Keysight E8267D User Manual page 162

Optimizing Performance
Using External Leveling
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 > Ext Detector.
For signal generators with Option 1E1, notice that the ATTN HOLD (attenuator
NOTE
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, the RF output amplitude adjustment is
limited to -20 to +25 dBm, the adjustment range of the ALC circuitry. For
more information, see
on page
6. Observe the coupling factor printed on the directional coupler at the
7. Press More (1 of 2) > Ext Detector Coupling Factor > 16 (or the positive
While operating in external leveling mode, the signal generator's displayed
NOTE
RF output amplitude is affected by the coupling factor value, resulting in a
calculated approximation of the actual RF output amplitude. To determine
the actual RF output amplitude at the point of detection, measure the voltage
at the external detector output and refer to
directly with a power meter.
Determining the Leveled Output Power
Figure 4-3
typical Keysight Technologies diode detectors. Using this chart, you can
determine the leveled power at the diode detector input by measuring the
148
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.
"External Leveling with Option 1E1 Signal Generators"
149.
detector port. Typically, this value is -10 to -20 dB.
Enter the positive dB value of this coupling factor into the signal
generator.
representation of the value listed at the detector port of the directional
coupler) > dB.
Leveled output power is now available at the output of the directional
coupler.
shows the input power versus output voltage characteristics for
Figure 4-3
Keysight E8357D/67D & E8663D PSG User's Guide
or measure the power