8
Adjust the digital LED
Best of all, however, is to use both at the same time. The ’scope
will show you the real-time video of what the reader is “seeing”
on the soundtrack, while the computer will numerically display,
focus, azimuth, vertical jitter, lateral alignment and more. Taken
all together, proper alignment is quick, easy, and accurate. (If you
are running loops, try to make them fairly long so that the splice
doesn’t come around too often). The digital reader optics should
be close enough for you to find a ‘scope picture similar to this
illustration.
The first thing is to
adjust the digital LED
.
You want the
brightest and most even light you can get. This will be indicated
on the ’scope screen by the flattest trace with the greatest
amplitude. Now that you have adjusted the analog LED, you
know the routine except that this time you will be working with
the outer LED only. Be careful not to loosen the analog LED
mount so that you won’t have to do all that work over again. A
large saw tooth surface in the trace means you must fine adjust
the rotational alignment of the LED.
