Date   
Re: Tek 2215

 

On Tue, 26 Jan 2016 18:35:58 -0600 (CST), you wrote:

On Tue, 26 Jan 2016, Dwayne Verhey tekscopes@... [TekScopes] wrote:
On Tue, 26 Jan 2016, Tothwolf tothwolf@... [TekScopes] wrote:

Unfortunately I'm unable to open any of the files I've downloaded from
there. Both of my PDF readers are saying they are encrypted and require
a password.
Interesting. PDFProtection Manager can't access them either.

However, they will open just fine in FireFox's PDF viewer. From there I
was able to print to PDF (using cutepdfwriter) and the resulting file
opened quite cheerfully in Acrobat.
It looks like they were created with Acrobat X and use the encrypted
PDF-1.7 format so older Adobe and non-Adobe PDF software can't open them.
I wonder why Foxit does not have any problems then other than the
stupid "secured" restrictions.

Re: Tek 2215

 

On Tue, 26 Jan 2016 18:08:19 -0600 (CST), you wrote:

On Tue, 26 Jan 2016, David @DWH [TekScopes] wrote:

I would go over it with a soldering iron after lightly sanding the
surfaces. Assuming that you can remove it easily from the printed
circuit board, dilute HCl can be used if wetting is a problem.
I've thought about tinning the brackets with Sn-Pb, but I'm not really
sure I want to put a thick coating of solder on them. I own several solder
pots, so it would be pretty trivial to clean the surface, coat with liquid
flux and then dip each bracket in one of the pots.
I would make the coating as thin as possible which is easy to do with
a soldering iron but a solder pot would be even better.

I have occasionally done this to the leads of ICs removed from a
printed circuit board. I add a bit of solder to both sides of all of
the leads by running the iron quickly back and forth and then use
solder wick to remove all of the excess. They come out looking almost
new and sometimes better than from the factory.

I would be prepared for poor wetting if the shield is steel but since
it is already tin plated, that may not be a problem.


...

Given the high voltage components directly next to the bracket and that
tin whisker growth seems to be more common around high voltage and high
frequency components, that bracket probably should have never been plated
with pure tin anyway. I think the bracket really should have been nickel
plated from the factory, and was probably only tin plated for cost
savings, so I think the most correct thing to do though, would be to
replate it with nickel.
I would be more proactive than usual in fixing this since it is in
proximity to high voltage high impedance circuits.

That said, I noticed the same problem in my Simpson 464 meters with
brackets nowhere near any high voltage. The two brackets in each of my 464
meters which join the LED display board to the main board at a right angle
are absolutely covered with long tiny tin whiskers. Whatever I end up
doing with the focus control brackets in my 2213 scopes I will likely also
do to the display mounting brackets in the 464s.
I have not run across tin whiskers in a Tektronix instrument yet. Now
I know to be alert for it.

Re: Tek 2215

John Clark
 

I tried one with Foxit 7.2.8.1124 and was able to print to CutePDF.



It looks like they were created with Acrobat X and use the encrypted
PDF-1.7 format so older Adobe and non-Adobe PDF software can't open them.

















[Non-text portions of this message have been removed]

Re: Tek 2215

Tothwolf
 

On Tue, 26 Jan 2016, Dwayne Verhey tekscopes@... [TekScopes] wrote:
On Tue, 26 Jan 2016, Tothwolf tothwolf@... [TekScopes] wrote:

Unfortunately I'm unable to open any of the files I've downloaded from there. Both of my PDF readers are saying they are encrypted and require a password.
Interesting. PDFProtection Manager can't access them either.

However, they will open just fine in FireFox's PDF viewer. From there I was able to print to PDF (using cutepdfwriter) and the resulting file opened quite cheerfully in Acrobat.
It looks like they were created with Acrobat X and use the encrypted PDF-1.7 format so older Adobe and non-Adobe PDF software can't open them.

Re: Tek 2215

 

On Tue, 26 Jan 2016 17:45:46 -0600 (CST), you wrote:

On Tue, 26 Jan 2016, David @DWH [TekScopes] wrote:
On 26 Jan 2016 09:12:17 -0800, you wrote:

Have you guys seen this ??

Mod Kits, Parts Replacement Kits and other documents http://hakanh.com/dl/kits.htm

http://hakanh.com/dl/docs/kitinstructions/050-2242-03.pdf
http://www.hakanh.com/dl/docs/troubleshooting_tips_on_2200_ps.pdf
http://hakanh.com/dl/docs/kitinstructions/040-1099-00.pdf
http://hakanh.com/dl/docs/kitinstructions/045-0034-00.pdf
I have but last time I looked the actual PDF files were not linked; it
was just a list.

"This modification kit contains the parts and instructions for
installing a fan system [into] a standard 7603 Oscilloscope. The fan
provides cooling for improved reliability, especially when high power
consumption plug-ins are used in the mainframe."

That's the fan I have! 7603 fan mystery solved!
The links are definitely new. I was looking for some of these documents
last year and found the page but it was just a list of document ids and
descriptions then.

Unfortunately I'm unable to open any of the files I've downloaded from
there. Both of my PDF readers are saying they are encrypted and require a
password.
I ran a test and have the same problem if I use Adobe Acrobat version
8.0 (the one I have currently installed) however I normally use Foxit
Reader version 4.3.1.0323 (an old one because later versions remove
features and screw up Windows) and it just reports that the documents
are secured meaning I cannot use copy/paste.

If needed I can go through and "fix" the PDF files and make them
available as a torrent.

I do not know why people bother setting the security on Adobe PDF
files like this. It is just annoying and makes them more difficult to
use.

Re: Tek 2215

Torch Fireman
 

Interesting. PDFProtection Manager can't access them either.

However, they will open just fine in FireFox's PDF viewer. From there I was able to print to PDF (using cutepdfwriter) and the resulting file opened quite cheerfully in Acrobat.


Unfortunately I'm unable to open any of the files I've downloaded from
there. Both of my PDF readers are saying they are encrypted and require a
password.

Re: Viable alternative to Yahoo

Vince Vielhaber
 

Discourse isn't exactly free any more.

Vince.

On Tue, January 26, 2016 6:56 pm, @dfnr2 [TekScopes] wrote:
There is something called Discourse that we have been using at the Dallas
Makerspace.

Initially the makerspace had a mailing list, but that became too unruly,
hard to search, follow, or archive threads, etc.


There was an attempt to move to a forum, but some resisted moving away
from the email interface; and many just didn't check out the forum often
enough, so there was no efficient way to get a wide audience outside the
email list, which was not adequate.


Somebody discovered Discourse ( https://www.discourse.org/
https://www.discourse.org/ )


It's a free, open source app that can act like the best of mailing list
and forum.


It's a constant stream like a mailing list


It has tags (like gmail) rather than folders/subforums. You can view by
tags, just like navigating folders, or just see everything in the order
it came in.



It has a seamles email gateway, so you can set up your email preferences,
and only get emailed stuff you are interested in, and reply by email.


It has a really nice web interface that allows you to view topics (tags)
and have discussions just like a forum, with a clean user experience.



There's an iphone app for it (unlike forums and yahoo)


I think it's a really viable alternative to the ad-laden ever worsening
yahoo user experience.


Dave





)







--
Michigan VHF Corp. http://www.nobucks.net/ http://www.CDupe.com/
http://www.foggymist.com The Foggy Mist Emporium

Re: Tek 2215

Tothwolf
 

On Tue, 26 Jan 2016, David @DWH [TekScopes] wrote:
On Tue, 26 Jan 2016, Stefan Trethan stefan_trethan@... [TekScopes] wrote:
On Tue, Jan 26, 2016 at 12:12 PM, Tothwolf tothwolf@... [TekScopes] wrote:

One other issue I noticed which I forgot to mention in my posts to the list last year was the metal bracket that the focus control is mounted to was showing signs of tin whisker growth in all 3 of my 2213 scopes. While I had it and the potentiometer removed so I could replace the 6 1M ohm resistors, I lightly abraded the surface of the bracket to knock the tin whiskers down, but I know if I leave the plating as-is, they will without a doubt eventually return. I am considering using electrolysis to strip the tin plating and then replate the steel bracket with nickel. You can just barely see eruptions in the tin plating on the right side of the bracket in this photo, but up close, 3-5mm long tin whiskers were pretty easy to see.

http://strudel.ignorelist.com/~tothwolf/photos/Tektronix_2213/Tektronix_2213_3/1600/IMG_9288.1600.jpg
You might be able to tin the sheetmetal using 60/40 solder and a big soldering iron or a hotplate or something. That would solve the problem for good.

(Although light brushing and painting with some acrylic laquer would probably suffice to eliminate any issues during your lifetime).
I would go over it with a soldering iron after lightly sanding the surfaces. Assuming that you can remove it easily from the printed circuit board, dilute HCl can be used if wetting is a problem.
I've thought about tinning the brackets with Sn-Pb, but I'm not really sure I want to put a thick coating of solder on them. I own several solder pots, so it would be pretty trivial to clean the surface, coat with liquid flux and then dip each bracket in one of the pots.

Another easy option of course would be conformal coating or some sort of spray lacquer, but that also doesn't really seem to be the /right/ way to fix it.

I could also heat the bracket with a propane torch (after removing from the board obviously) or even just replace the bracket entirely with a new one made of brass, aluminum, or zinc plated steel.

Given the high voltage components directly next to the bracket and that tin whisker growth seems to be more common around high voltage and high frequency components, that bracket probably should have never been plated with pure tin anyway. I think the bracket really should have been nickel plated from the factory, and was probably only tin plated for cost savings, so I think the most correct thing to do though, would be to replate it with nickel.

That said, I noticed the same problem in my Simpson 464 meters with brackets nowhere near any high voltage. The two brackets in each of my 464 meters which join the LED display board to the main board at a right angle are absolutely covered with long tiny tin whiskers. Whatever I end up doing with the focus control brackets in my 2213 scopes I will likely also do to the display mounting brackets in the 464s.

Re: Viable alternative to Yahoo

 

There is something called Discourse that we have been using at the Dallas Makerspace.

Initially the makerspace had a mailing list, but that became too unruly, hard to search, follow, or archive threads, etc.


There was an attempt to move to a forum, but some resisted moving away from the email interface; and many just didn't check out the forum often enough, so there was no efficient way to get a wide audience outside the email list, which was not adequate.


Somebody discovered Discourse ( https://www.discourse.org/ https://www.discourse.org/ )


It's a free, open source app that can act like the best of mailing list and forum.


It's a constant stream like a mailing list


It has tags (like gmail) rather than folders/subforums. You can view by tags, just like navigating folders, or just see everything in the order it came in.



It has a seamles email gateway, so you can set up your email preferences, and only get emailed stuff you are interested in, and reply by email.


It has a really nice web interface that allows you to view topics (tags) and have discussions just like a forum, with a clean user experience.



There's an iphone app for it (unlike forums and yahoo)


I think it's a really viable alternative to the ad-laden ever worsening yahoo user experience.


Dave





)

Re: Tek 2215

Tothwolf
 

On Tue, 26 Jan 2016, David @DWH [TekScopes] wrote:
On 26 Jan 2016 09:12:17 -0800, you wrote:

Have you guys seen this ??

Mod Kits, Parts Replacement Kits and other documents http://hakanh.com/dl/kits.htm

http://hakanh.com/dl/docs/kitinstructions/050-2242-03.pdf
http://www.hakanh.com/dl/docs/troubleshooting_tips_on_2200_ps.pdf
http://hakanh.com/dl/docs/kitinstructions/040-1099-00.pdf
http://hakanh.com/dl/docs/kitinstructions/045-0034-00.pdf
I have but last time I looked the actual PDF files were not linked; it was just a list.

"This modification kit contains the parts and instructions for installing a fan system [into] a standard 7603 Oscilloscope. The fan provides cooling for improved reliability, especially when high power consumption plug-ins are used in the mainframe."

That's the fan I have! 7603 fan mystery solved!
The links are definitely new. I was looking for some of these documents last year and found the page but it was just a list of document ids and descriptions then.

Unfortunately I'm unable to open any of the files I've downloaded from there. Both of my PDF readers are saying they are encrypted and require a password.

Re: Viable alternative to Yahoo

Carl Hallberg
 

Very funny! Carl W9CJH
--------------------------------------------

On Tue, 1/26/16, jackreynolds196@... [TekScopes] <TekScopes@...> wrote:

Subject: Re: [TekScopes] Viable alternative to Yahoo
To: TekScopes@...
Date: Tuesday, January 26, 2016, 3:17 PM


 









Given the profusion of Call Signs one sees attached
to signatures, a very large percentage of members would be
quite comfortable using this new media. They can probably
send morse faster than they can type!!

Jack Reynolds



[Non-text portions of this message have been removed]













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Re: Viable alternative to Yahoo

Jack Reynolds
 

Given the profusion of Call Signs one sees attached to signatures, a very large percentage of members would be quite comfortable using this new media. They can probably send morse faster than they can type!!
Jack Reynolds

Re: Viable alternative to Yahoo

John Griessen
 

On 01/25/2016 11:36 PM, Stefan Trethan stefan_trethan@... [TekScopes] wrote:
even
if it comes down to communicating in morse code by clicking on
advertisements.
Ha ha ha...

Re: Hello from new member w 2465A issues

Ed Breya
 

Please disregard my previous post about raw DC filter caps. I commented earlier on the paper caps (#124531), and didn't realize this discussion was still about them. Duh.


Ed

Re: Hello from new member w 2465A issues

 

The OEM caps C1016 and C1018 are made of metalized paper with plastic cases.  The cases eventually crack and become susceptible to moisture intrusion which permeates the paper, creates leakage, which creates heat.  My guess is the scope was recently submitted to high humidity without being powered.  Once power was applied both of the old caps heated rapidly and failed explosively.
The modern solution is to use plastic film caps of similar ratings.  The modern plastics are less likely to crack and if it does, the plastic film is not so susceptible to moisture intrusion.  My advice is to always replace these caps as part of the "recapping" of  24X5 series scopes. 


From: "armin.schon@... [TekScopes]" <TekScopes@...>
To: TekScopes@...
Sent: Tuesday, January 26, 2016 11:48 AM
Subject: [TekScopes] Re: Hello from new member w 2465A issues

  After confirming that C1016 and C018 have blown up I wonder why they would fail within seconds of each other. Is that to be expected they way this circuit works, or does it point to the failure of another component, which cause the caps to blow out?



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[Non-text portions of this message have been removed]

Sorry about the multiple posts.

Bill (Doc) Courtright
 

I don't know what happened but I kept receiving 'error cannot send message'
I apologize again,
Thanks,
Bill
KB3DKS

Tek Type M Four Trace Amplifier P.I. F.S.

Bill (Doc) Courtright
 

More house cleaning, I have a fairly nice Type M 4 trace preamp P.I., nuvistor based with a couple of tubes. It was last used about 20 years ago when I had a nice working 547. That got left behind when moving to MA but I kept the PI hoping to find another mainframe.
It is complete and in nice condition but will need detailed cleaning and cleaner on the switches as I can see that the silver plated contacts have tarnished. There is also some soot filming that cleans off easily with alcohol.
Asking $45 plus shipping from 01247 via USPS for about 5.5 lbs.
Thanks,
Bill
KB3DKS

Tek Type M Four Trace Preamp F.S.

Bill (Doc) Courtright
 

More house cleaning, I have a fairly nice Type M 4 trace preamp P.I., nuvistor based with a couple of tubes. It was last used about 20 years ago when I had a nice working 547. That got left behind when moving to MA but I kept the PI hoping to find another mainframe.
It is complete and in nice condition but will need detailed cleaning and cleaner on the switches as I can see that the silver plated contacts have tarnished. There is also some soot filming that cleans off easily with alcohol.
Asking $45 plus shipping from 01247 via USPS for about 5.5 lbs.
Thanks,
Bill
KB3DKS

Tek Type M Four Trace Preamp F.S.

Bill (Doc) Courtright
 

More house cleaning, I have a fairly nice Type M 4 trace preamp P.I., nuvistor based with a couple of tubes. It was last used about 20 years ago when I had a nice working 547. That got left behind when moving to MA but I kept the PI hoping to find another mainframe.
It is complete and in nice condition but will need detailed cleaning and cleaner on the switches as I can see that the silver plated contacts have tarnished. There is also some soot filming that cleans off easily with alcohol.
Asking $45 plus shipping from 01247 via USPS for about 5.5 lbs.
Thanks,
Bill
KB3DKS

Tek Type M Four Trace Preamp F.S.

Bill (Doc) Courtright
 

More house cleaning, I have a fairly nice Type M 4 trace preamp P.I., nuvistor based with a couple of tubes. It was last used about 20 years ago when I had a nice working 547. That got left behind when moving to MA but I kept the PI hoping to find another mainframe.
It is complete and in nice condition but will need detailed cleaning and cleaner on the switches as I can see that the silver plated contacts have tarnished. There is also some soot filming that cleans off easily with alcohol.
Asking $45 plus shipping from 01247 via USPS for about 5.5 lbs.
Thanks,
Bill
KB3DKS