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Topic: DTS reader gives rounded rather than square waveform
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John Hawkinson
Film God
![](http://www.film-tech.com/ubbmembers/1135b.jpg)
Posts: 2273
From: Cambridge, MA, USA
Registered: Feb 2002
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posted 03-21-2009 07:45 PM
We should have posted what happened here! Sorry about that. Here's a view of the initial problem:
![-](http://www.film-tech.com/uploads/uploads0503/9536-before.gif)
The image on top is the malfunctioning reader. The one beneath is the good reader. I think we spent too much time on introspection about this problem (specifically the rise time), worrying about whether it was a slow photocell, dying LED, etc., etc. DTS engineering suggested it was a bad cell.
But it turned out that adjusting the lateral alignment was all that was necessary to fix the slow rise time issue and get good performance out of this reader. I don't have quite as comparable scope captures (first capture is at 710mV/division, second is at 560mV/division), though: ![-](http://www.film-tech.com/uploads/uploads0503/9536-after.gif)
I'm not sure what the takeaway is. "Sometimes you have to adjust the lateral alignment," I guess. This was not a problem specific to a particular print, either.
--jhawk
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