Adjust the signal generator’s amplitude until the power meter measures the desired level.
Available only when
ALC = Off
Available only when
Power Search = Span
Available only when
Power Search = Span,
and
Span Type = User
Auto: The calibration routine executes whenever
output frequency or amplitude changes.
Span: Pressing Do Power Search executes the
power search calibration routine once over a
selected frequency range.
The corrections are stored and used whenever you
tune the signal generator to within the calibrated
frequency range.
For details on each key, use key help
as described on see page 23.
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