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Fooling the Display Adapter

A project log for The VLT - Video Latency Tester

The VLT is a tool to measure how long it takes (in milliseconds) for a video signal to change from one state to another.

nathan-danielsNathan Daniels 09/18/2017 at 07:140 Comments

I needed a way for the computer to ‘think’ it was plugged into a display or projector. Initially I tried to read a voltage directly from the VGA output of my computer, however this was not possible for me. To solve this I used a Kramer VP-211DS. This piece of equipment is designed to be a VGA switcher. It also amplifies the signal as it runs from a 12 volt wall socket power source. The switching mechanism of the Kramer VP-211DS is not used in this project, as its sole use is to power the video signal and allow the computer to output a VGA video feed. Any other device that causes the laptop computer to detect a display can be used for this project. Future hardware changes of this project may wish to eliminate to VGA Switcher altogether by constructing the circuitry needed for a dummy display to initialise.

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