Tektronix 7S11 question

Dec 16, 2006 3 Replies
D

I already asked this in the TekScopes list on Yahoo, but so far no one has stepped up to answer it there.



One of my 7S11s (SN B125nnn) appears to largely match the description in the military service manual I downloaded from BAMA (even though it is clearly a later unit than covered by that manual as the vertical board is level 01 revision).



The other one has serial B102nnn, and has a different "dot response" control. The pot has a switch detent in the fully CCW position and there's a 10 turn pot mounted on a small piece of matrix board just behind the control. There is an EC wire running from the matrix board to the lower side of the toroid near the rear of the Vertical board. I *think* that when the pot is turned into the detent, the switch is actuated and the dot response setting is taken from the rear mounted pot rather than the front panel control.



This particular unit was for many years the property of Tektronix Sweden, and still has Tektronix Asset stickers.



Clearly this change will have an impact on the calibration procedure, so I have a couple of questions:


1) Is this a normal production or service modification, or a "special"?


2) Would it be likely to be covered in the commercial manual? If so are there any specific manual revision dates that I would need to make sure that this is covered?



Thanks Dave Partridge (remove xwy from replyto email address)


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J

"David C. Partridge" wrote in news: snipped-for-privacy@pipex.net:

It sounds like a non-TEK mod. Tek did not use "matrix board" in any official TEK mods. Now,some Tek-Sweden employee could have installed it on their own.(not TEK sanctioned,either.) Maybe a tech needed a finer adjustment than he got from the stock front panel pot.I did that on a SG505 audio generator output level control while at TEK.

By "matrix board",I'm guessing you mean perforated board,maybe with plated thru-holes,and not an etched PCB of some sort?

Jim Yanik jyanik at kua.net
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D

I've found out what this is all about from the previous owner of the plug-in.

It was a custom modification: The purpose of it was to get a preset Dot Response setting when calibrating customer's sampling heads.

Turning the switch into the detent results in the dot response setting being taken from rear 10 turn pot rather than the front panel control as I suspected.

Dave

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J

"David C. Partridge" wrote in news: snipped-for-privacy@pipex.net:

TEK custom mods will have a modified product foil tag on it so they can reference the proper documentation.And they did not use perf board for those mods.

AFAIK,TEK does not do custom mods anymore because they do not want to do the documentation,nor the custom parts support.

That is the problem with custom mods;others may not know what the mod is for or what it does,the documentation is lacking,custom parts may not be available,and cal procedures may be affected.

Jim Yanik jyanik at kua.net
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