Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1704939 times)

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Offline bitseeker

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Re: OT: No Dumber Than Acid-Washed, Less Poopy Than a Porcine Piano
« Reply #36575 on: August 09, 2019, 10:34:13 pm »

www.dresdencodak.com


The advice in the penultimate frame has been working here, too: "TEA-less conversation should pique interest but never dwell on the controversial."
I TEA.
 
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Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36576 on: August 09, 2019, 10:55:06 pm »
Thinking about hitting this. https://probemaster.com/design-your-own-probe-kit/

Anyone got any probemaster probes to review?

I have two sets of the 8000 series probes with 8018S retractable-shroud banana plugs for my bench DMMs. I also got a pair (red & black) of 8050 sprung hooks for each set of probes.

They work great with both standard and safety banana jacks and the tips are super sharp (quite adept at drawing blood).
I TEA.
 
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Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36577 on: August 09, 2019, 11:11:34 pm »
I would work from the shutdown /fault circuitry back here. If you look at the bottom right hand bit of the primary SMPS portion in the service manual, there's a voltage sampling network that should reveal some clues. I haven't LTspiced it but it looks like it's a divider that sums to zero if it's working properly. Anything that doesn't add up trips the fault sense on U1275. You should be able to work back from that to a rail.

If that's fine then the problem may be on the primary side of the SMPS.



Edit: sums to something other than zero by the looks or it's a current summing junction.

Edit 2: I was right. If fault input to U1275 is >200mV for more than 10ms it will shut the supply down. Start there and work back. Read fault protection section 3-55. Interesting design.

My head is spinning from trying to make sense of the schematics on a screen...I need a break...
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36578 on: August 09, 2019, 11:21:41 pm »
I would work from the shutdown /fault circuitry back here. If you look at the bottom right hand bit of the primary SMPS portion in the service manual, there's a voltage sampling network that should reveal some clues. I haven't LTspiced it but it looks like it's a divider that sums to zero if it's working properly. Anything that doesn't add up trips the fault sense on U1275. You should be able to work back from that to a rail.

If that's fine then the problem may be on the primary side of the SMPS.



Edit: sums to something other than zero by the looks or it's a current summing junction.

Edit 2: I was right. If fault input to U1275 is >200mV for more than 10ms it will shut the supply down. Start there and work back. Read fault protection section 3-55. Interesting design.

My head is spinning from trying to make sense of the schematics on a screen...I need a break...

You and me both.  :-DD This 485 has got my panties in a knot and I need to break away and continue tomorrow.  |O ;D
An old gray beard with an attitude.
 
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36579 on: August 09, 2019, 11:31:48 pm »
Dang it’s 00:30 here and I’m still going strong  :-DD
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36580 on: August 09, 2019, 11:43:54 pm »
Dang it’s 00:30 here and I’m still going strong  :-DD

So what do you want? A metal?  :P :P :-DD

Edit....going to chill out with some Netflix.
An old gray beard with an attitude.
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36581 on: August 10, 2019, 12:34:56 am »
I would work from the shutdown /fault circuitry back here. If you look at the bottom right hand bit of the primary SMPS portion in the service manual, there's a voltage sampling network that should reveal some clues. I haven't LTspiced it but it looks like it's a divider that sums to zero if it's working properly. Anything that doesn't add up trips the fault sense on U1275. You should be able to work back from that to a rail.

If that's fine then the problem may be on the primary side of the SMPS.



Edit: sums to something other than zero by the looks or it's a current summing junction.

Edit 2: I was right. If fault input to U1275 is >200mV for more than 10ms it will shut the supply down. Start there and work back. Read fault protection section 3-55. Interesting design.

My head is spinning from trying to make sense of the schematics on a screen...I need a break...

You and me both.  :-DD This 485 has got my panties in a knot and I need to break away and continue tomorrow.  |O ;D

I'm just going to print the relevant portions of the manual to make my life easier.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36582 on: August 10, 2019, 12:52:06 am »


It's been a bit of a wringer, but I've completed my Tune & benchmarks; the full article is up here.   I ramble a bit & lots of pics, so I'm just gonna post the chart & synopsis here.

The TL/DR: Some decreased small file read performance and med-small file write performance and longer RAID Boot times compared to single-channel connected. Otherwise, these $59 SSDs produced very comparable numbers to premium PCIe3.0 drives costing 2x as much, and in RAID, comparable to (In some cases, far exceeding) PCIe4.0 drives costing 5x as much. Definitely a worthwhile experiment.


mnem
 
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Offline wch

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36583 on: August 10, 2019, 02:02:16 am »
I would work from the shutdown /fault circuitry back here. If you look at the bottom right hand bit of the primary SMPS portion in the service manual, there's a voltage sampling network that should reveal some clues. I haven't LTspiced it but it looks like it's a divider that sums to zero if it's working properly. Anything that doesn't add up trips the fault sense on U1275. You should be able to work back from that to a rail.

If that's fine then the problem may be on the primary side of the SMPS.



Edit: sums to something other than zero by the looks or it's a current summing junction.

Edit 2: I was right. If fault input to U1275 is >200mV for more than 10ms it will shut the supply down. Start there and work back. Read fault protection section 3-55. Interesting design.

My head is spinning from trying to make sense of the schematics on a screen...I need a break...

You and me both.  :-DD This 485 has got my panties in a knot and I need to break away and continue tomorrow.  |O ;D

I have to say that tracking this conversation has not made me any more enthusiastic about cracking open the 485 I have sitting in the repair queue.   :o
proceed until apprehended
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36584 on: August 10, 2019, 02:19:36 am »
I don't know what I did, but something I did while fiddling with it fixed whatever was shorted...pointed to something mechanical maybe?
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36585 on: August 10, 2019, 02:23:04 am »
You stopped drooling on it. :-DD

mnem
*agitating-ily*
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36586 on: August 10, 2019, 02:33:16 am »
You stopped drooling on it. :-DD

mnem
*agitating-ily*
I don't know what I did, but something I did while fiddling with it fixed whatever was shorted...pointed to something mechanical maybe?

Yep, confirmed. Almost has to be mechanical. Started ticking again when I reinstalled the SMPS.
 

Offline mindcrime

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36587 on: August 10, 2019, 02:36:38 am »
I like to keep my background music a little more sedate:




« Last Edit: August 10, 2019, 02:51:32 am by mindcrime »
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36588 on: August 10, 2019, 03:19:49 am »


mnem
*sedated*
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36589 on: August 10, 2019, 03:27:52 am »
I massaged the placement of the fan power...and we are alive!   :-+



 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36590 on: August 10, 2019, 03:35:15 am »
You mean you "nudged" the "fanatic" who was slobbering all over the insides and making all the pixies angry...?

mnem
 :horse:
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36591 on: August 10, 2019, 03:39:02 am »
You mean you "nudged" the "fanatic" who was slobbering all over the insides and making all the pixies angry...?

mnem
 :horse:

That fanatic you speak of touched the HV supply and is now dead.  :-DD
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36592 on: August 10, 2019, 03:55:05 am »
Well, that would definitely make him stop slobbering all over the insides of your Tek. Unless it was med; not sure even THAT would stop HIM...  :-DD

mnem
*tzzzt*
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36593 on: August 10, 2019, 04:28:14 am »
Well, that would definitely make him stop slobbering all over the insides of your Tek. Unless it was med; not sure even THAT would stop HIM...  :-DD

mnem
*tzzzt*

Bite me!  >:D :-DD

An old gray beard with an attitude.
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36594 on: August 10, 2019, 04:47:18 am »
I guess if you get zapped enough you become immune...or a comic book character.  :-DD

Was able to verify that the crt shutdown circuit works correctly. This is a great 'scope, though decidedly a bit more specialized than my 7904A which will continue to sit next to it and see use.
 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36595 on: August 10, 2019, 05:11:51 am »
Well, that would definitely make him stop slobbering all over the insides of your Tek. Unless it was med; not sure even THAT would stop HIM...  :-DD

mnem
*tzzzt*
Bite me!  >:D :-DD

Not even with rented fangs!!!
   :-DD   Also, I notice you are NOT in any way denying...  ;)

mnem
*the human cartoon*
« Last Edit: August 10, 2019, 02:24:55 pm by mnementh »
 

Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36596 on: August 10, 2019, 06:11:50 am »
Cheap USB data logging high Temperature TEA  :) #nobodge

Coffee, Food, R/C and electronics nerd in no particular order :)
 

Offline VK5RC

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36597 on: August 10, 2019, 06:43:20 am »
A great melody. A real war tune.
https://youtu.be/vTkGNcntD7s
've heard them liltin'
At the ewe milkin'
And I've heard them liltin'
Before light a-day
Now they are mournin'
For all time a-liltin'
The flowers of the forest
Are all a' wede away
Sad they for the order
That sent them to the border
The English by guile
For once won the day
Now they are mournin'
For all time a-lilting
The flowers of the forest
Are all a' wede away
Whoah! Watch where that landed we might need it later.
 
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Offline Cubdriver

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36598 on: August 10, 2019, 06:55:24 am »
A few pictures of the Dana 5330.  It definitely needs some work - applying an input voltage gives no corresponding reading, and it randomly drifts around.  It's mid-late '72 vintage, so it may well need filter caps for starters.  It's a bare bones version, DC voltage measurement only.  The AC and resistance selectors are locked out and there is no AC/ohms circuitry in the measurement section.  At least all the nixies appear functional.  Into the queue it goes.

Lab Cat has brushed upon it and granted his purr of approval:








-Pat
If it jams, force it.  If it breaks, you needed a new one anyway...
 
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36599 on: August 10, 2019, 09:45:27 am »
Some good stuff on this thread this week  :-+

Getting fired up to refurb the 6286A metering circuit this morning ... heathy (hahaha) breakfast first

807591-0
 


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