To begin, make sure your DAC is connected to your computer and projector. Run LSX and click the 'Edit Scanning Optimizations' button on the upper toolbar. It has an icon that looks like a speedometer. This opens the Optimization page of the settings dialog of LSX. There are a lot of settings, but don't let that worry you, we won't be dealing with those right away. Just focus on two things right now: the PointRate setting over on the right and the TestFrames box on the left.
You want to start by setting the PointRate to the rate that your scanners are advertised as being able to achieve. Then in the TestFrames box, select ILDA Test Frame and click 'Display Test Frame'. Your projector will now be displaying the ILDA test frame, assuming your DAC was found by LSX.
- TestFrame as it looks in the preview window.
- testframe.png (6.06 KiB) Viewed 24029 times
The first thing to notice is the way two shapes are being scanned in the very inner center of the pattern: the inner circle and the inner square. A properly tuned scanner pair will display a perfectly round circle with the circle edges just touching the flat edges of the square (not its corners, as it appears in the preview), when the central ILDA test pattern is scanned at the manufacturer's scan angle (commonly 8 degrees).
If the circle is not round, but slanted oval, it means the scanners are tuned to slightly different frequencies, or your DAC (if it is a sound card DAC) is producing x/y points with a time skew between them.
If the circle is smaller and completely inside the square, it means that the point rate you have selected is too fast for the scanners to draw. The scanners either need to be tuned, or you need to reduce the PointRate setting in the Optimization dialog. Reduce the PointRate by sliding to a lower point rate (or using the arrows), then toggling 'Display Test Frame' off, then on again.
When you have found a point rate that your scanners can draw the circle and square properly, you have found their current tuning kpps rate. Click 'Save ScanParameter for autoload' to save your kpps setting for future use in shows that use the 'Default' named Optimization set.