
14
Digital Focus
If you have gone through to this point using your oscilloscope you may be able to set the focus using
both the scope and DRAS.
Thread and run Dolby Cat. No. 69T. Use an oscilloscope and a PC running Dolby's DRAS program to
view the digital trace and see the focus statistic. Rotate the focus ring to fine-tune the focus. A
"hollowness" in the digital burst will be visible on the scope. Results in DRAS that are above 50 are
usual.
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