Keysight E8357D/67D & E8663D PSG User’s Guide 147
Optimizing Performance
Using External Leveling
Using External Leveling
CAUTION
External leveling works from –15 dBm to maximum power.
The PSG signal generator can be externally leveled by connecting an external
sensor at the point where leveled RF output power is desired. This sensor
detects changes in RF output power and returns a compensating voltage to
the signal generator’s ALC input. The ALC circuitry raises or lowers (levels) the
RF output power based on the voltage received from the external sensor,
ensuring constant power at the point of detection.
There are two types of external leveling available on the PSG. You can use
external leveling with a detector and coupler/power splitter setup, or a
millimeter–wave source module.
To Level with Detectors and Couplers/Splitters
illustrates a typical external leveling setup. The power level
feedback to the ALC circuitry is taken from the external negative detector,
rather than the internal signal generator detector. This feedback voltage
controls the ALC system, leveling the RF output power at the point of
detection.
To use detectors and couplers/splitters for external leveling at an RF output
frequency of
10 GHz and an amplitude of 0 dBm, follow the instructions in this section.
Required Equipment
— Keysight 8474E negative detector
— Keysight 87301D directional coupler
— cables and adapters, as required
Connect the Equipment
Set up the equipment as shown in
.
Figure 4-2
External Detector Leveling with a Directional Coupler
