Agilent Technologies E4438C - Manual (Page 122)

Adjustments
Digital Gain Adjust Calibration
4-30
Digital Gain Adjust Calibration
Description
This calibration adjusts the GAIN ADJUST DAC on the A13 Output. This DAC is used to control the RF
power level that is incident upon the switched filters and subsequent RF amplifiers by setting the control
point for the gain adjust modulator. This calibration ensures that there will be sufficient power available at
the RF amplifiers to perform the desired modulation while minimizing intermodulation distortion when the
digital modulation is activated. After adjustment, the results are stored in the signal generator’s firmware.
Required Test Equipment
• Agilent E4418B E-Series power meter
• Agilent E9304A E-Series power sensor
• Agilent 3458A Option 002 digital multimeter
• Agilent 33120A function generator
Procedure
Figure 4-22 Digital Gain Adjust Calibration Setup
1. Connect the equipment as shown above.
2. Preset all of the equipment.
3. Follow the instructions as they appear on the controller’s display.