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Periodic Fixed TAS Setting
When running the probe unattended with a fixed true air speed (TAS), enabling this option will ensure
that once per minute, the user-supplied TAS setting is sent to the probe. It is best to leave this disabled.
AI Laser Adjustments: Automated laser power adjustment saves the operator from having to optimize
laser settings continuously. The settings here are typical.
Figure 5.3.10 Automated Laser Power Adjustment
Algorithm for Adjusting Laser Power
The acceptable voltage range for the 2D-S is 1.5 to 3.5 volts. Below that voltage noisy bits are known to
occur. Above that value circuit saturation occurs and imaging is compromised. The purpose of the AI
algorithm will be to make sure the instrument is working at its peak performance during unsupervised
flight.
The AI command box needs 6 user adjustable values to set the AI.
1. The first input needs to be the Desired Maximum Voltage (DMV). This is the array voltage that
we’d prefer to see in the housekeeping data.
SPEC 3V-CPI Preliminary Technical Manual
Page 115
February 2012
SPEC Inc. reserves the right to make improvements and changes to the 3V-CPI and related software at
any time and without notice.