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.

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, the 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 63.

 

 

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.

7.Press More (1 of 2) > Ext Detector Coupling Factor > 16 (or the positive 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.

NOTE

While operating in external leveling mode, the signal generator’s displayed 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 Figure 3-3or

 

measure the power directly with a power meter.

 

 

Chapter 3

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Agilent Technologies E8257C PSG, E8267C PSG, E8247C PSG CW manual Configure the Signal Generator, Signal Generators on

E8267C PSG, E8247C PSG CW, E8257C PSG specifications

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