Re: Purpose of Q32 in S-52
On Tue, Jul 7, 2020 at 04:07 PM, Albert Otten wrote:
Anyone an idea? Some kind of protection perhaps, but against which condition?
Just a hunch, didn't study the schematic much nor thought this through but low -12V (closer to 0V) would lead to Q32 conducting from ca. -7.5V (?), pulling down on R30 (point 10). Could this stop the TD from permanently being in the triggered state (carrying I > Ip) with risk of being damaged? The other negative supply voltages will remain present to say at least -6V instead of -12V. Raymond
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Re: Purpose of Q32 in S-52
Against excessive positive (+15 V) supply I presume.
If for any reason the positive suplly voltage is too high, the TD can be damaged by an excessive current.
It is veeery small and must tolerate 50 mA peak....
Doing so, with Q32 conducting the TD never fires. A some kind of minimal security.
Max
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Hi all,
A recent topic (ending at message #168946) about S-52 repair brought up the mysterious role of Q32. During normal S-52 operation Q32 will never conduct .
Anyone an idea? Some kind of protection perhaps, but against which condition?
Albert
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Re: Hakko FR-301 alternatives?
I will have a supply of ZD985 pump diaphragms in a few weeks. Please context me off list if interested.
EJP
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Re: Tek TS-4353/U Distortion Analyzer and 500 series plug-ins
Hi Dick, The Operator's Manual of this TestSet is in the File Section of this Group. /g/TekScopes/files/SG505%20MOD%20WR%20WQ%20AA501A%20MOD%20WQ.pdfMore interesting is the Service Manual of this TestSet. Seen only once on eBay (old Tucker Store).The AA501 MOD WQ has special Custom Made Filters in it. Greetings, Egge Siert
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Re: 7000-series plug-in power tester
Hi, I the guy who is making a standalone power and signal adapter board. The original post is here /g/TekScopes/topic/74053244#168481To answer your question, would be it worth doing? No it does not worth it at all for the trouble you go through, if the goal is only powering some plugins for troubleshooting. I have three flexible extenders, and one rigid extender with more than 4 working 7000 mainframes (even more if count broken ones). But I am still spending a significant portion of my night to make it happen. Why? The value is not in the power adapter board itself. The value is in that you enable these plugins to be used on modern digital scope. No company make 100 MHz differential amplifier anymore (at least not I am aware of) => 7L13 Low noise low frequency measurement with adjustable bandwidth=> 7A22 Hard to get capability for very low frequency spectrum analyzer for audio work => 7L5 Capability to get better noise floor than 1mVpp @ >100MHz => 7A26 is about 120uV level although not easily available due to limited 5mV/div max gain Sampling plugins 7S12, 7S14 TDR => 7S12 Curve tracer 7CT1N The above items are the ones that I can make sense of it. There may be other benefit to enable these plugins being used on digital scopes.
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Re: Strange TM 500 plugin to ID
I'm going to find it a HOME! You can use it ??? Make me an offer I can't refuse! On 6 Jul 2020 at 12:05, Michael W. Lynch via groups.io wrote: On Mon, Jul 6, 2020 at 01:07 PM, kim.herron@... wrote:
Hi Michael!!
Have you looked on Tekwiki? Is this it?
(
)
Another Member sent this to me.? Seems this is listed at
Tekwiki.? I put
this in a search
but it didn't come up.? Oh well, I learned something too!
Kim,
I did see that reply. I'm going to do some additional reading about
it.
Yes, TEKWiki is a wonderful source. I do not know why I did not
think to search for this item myself. I guess that I "assumed" that
you had done a search and failed to find it?
I was skimming through the manual and it seems to offer some help in
understanding Logic and Logic Analyzers.
What are you planning on doing with it?
--
Michael Lynch
Dardanelle, Arkansas
John Goller, K9UWA & Jean Goller, N9PXF Antique Radio Restorations k9uwa@... Visit our Web Site at: 4836 Ranch Road Leo, IN 46765 USA 1-260-637-6426
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Re: Strange TM 500 plugin to ID
On Mon, Jul 6, 2020 at 01:07 PM, kim.herron@... wrote:
Hi Michael!!
Have you looked on Tekwiki? Is this it?
(
)
Another Member sent this to me.? Seems this is listed at Tekwiki.? I put
this in a search
but it didn't come up.? Oh well, I learned something too!
Kim, I did see that reply. I'm going to do some additional reading about it. Yes, TEKWiki is a wonderful source. I do not know why I did not think to search for this item myself. I guess that I "assumed" that you had done a search and failed to find it? I was skimming through the manual and it seems to offer some help in understanding Logic and Logic Analyzers. What are you planning on doing with it? -- Michael Lynch Dardanelle, Arkansas
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Re: S-52 only works with lowered +15 V power supply
I put 9090 ohm 1% and 22k ohm 5% resistors and now the circuit works perfectly.
Thanks Albert for your valuable suggestions!
Thanks also to Dan for exposing the latest changes to the schematic. I have written everything down, my manual is not so recent.
Max
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Re: Strange TM 500 plugin to ID
Hi Michael!! Have you looked on Tekwiki? Is this it? ( ) Another Member sent this to me.? Seems this is listed at Tekwiki.? I put this in a search but it didn't come up.? Oh well, I learned something too! If someone has a use for this thing, let me know.? It's an extra here and I'm running out of room. On 6 Jul 2020 at 9:40, Michael W. Lynch via groups.io wrote: ? >I have a strange TM 500 plug in and I'm guessing that it's a sales
aid or a training
aid.? It is a 067-0872-99 Logic Demo Aid.? It has a Tektronix label
on the side of it that has a Field Engineers name
on it>
I do not see this as "inappropriate".
I am always anxious to learn about such obscure instruments.
Perhaps some of our more knowledgeable members can enlighten us
regarding this?
--
Michael Lynch
Dardanelle, Arkansas
Kim Herron? W8ZV kim.herron@... 1-616-677-3706
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Re: Strange TM 500 plugin to ID
Have you looked on Tekwiki? Is this it?
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-----Original Message----- From: [email protected] [mailto: [email protected]] On Behalf Of kim.herron@... Sent: 06 July 2020 17:37 To: [email protected]Subject: [TekScopes] Strange TM 500 plugin to ID HI All! Hope this is not inappropriate! I have a strange TM 500 plug in and I'm guessing that it's a sales aid or a training aid. It is a 067-0872-99 Logic Demo Aid. It has a Tektronix label on the side of it that has a Field Engineers name on it. That name is Don Dalton. That is crossed out with pencil and the name is Dave Mc Cormick (I think) is written in pencil above it. Anybody know anything about this, what it was used for, or any interest in it?? Thanks !! Kim Herron W8ZV kim.herron@... 1-616-677-3706
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Re: Strange TM 500 plugin to ID
I have a strange TM 500 plug in and I'm guessing that it's a sales aid or a training aid. It is a 067-0872-99 Logic Demo Aid. It has a Tektronix label on the side of it that has a Field Engineers name on it> I do not see this as "inappropriate". I am always anxious to learn about such obscure instruments. Perhaps some of our more knowledgeable members can enlighten us regarding this? -- Michael Lynch Dardanelle, Arkansas
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Strange TM 500 plugin to ID
HI All!
Hope this is not inappropriate!? I have a strange TM 500 plug in and I'm guessing that it's a sales aid or a training
aid.? It is a 067-0872-99 Logic Demo Aid.? It has a Tektronix label on the side of it that has a Field Engineers name
on it.? That name is Don Dalton.? That is crossed out with pencil and the name is Dave Mc Cormick (I think) is
written in pencil above it.? Anybody know anything about this, what it was used for, or any interest in it??
Thanks !!
Kim Herron? W8ZV
kim.herron@...
1-616-677-3706
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Re: 7000-series plug-in power tester
On Mon, Jul 6, 2020 at 10:48 AM, C G wrote:
Hope I did not be mislead some fellows out there...
That's what I was trying to avoid. With current 7000 mainframe prices, purchasing and modifying one especially for this purpose is an option as well. Raymond
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Re: 7000-series plug-in power tester
After checking you're absolutely right. Learnt sth today!
In addition, rewiring may be tedious as even power supplies are not the same.
Hope I did not be mislead some fellows out there...
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Le 6 juil. 2020 ¨¤ 09:37, Raymond Domp Frank <hewpatek@...> a ¨¦crit :
On Mon, Jul 6, 2020 at 09:35 AM, C G wrote:
Find a used TM501. Test and/or recap the power supply. Remove the cover to see
properly what's going on inside and you're done!
TM501 - TekWiki < >
Trying to keep this on track: A TM5xx backplane is not a 7000 backplane.
Raymond
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Re: 7000-series plug-in power tester
On Mon, Jul 6, 2020 at 09:35 AM, C G wrote:
Find a used TM501. Test and/or recap the power supply. Remove the cover to see
properly what's going on inside and you're done!
TM501 - TekWiki < >
Trying to keep this on track: A TM5xx backplane is not a 7000 backplane. Raymond
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Re: 7000-series plug-in power tester
Find a used TM501. Test and/or recap the power supply. Remove the cover to see properly what's going on inside and you're done!
TM501 - TekWiki <>
Christian
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Le 6 juil. 2020 ¨¤ 07:46, Dave Seiter <d.seiter@...> a ¨¦crit :
Does a cable extender with a separate power output header specifically for testing count? Built into a dead plugin, the extender cable terminates into the card edge connector, while the power header is fixed on plugin face for stability.
-Dave
On Sunday, July 5, 2020, 07:44:25 PM PDT, stevenhorii <sonodocsch@...> wrote:
Bill,
Thanks - I saw that link and am interested. I'll go back and find it. My
thought was just for powering the plug-ins, but if you're going to do that,
why not use the inputs/outputs also.
Steve H
On Sun, Jul 5, 2020 at 10:41 PM Bill Perkins <sales@...> wrote:
A few weeks back a fellow posted just such a device, intended to
make
7K-series plug-ins outputs available for DSOs.
I don't have a link, sorry
Bill
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick
"smoke" test of plug-in not known to be good. Outside of the mainframe,
you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good
mainframe?
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Re: 7000-series plug-in power tester
Does a cable extender with a separate power output header specifically for testing count?? Built into a dead plugin, the extender cable terminates into the card edge connector, while the power header is fixed on plugin face for stability.
-Dave
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Show quoted text
On Sunday, July 5, 2020, 07:44:25 PM PDT, stevenhorii <sonodocsch@...> wrote: Bill, Thanks - I saw that link and am interested. I'll go back and find it. My thought was just for powering the plug-ins, but if you're going to do that, why not use the inputs/outputs also. Steve H On Sun, Jul 5, 2020 at 10:41 PM Bill Perkins <sales@...> wrote:
? ? ? ? A few weeks back a fellow posted just such a device, intended to
make
7K-series plug-ins outputs available for DSOs.
? ? ? ? I don't have a link, sorry
? ? ? ? Bill
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick
"smoke" test of plug-in not known to be good. Outside of the mainframe,
you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good
mainframe?
|
Re: 7000-series plug-in power tester
Bill,
Thanks - I saw that link and am interested. I'll go back and find it. My
thought was just for powering the plug-ins, but if you're going to do that,
why not use the inputs/outputs also.
Steve H
toggle quoted message
Show quoted text
On Sun, Jul 5, 2020 at 10:41 PM Bill Perkins <sales@...> wrote:
A few weeks back a fellow posted just such a device, intended to
make
7K-series plug-ins outputs available for DSOs.
I don't have a link, sorry
Bill
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick
"smoke" test of plug-in not known to be good. Outside of the mainframe,
you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good
mainframe?
|
Re: 7000-series plug-in power tester
A few weeks back a fellow posted just such a device, intended to make 7K-series plug-ins outputs available for DSOs.
I don't have a link, sorry
Bill
toggle quoted message
Show quoted text
Has anyone built a tester that would provide all the normal power to a 7000-series plug-in? Would it be worth doing? Maybe a way to do a quick "smoke" test of plug-in not known to be good. Outside of the mainframe, you'd have access to the power rails and test points.
is it worth it as opposed to putting the plug-in into a known good mainframe?
|
Raymond Domp Frank
Michael W. Lynch
Bill Perkins