Agilent Technologies E8247C PSG CW, E8267C PSG, E8257C PSG manual Using External Leveling

Optimizing Performance

Using External Leveling

Using External Leveling

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

Figure 3-2illustrates 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

•Agilent 8474E negative detector

•Agilent 87301D directional coupler

•cables and adapters, as required

Connect the Equipment

Set up the equipment as shown in Figure 3-2.

Figure 3-2 External Detector Leveling with a Directional Coupler

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