Atec Agilent-8563E - Manual (Page 131)

Adjustments ESG Family Signal Generators
VBLO Mixer Bias Calibration
5-34 Calibration Guide
VBLO Mixer Bias Calibration
Description
This test calibrates the VBLO MIXER BIAS DAC on the output board. This DAC is used to
control the bias voltage to the internal marble mixers. This DAC is primarily used to
adjust the mixer bias for optimum I/Q modulation linearity, but it has a secondary
influence on mixer gain. This calibration ensures that there will be sufficient power
available through the marble mixers 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
• None
Procedure
1. Preset the signal generator.
2. Follow the instructions as they appear on the controller’s display.