Date   

Re: Suggestion for our group Administrator

Joe
 

I would like to second that, for my two reasons:

- Never change a running system for trifles
- Errors, typos and such are no big deal, science has ever been able to overcome

For me fake news (not in this group but in general) are much worse a problem nowadays

Regards, Joe


Re: Repair of a 7S14

Roger M
 

Jeff,
Sorry I'm more than a little late to this party but I have to ask: since you need an isolated bias supply, one which needs to deliver
little current, and for an application reasonably tolerant of terminal voltage, why the struggle to come up with
a mechanical arrangement for an emitter/detector pair when devices such as the Infineon PVI5080 (a single channel
photovoltaic isolator) are available?

If DIY self-satisfaction is a large part of the answer then I completely understand.
-Roger


Re: TEKTRONINX P6139A shorted, metalic, Grow Metal Crystals? any definitive solution?

Roy Thistle
 

On Sat, Sep 11, 2021 at 07:08 AM, Miguel Work wrote:


there are some king of growing metalic short
Well... I watched the video... and I see you cleaned out the "socket" (on the end of the probe's coax), where the probe tip screws in.... you used alcohol.
Initially... you got a resistance of 0.14229 ohms? (That resistance measurement could be telling.)
We can't really see inside the "socket" to see what's in there... and to observe the phenomenon.
Metal whiskers can grow. It's a known problem; but poorly understood. (Often it is tin whiskers... but, other metals can also have this too.)
Dendrites can also grow: that is an electro-chemical phenomenon.

--
Roy Thistle


Re: Suggestion for our group Administrator

 

I vote NO on editing posts. While I would personally like to be able to fix my typos and mistakes, I value the record of the iterative process.

If having a single, authoritative message on a topic is really important then it should be important enough for somebody to add a summary message to high-value threads. My experience doing research on the group, however, is that most threads don’t get long enough to make reading the entire thread difficult, and the threads that do get long also have so much topic drift that a summary would impossible.

— Jeff Dutky


Re: "mottled effect" on anodized front panel

stevenhorii
 

I’ve seen anodized aluminum exposed to the sun do this.

On Sat, Sep 11, 2021 at 14:24 Sparky99 <jnolan@...> wrote:

Thanks, but I'm sure these marks are not from use as they are distant from
any of the controls - I checked and both plugs ins also have the same
effect, so perhaps due to storage conditions but as I mentioned there are
no signs of any corrosion elsewhere on the plugin.






Re: "mottled effect" on anodized front panel

 

Maybe they are etching from skin contact? Maybe the locations are BECAUSE there are no controls nearby, so that was the convenient place to push when installing the plug-ins, or to rest a hand while using the scope?

It’s too bad you can’t get a good picture of the effect.

— Jeff Dutky


Re: Suggestion for our group Administrator

Tom Gardner
 

On 11/09/21 18:21, pdxareaid via groups.io wrote:
this is my last post on this. i was not leaning at first but am now.
i think we all know we are using yesterday's technology. sure there is much better and i would prefer we use it.
however, this is a legacy forum and the folks with the most knowledge likely would prefer
not to have editing since they are using the email interface.
The content supplied by those with knowledge is why I am here. The email format works well enough for that content.

Web forums have different advantages (and disadvantages). I strongly recommend you look at EEVBlog Forum; it has a lot of Tek and HPAK stuff there.


Re: "mottled effect" on anodized front panel

Sparky99
 

Thanks, but I'm sure these marks are not from use as they are distant from any of the controls - I checked and both plugs ins also have the same effect, so perhaps due to storage conditions but as I mentioned there are no signs of any corrosion elsewhere on the plugin.


Re: Suggestion for our group Administrator

Tom Gardner
 

On 11/09/21 18:09, saipan59 (Pete) wrote:
My 'vote' is also to turn on editing, and to suggest (for those that care) to use digest e-mails so that you don't get many individuals per day.
I don't expect that post-editing will happen 'frequently' anyway. And it feels better than creating *another* post to correct a mistake.
Look at web forums where editing can happen, e.g. the (very good) EEVBlog forum.

A very significant number of posts are edited, some of them several times.

The best thing is to re-read what you wrote before sending it. That reduces the number of times you unnecessarily waste /other/ people's time.

Besides, editing a post is sometimes misused to re-write history. "Students of Soviet history know how difficult it is to foretell the past".

Use emails to their full advantage. Use web forums to their full advantage. Don't accept a race to the bottom of the lowest common denominator of features.


Re: Suggestion for our group Administrator

Tommy
 

My vote: Do not enable editing, do not fix what is working reasonably well...


Re: Suggestion for our group Administrator

 

On Sat, Sep 11, 2021 at 7:16 PM Dave Voorhis <voorhis@...> wrote:

On 11 Sep 2021, at 18:09, saipan59 (Pete) <saipan1959@...> wrote:

My 'vote' is also to turn on editing, and to suggest (for those that care) to use digest e-mails so that you don't get many individuals per day.
I don't expect that post-editing will happen 'frequently' anyway. And it feels better than creating *another* post to correct a mistake.
Unless it’s a different Groups.io <http://groups.io/> forum I’m thinking of, wasn’t editing turned on in the early days of using Groups.io <http://groups.io/>, and didn’t that result in a barrage of emails from a few folks who quite reasonably made frequent edits to their forum posts, but weren't aware it was pumping out emails?
Yes, that's precisely why it's off.

Though maybe that facility has been improved since to only send one email per post per day, or some such.
It's the same as it's been. No changes.

On Sat, Sep 11, 2021 at 6:59 PM Keith <coolblueglow@...> wrote:

The data and ideas we post here are quite long-lived. I routinely search out old threads, hoping for correct and trustworthy answers. I then quite often trust, and apply the claims and advice present therein. But, in doing those searches, I do sometimes find howlers in there, my own and others! In the current model, the person who is quite wrong (like me, sometimes) but also quite convinced when they hit "post", simply has no way to make good on his or her mistaken idea. That is, except to post another tiresome explanation of the thing, admitting, warning others "not to read post #xyz123" etc. It is not efficient.
Editing is enabled on HPAK. No one *ever* does anything like what you
describe. The *only* edit notification emails happen when someone
clueless about the notification emails corrects single-letter typos
one at a time with 5 subsequent notification emails. Infinitely honing
forum posts in here to perfection is a nice pipe dream, but in
practice, no one does this. I can't say it's due to one thing
specifically. I think it's because our memory and recall are finite,
so once you figure out something new, you don't think about the fact
that you made a post about this two years ago, one of 10 000 posts you
made. I think you're looking for a wiki, not for a mailing list.

NB the Tek/HPAK Discord allows editing messages. It can be joined
here: https://discord.gg/g5C2jaAX

I'm not against editing messages, I'm just against editing messages
here, because it's absolutely terrible on what essentially is a mail
reflector with file hosting.

And, when those old posts cannot be corrected, except by re-posting and/or deleting, it just doesn't seem to be building a clear and trustworthy library for future readers. So, just my opinion here, but the long life of mistaken or less-than-best-thinking postings tends to spread mistaken ideas... and it is hard figure out which ones are right and which are wrong. That is, unless one wishes to follow the entire (sometimes extensive) thread and "find" that the misstatement was corrected twenty five messages later. This can be very frustrating and time-consuming.
That's what most people will do anyways. So you're not spared the
search. When reading a post, you won't know if the poster is of the
editing type, or of the follow-up type, and I bet that most will be of
the follow-up type. In fact, most will be of the no edit, no follow-up
type. So you're saving nothing, and you're really killing the email
interface with absolute garbage.


Re: PG506 in need of parts T130

Zentronics42@...
 

Hmm ok something is odd. Transformers should show almost a dead short at DC when you are looking at the windings end to end. However on the different set of windings there should be no connection at DC. Which is what the meter is using. Next thing to look for is a pin out of the transformer or the schematic of the power supply that should tell you what pins are connected and what pins are not connected. In circuit measurements can be influenced by the active components in the circuit. A meter can have enough voltage to forward a transistor or diode and part way turn them on. This will throw off measurements and cause readings to be at best weird. At worst fry a sensitive component. For instance a DMM can kill a tunnel diode. Also check the board. I had an issue in the power supply of one of my TM5006 units. The through hole on the circuit board went bad. Had voltage on the top of the board but not the bottom. Very odd fault and definitely not common. Probing around the transformer with the unit powered up should be done with care there is high frequency high voltage AC at that location. And the PG506 specifically has some elevated voltages in it.

Zen

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of Timothy via groups.io
Sent: Saturday, September 11, 2021 1:41 PM
To: TekScopes@groups.io
Subject: Re: [TekScopes] PG506 in need of parts T130

I measured 5M ohm resistance between the windings and I understand you cant trust that with the part in circuit so I did unsolder the leads however I left it in place when I retested. After reading your reply I decided to double check my work and I should have pulled the part free from the board. I have seen people test parts in place after desoldering on youtube, but my hand must be too heavy and I complete the circuit. I pulled it free and its a dead short now, I think it is ok. However on the board there is now 1M ohm resistance between say the pin locations 1 and 10.


Re: PG506 in need of parts T130

Timothy
 

I measured 5M ohm resistance between the windings and I understand you cant trust that with the part in circuit so I did unsolder the leads however I left it in place when I retested. After reading your reply I decided to double check my work and I should have pulled the part free from the board. I have seen people test parts in place after desoldering on youtube, but my hand must be too heavy and I complete the circuit. I pulled it free and its a dead short now, I think it is ok. However on the board there is now 1M ohm resistance between say the pin locations 1 and 10.


Re: Suggestion for our group Administrator

pdxareaid
 

this is my last post on this. i was not leaning at first but am now.
i think we all know we are using yesterday's technology. sure there is much better and i would prefer we use it.
however, this is a legacy forum and the folks with the most knowledge likely would prefer
not to have editing since they are using the email interface.

if that is true, out of respect and to insure this is a place welcoming to those who know the most, i'm for
keeping the email interface to their liking.
if there is a workaround to allow both manageable email and editing, then great.
short of that keep what was decided on for the transition from yahoo.


Re: Suggestion for our group Administrator

 

My bad experience of groups that enable editing is that 30% or more of posts get 3-5 edits each which more than doubles the message flow.

So my vote is no.

D.

-----Original Message-----
From: TekScopes@groups.io <TekScopes@groups.io> On Behalf Of saipan59 (Pete)
Sent: 11 September 2021 18:10
To: TekScopes@groups.io
Subject: Re: [TekScopes] Suggestion for our group Administrator

My 'vote' is also to turn on editing, and to suggest (for those that care) to use digest e-mails so that you don't get many individuals per day.
I don't expect that post-editing will happen 'frequently' anyway. And it feels better than creating *another* post to correct a mistake.

Pete


Re: Suggestion for our group Administrator

Dave Voorhis
 

On 11 Sep 2021, at 18:09, saipan59 (Pete) <saipan1959@...> wrote:

My 'vote' is also to turn on editing, and to suggest (for those that care) to use digest e-mails so that you don't get many individuals per day.
I don't expect that post-editing will happen 'frequently' anyway. And it feels better than creating *another* post to correct a mistake.
Unless it’s a different Groups.io <http://groups.io/> forum I’m thinking of, wasn’t editing turned on in the early days of using Groups.io <http://groups.io/>, and didn’t that result in a barrage of emails from a few folks who quite reasonably made frequent edits to their forum posts, but weren't aware it was pumping out emails?

Though maybe that facility has been improved since to only send one email per post per day, or some such.


Re: Suggestion for our group Administrator

saipan59 (Pete)
 

My 'vote' is also to turn on editing, and to suggest (for those that care) to use digest e-mails so that you don't get many individuals per day.
I don't expect that post-editing will happen 'frequently' anyway. And it feels better than creating *another* post to correct a mistake.

Pete


Re: Suggestion for our group Administrator

Renée
 

I consider it a blessing that it is not available.
personally nothing is broke lets not fix it till it is broken or so bloated it runs slow.
btw the list works great when using an external editor ( ie thunderbird or claws)...I know too much trouble for some.
Renée

On 9/11/21 9:36 AM, Dave Voorhis wrote:
On 11 Sep 2021, at 16:03, Carsten Bormann <cabocabo@...> wrote:

On 2021-09-11, at 16:47, Michael W. Lynch via groups.io <mlynch003@...> wrote:
Made me laugh! I don't believe that even the most ardent "pro edit" folks would advocate for adding emojis and GIF's to a "list of features”!
Emojis are not a feature, they are a fact of life 😁

I don’t know what you mean by GIFs (animated ones maybe?) — but since TekScopes does not allow any images, we also don’t get GIFs.
But that is a bug, not a feature.
I’d consider that a feature, not a bug. :-)




Re: Suggestion for our group Administrator

Keith
 

re: editable posts

I'm with Jim on this one. Here's why

The data and ideas we post here are quite long-lived. I routinely search out old threads, hoping for correct and trustworthy answers. I then quite often trust, and apply the claims and advice present therein. But, in doing those searches, I do sometimes find howlers in there, my own and others! In the current model, the person who is quite wrong (like me, sometimes) but also quite convinced when they hit "post", simply has no way to make good on his or her mistaken idea. That is, except to post another tiresome explanation of the thing, admitting, warning others "not to read post #xyz123" etc. It is not efficient.

And, when those old posts cannot be corrected, except by re-posting and/or deleting, it just doesn't seem to be building a clear and trustworthy library for future readers. So, just my opinion here, but the long life of mistaken or less-than-best-thinking postings tends to spread mistaken ideas... and it is hard figure out which ones are right and which are wrong. That is, unless one wishes to follow the entire (sometimes extensive) thread and "find" that the misstatement was corrected twenty five messages later. This can be very frustrating and time-consuming.

So that's why I think Jim makes a good point.

But, whatever the admins decide, I want to stress that I'm very VERY grateful for this forum and especially its administrators! Such a depth of wisdom, knowledge and a willingness to share amongst so many is fabulous. I know I've grown and learned so much simply by reading and following the ideas and threads of some very bright and gifted men and women here on the forum.

Deep and sincere thanks to every person who has sacrificed and contributed as an administrator. Your excellent stewardship has kept this forum viable. You are very much appreciated.

Keith
coolblueglow


Re: Suggestion for our group Administrator

Dave Voorhis
 

On 11 Sep 2021, at 16:03, Carsten Bormann <cabocabo@...> wrote:

On 2021-09-11, at 16:47, Michael W. Lynch via groups.io <mlynch003@...> wrote:

Made me laugh! I don't believe that even the most ardent "pro edit" folks would advocate for adding emojis and GIF's to a "list of features”!
Emojis are not a feature, they are a fact of life 😁

I don’t know what you mean by GIFs (animated ones maybe?) — but since TekScopes does not allow any images, we also don’t get GIFs.
But that is a bug, not a feature.
I’d consider that a feature, not a bug. :-)

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