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124 Chapter 4
Optimizing Performance
Creating and Applying User Flatness Correction
Creating a User Flatness Correction Array
In this example, you create a user flatness correction array. The flatness correction array contains
ten frequency correction pairs (amplitude correction values for specified frequencies), from 1 to
10 GHz in 1 GHz intervals.
An Agilent E4416A/17A/18B/19B power meter (controlled by the signal generator via GPIB) and
E4413A power sensor are used to measure the RF output amplitude at the specified correction
frequencies and transfer the results to the signal generator. The signal generator reads the power
level data from the power meter, calculates the correction values, and stores the correction pairs in a
user flatness correction array.
If you do not have the required Agilent power meter, or if your power meter does not have a GPIB
interface, you can enter correction values manually.
Required Equipment
• Agilent E4416A/17A/18B/19B power meter
• Agilent E4413A E Series CW power sensor
• GPIB interface cable
• adapters and cables, as required
NOTE If the setup has an external leveling configuration, the equipment setup in Figure 4-4
assumes that the steps necessary to correctly level the RF output have been followed. If you
have questions about external leveling, refer to “Using External Leveling” on page 120.
Configure the Power Meter
1. Select SCPI as the remote language for the power meter.
2. Zero and calibrate the power sensor to the power meter.
3. Enter the appropriate power sensor calibration factors into the power meter as appropriate.
4. Enable the power meter’s cal factor array.
NOTE For operating information on a particular power meter/sensor, refer to its operating guide.
Connect the Equipment
Connect the equipment as shown in Figure 4-4.
NOTE During the process of creating the user flatness correction array, the power meter is slaved
to the signal generator via GPIB. No other controllers are allowed on the GPIB interface.