Agilent Technologies E4438C Przewodnik Instalacji Pobierz pdf (Strona 121)

Adjustments

VBLO Mixer Bias Calibration

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VBLO Mixer Bias Calibration

Description

This calibration adjusts the VBLO MIXER BIAS DAC on the A13 Output. This DAC is used to control the

bias voltage to the internal 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 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.

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Agilent Technologies E4438C Przewodnik Instalacji Strona 121