Optimizing Performance
Using External Leveling
Chapter 3 55
Figure 3-1 External Detector Leveling with a Directional Coupler
Configure the Signal Generator
1. Press
Preset.
2. Press
Frequency > 10 > GHz.
3. Press
Amplitude > 0 > dBm.
4. Press
RF On/Off.
5. Press
Leveling Mode > External Detector.
This deactivates the internal ALC detector and switches the ALC input path to the front
panel ALC INPUT connector. The EXT indicator is activated in the AMPLITUDE area of the
display.
NOTE For signal generators with Option 1E1, notice that the ATTN HOLD (attenuator
hold) annunciator is displayed. During external leveling, the signal generator
automatically uncouples the attenuator from the ALC system for all external
leveling points. While in this mode, RF output amplitude adjustment is limited
to
−
20 to +25 dBm, the adjustment range of the ALC circuitry. For more
information, see “External Leveling with Option 1E1 Signal Generators” on
page 58.
6. Observe the coupling factor printed on the directional coupler at the detector port.
Typically, this value is −10 to −20 dB.
Enter the positive dB value of this coupling factor into the signal generator.
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