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Adjustments

ALC Calibration

4-32

ALC Calibration

Description

This calibration is used to ensure zero offset and linear performance of the ALC Reference DAC. This is done

by adjusting four different “control DACs”. The Log Offset DAC is adjusted first to center the ALC loop

around a reference-setting of 2048. Next, the Detector Offset DAC and Bulk R Adj DAC are iteratively

adjusted to achieve linearity over the entire ALC range. Finally, the Ref Gain DAC is adjusted to achieve a

final ALC slope (nominally 50 DAC counts/dB at a single frequency).

Figure 4-24 ALC Calibration

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Agilent Technologies E4438C Guide d'installation Page 124