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Hi Pete,
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You know as well as I do that it is always easy to second guess the designers if you don't know what problems they were faced with. The environment the board is in may have played a part in determining to use 4 layer boards. The scope has to be able to measure very low level, very high bandwidth, signals. 4 layers would minimize EMI from that part of the system and maybe that was a consideration. You can't always add an effective ground plane on a two layer board. Dennis -----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] Sent: Wednesday, September 10, 2014 10:35 AM To: TekScopes@... Subject: Re: [TekScopes] 11403A Display Pretty much agree. In a way I was being sarcastic. But then I've worked on a few very high performance displays and the boards were mostly 2 layer. I have a somewhat working early S/N 11403. If I can't get this display working, I'll see what I can swap out of the 11403. When done I'll see how hard it will be to draw up a schematic for the display. -pete |
