User`s guide

Agilent N5161A/62A/81A/82A/83A MXG Signal Generators User’s Guide 113
Optimizing Performance
Using an Output Offset, Reference, or Multiplier
Power Search Settings
For the power search routine to execute, the instrument must be in the following conditions:
• The I/Q modulation enabled On.
• The RF output enabled On.
• The Automatic Leveling Circuitry deactivated (Off).
• The RF Blanking set to On.
This function prevents power spikes during the power search (refer to “Using the RF Blanking
Marker Function” on page 168.)
• When using summing for the internal Arb and the external I/Q, all four power reference modes
are available (e.g. Fixed, RMS, Manual, and Modulated).
• When using the external IQ inputs, use the MANUAL reference mode, and make sure the external
I/Q signal is present when executing a power search. If the external I/Q signal is not present, the
power search will fail.
Example: Automatic Power Search
1. Preset the signal generator.
2. Set the desired frequency.
3. Set the desired amplitude.
4. Turn the RF output on.
5. Deactivate the signal generator’s automatic leveling control:
Press AMPTD > ALC Off On to highlight Off
Deactivating the signal generator’s automatic leveling control is a significant instrument change
that automatically initiates a power search.
When set to Auto, power search automatically executes when a significant instrument setting changes.
The Do Power Search feature enables you decide when to execute a power search to compensate for
changes, such as temperature drift or a change in the external input.
Using an Output Offset, Reference, or Multiplier
Setting an Output Offset
Using an output offset, the signal generator can output a frequency or amplitude that is offset
(positive or negative) from the entered value.
RF Output = entered value − offset value
Displayed Value = output frequency + offset value
To set an offset:
• Frequency: Press Freq > Freq Offset > offset value > frequency unit.