Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 2610586 times)

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Offline tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39525 on: September 23, 2019, 05:05:11 pm »
Finally, snagged the fail. CR772 Tunnel Diode is NFG. Resistance check should read about 5.6 ohms. This one is reading 23 ohms. I verified that with all 5 of the other tunnel diodes between both scopes. This one is FUBAR.

Shit, now starts the search for the unicorn rainbow farts. I guess I'll check normal sources first and then look at the Russian equivalent list and see if that P/N diode cross references.

ISTR statements to the effect that it is prudent to be careful when using a standard diode tester on a tunnel diode. I haven't considered the physics, but the "foldback" mechanism might encourage excessive current.

Apart from that:
https://www.ebay.co.uk/itm/Tektronix-485-diverse-Platinen/254367059209
https://www.ebay.co.uk/itm/Five-Tektronix-152-0177-00-10mA-Tunnel-Diodes/283622200856?hash=item4209335618:g:PfcAAOSwBRFc~ZQT

I used standard resistance test, not diode test. I also pulled one end to verify. It continues to read much higher than the others. I can only assume it's no good. And thanks for the links.

It could also happen with a resistance test, depending on the max "available" voltage. Comparative testing is useful, of course.

I would have considered swapping CR1052 or CD1062 from the B trigger circuit, to see if it works.

I'd also carefullt test/examine the surrounding components, to verify their failure hasn't buggered the TD.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39526 on: September 23, 2019, 06:54:29 pm »
Ok so after much research, I just ordered a Peak LCR45 and not a 3d printer. Well not yet anyway!
 

Offline Wolfgang

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39527 on: September 23, 2019, 06:55:02 pm »
Will everyone stop it with the 3DP stuff. I've got a fat chunk of cash burning a hole in my pocket from "crap clearout", a footless scope and the requirement to make some custom parts. I'm trying not to solve it that was as I'm stuffed for time on everything already :-DD

3D printig is for masochists.
In ads you see perfect parts, the crude junk leaving your printer is another matter.
It took me years to get usable parts out of my 3D machinery. Now I make some, where machining them with a CNC mill is too difficult.
The typical 3D development cycle : enthusiasm - frustration - sobering - pragmatic use without emotions

https://electronicprojectsforfun.wordpress.com/3d-printing-desasters/
https://electronicprojectsforfun.wordpress.com/using-the-keysight-autoprobe-interface-in-your-own-projects/

 
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Offline Addicted2AnalogTek

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39528 on: September 23, 2019, 06:58:05 pm »
I bought one. $30 plus $3.66 shipping plus tax. They are located in NY so should get it quick.

Yea....NOT CHEAP.  :scared:


$30?!?!?

I have the parts unit 485 and a curve tracer and would have been OK parting with a tested used 512-0177-00 for a hell of a lot less than that!
 

Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39529 on: September 23, 2019, 07:00:25 pm »
The typical 3D development cycle : enthusiasm - frustration - sobering - pragmatic use without emotions

My goodness was it that bad an experience for you?  :-//
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 

Offline Wolfgang

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39530 on: September 23, 2019, 07:06:32 pm »
YES, it was. but now I can make decent parts when avoiding all pitfalls.
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39531 on: September 23, 2019, 07:09:46 pm »
You see that's why I can't be arsed. I'd rather ship the file off to someone else to cry at  :-DD
 

Offline tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39532 on: September 23, 2019, 07:27:55 pm »
You see that's why I can't be arsed. I'd rather ship the file off to someone else to cry at  :-DD

Precisely.

Plus you can get it made in a decent materlal, e.g. nylon, SLA, brass, ... :) Or if you are prepared to use a crap material, you can google for "3d printers near X" and find lots of people that think they can make money from their printer.

The only problem is if you are on a tight timescale and need a respin.
There are lies, damned lies, statistics - and ADC/DAC specs.
Glider pilot's aphorism: "there is no substitute for span". Retort: "There is a substitute: skill+imagination. But you can buy span".
Having fun doing more, with less
 

Offline Wolfgang

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39533 on: September 23, 2019, 07:30:03 pm »
You see that's why I can't be arsed. I'd rather ship the file off to someone else to cry at  :-DD
Good idea, I tried that as well. Parts were OK but getting expensive when you wanted non-warp materials.

Now I found a guy in Vienna who took the bet that my parts (flat clamps for my CNC mill) wont warp. He tried dozens of materials, and
all of them did not work. But he never gave up (good guy). After a while, I found a new Chinese stuff that promised almost
zero thermal expansion. He ordered it, tried it out, and it worked. Result: I bought the printer plus the
material from him :) Persistence pays in the end. The guys from Stratasys had no clue.
 

Offline factory

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39534 on: September 23, 2019, 07:35:57 pm »
Your story saved me. Mahalo!  So the 3400A sits on my bench  while I try to find a complete rear panel for it. Rivets.  |O  The weird rounded corner rectangle power socket.  |O  A modern socket won't fit without major metal work that is beyond my skill.  |O

I can see the problem with trying to fit a modern socket to a 1960's 3400A, they had to move the line voltage selector & SN plate up a bit to make room for the larger IEC socket. The newer unit is my parts mule.


Do you have the old power cord? replacement PH-163 sockets aren't too hard to find.
eBay auction: #254240034537 others are available.

David
« Last Edit: September 23, 2019, 07:41:17 pm by factory »
 

Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39535 on: September 23, 2019, 08:42:21 pm »
I bought one. $30 plus $3.66 shipping plus tax. They are located in NY so should get it quick.

Yea....NOT CHEAP.  :scared:


$30?!?!?

I have the parts unit 485 and a curve tracer and would have been OK parting with a tested used 512-0177-00 for a hell of a lot less than that!

Well, if I need another one you'll be hearing from me.  ;D
An old gray beard with an attitude.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39536 on: September 23, 2019, 08:51:40 pm »
Will everyone stop it with the 3DP stuff. I've got a fat chunk of cash burning a hole in my pocket from "crap clearout", a footless scope and the requirement to make some custom parts. I'm trying not to solve it that was as I'm stuffed for time on everything already :-DD

3D printing is for masochists.
In ads you see perfect parts, the crude junk leaving your printer is another matter.
It took me years to get usable parts out of my 3D machinery. Now I make some, where machining them with a CNC mill is too difficult.
The typical 3D development cycle : enthusiasm - frustration - sobering - pragmatic use without emotions

https://electronicprojectsforfun.wordpress.com/3d-printing-desasters/
https://electronicprojectsforfun.wordpress.com/using-the-keysight-autoprobe-interface-in-your-own-projects/

For those playing along at home:

Buy an Ender or Tevo Tornado. You'll fall in love with FDM fabrication all over again.  ;D

I did the same misery² route myself... spent months fucking around with multiple iterations of "PRUSA Kits" until I was ready to shoot the whole industry with the biggest photon torpedo I could find.

Then I helped a friend put together an Ender online and it was literally painless, for both of us. So I got curious and bought its cousin, the Tornado. I was printing usable parts an hour after I opened the box, and that included time spent being anal about cable dress.

If you expect SLA-resolution parts from FDM, you're fucking yourself before you ever start. If you go into it expecting to make parts of similar precision to what a man can make braking sheetmetal or welding structural steel, you will be rewarded with parts that meet or exceed your need.

I forgot to mention the canonical rules of product selection: no Oracle, no Autodesk. Anything else?  :-DD

Then you've fucked yourself before you even begin. Think of Fusion360 the same way you do Winbloze: Tie its feet together to minimize testicular assault, keep local copies of your work and use it until you get close to something that can be marketed, and THEN buy a license.   :o

As with OSes... there is nothing "Free" about it. You either pay with mental fuckery and self-inflicted intellectual torment (the *NIX business model) or you buy into somebody else's ecosystem with your time and/or money.  :-//

Of all the available modeling environs, Fusion360 yields usable models with the fewest CCs of sanguine elixir shed. If I can learn to use it, anybody can.

mnem
*just returned from working outside in the liquid air*
 
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Offline Neomys Sapiens

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39537 on: September 23, 2019, 09:08:09 pm »
Just back... waaaay behind on the thread but I have a good excuse:



Wasn't a wifi or LTE signal within thirty miles of me.  :-+
How much TE did you have to cart up there to be so sure of that?
 
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Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39538 on: September 23, 2019, 09:43:55 pm »
If you expect SLA-resolution parts from FDM, you're fucking yourself before you ever start. If you go into it expecting to make parts of similar precision to what a man can make braking sheetmetal or welding structural steel, you will be rewarded with parts that meet or exceed your need.

Or said another way - get it/use it for what it can do, not for what it can't do.

It makes many useful things of acceptable quality; it also cannot make a great many other things of higher quality.

Take the NanoVNA case I had it make this afternoon. It came out very nice and looks pretty good, and it should be a useful and durable item for my needs. However, I will not be making replacement gears for a Rolex watch tomorrow with the thing - that is unreasonable.

It's like any other tool, if it sucks so bad it cannot do much of anything, I'd agree that tool is worthless. However, that certainly doesn't apply to current FDM machines. Sure they have quirks and learning curves - but didn't we all go through similar things in electronics? I've made a great many things with it - both for serious and fun requirements. I sure wouldn't want to go back to not having one in my room now.

Now for the NanoVNA case - if I only had one to put in it ...  :-DD
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39539 on: September 23, 2019, 10:49:39 pm »
Your story saved me. Mahalo!  So the 3400A sits on my bench  while I try to find a complete rear panel for it. Rivets.  |O  The weird rounded corner rectangle power socket.  |O  A modern socket won't fit without major metal work that is beyond my skill.  |O

I can see the problem with trying to fit a modern socket to a 1960's 3400A, they had to move the line voltage selector & SN plate up a bit to make room for the larger IEC socket. The newer unit is my parts mule.


Do you have the old power cord? replacement PH-163 sockets aren't too hard to find.
eBay auction: #254240034537 others are available.

David

I have the old power cord. The phenolic in the power cord socket is broken. No good way to fix it. There's a couple of 3400As on ebay (with the newer back plate). I am going to buy one at parts mule prices and swap the whole back plate out. Trying to fit an IEC socket into the old style plate is more masochism than I am willing to bear.  ;D
specialization is for insects.
 

Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39540 on: September 23, 2019, 10:53:54 pm »
Just back... waaaay behind on the thread but I have a good excuse:



Wasn't a wifi or LTE signal within thirty miles of me.  :-+
How much TE did you have to cart up there to be so sure of that?

*sigh*  none. so, technically, you are correct. I do not know there was no wifi or LTE signal of thirty miles of my location because I had inadequately equipped myself for finding out.  ;D
specialization is for insects.
 
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Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39541 on: September 23, 2019, 10:57:41 pm »
If you expect SLA-resolution parts from FDM, you're fucking yourself before you ever start. If you go into it expecting to make parts of similar precision to what a man can make braking sheetmetal or welding structural steel, you will be rewarded with parts that meet or exceed your need.

Or said another way - get it/use it for what it can do, not for what it can't do.

It's like any other tool, if it sucks so bad it cannot do much of anything, I'd agree that tool is worthless. However, that certainly doesn't apply to current FDM machines. Sure they have quirks and learning curves - but didn't we all go through similar things in electronics? I've made a great many things with it - both for serious and fun requirements. I sure wouldn't want to go back to not having one in my room now.


I am with you on this one... I don't expect to make precision or high reliability parts. If I learn how to make decent boxes and the doodads that my wife needs to trick out her ikebana arrangements, I will declare victory.

And, BTW, nice job on the case... going to post the 3DP file somewhere for that?  :-+
specialization is for insects.
 
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Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39542 on: September 23, 2019, 11:04:08 pm »
I am with you on this one... I don't expect to make precision or high reliability parts. If I learn how to make decent boxes and the doodads that my wife needs to trick out her ikebana arrangements, I will declare victory.

And, BTW, nice job on the case... going to post the 3DP file somewhere for that?  :-+

I can't take credit for this design but the link is below. However, I may need to adjust it's dimensions a bit if the designer wasn't as anal as I am.  :-DD

https://www.thingiverse.com/thing:3818979
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39543 on: September 23, 2019, 11:22:31 pm »
Like with others fairly recently getting a 3D printer the experience has been fairly painless. Given the homemade Prusa Clone or plywood warby models and the pain of ABS of only a few years ago it is now affordable and easy to buy, build and use a printer.

Now I have material and slicing profiles where I want them it is simple reliable and just plain works. It is never going to be a perfect solution but for one offs and fiddly jobs it is so much better than what can be achieved by the average mortal.

Last job on the ender was literally 30 minutes of Cad time and an hour per bracket while I had a few beers and made dinner. https://www.eevblog.com/forum/chat/3d-printer-yet/msg2703118/#msg2703118

How much time and what would the result have looked like made by hand otherwise?
Coffee, Food, R/C and electronics nerd in no particular order :)
 
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Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39544 on: September 23, 2019, 11:28:22 pm »
Damn you people. I'm looking at 3d printers now.
 

Offline Neomys Sapiens

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39545 on: September 23, 2019, 11:43:03 pm »
Damn you people. I'm looking at 3d printers now.
I would have to start by looking at workshops or warehouses - so I desist.
 :phew:
 

Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39546 on: September 24, 2019, 12:37:17 am »
Takes about 12RU of valuable TEA space to fit in an Ender3 so it is a consideration  ;)
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Online Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39547 on: September 24, 2019, 03:28:03 am »
Modern day Prusa stuff apparently is pretty good. There obviously was a lot of trial and error done to get to where we are now.
 

Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39548 on: September 24, 2019, 03:54:09 am »
Should have clarified 'Prusa' I was meaning the earlier DIY like this below. Team this with suspect mechanics, belts etc and any wonder it was boffin level to get a decent print likely using ABS.



You can always jump further into the CNC Hole. Todays mock up for likely aluminium job by a big boy Laser was this panel. Still two pots to be added and some text but for the sake of <$1 worth of ply worth it for a stepping stone. Maybe could have been done in high temp plastic and 3D printed but the top edge on the old panel used to hit 70C+ and was still over 50C at the PID and timer. In ply it will work for a few weeks while I play with a final layout and the extinguisher is within arms reach  ;)

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

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #39549 on: September 24, 2019, 04:11:01 am »


Whaaaaat...?

Damn you people. I'm looking at 3d printers now.

Yoooooou're welllllllllcommmmme!!!  >:D

Takes about 12RU of valuable TEA space to fit in an Ender3 so it is a consideration  ;)

You fucking psychotic ozzie wag you... literally made me snort iced tea all over myself. I only narrowly (and completely by accident) avoided drowning the keyboard I just repaired the other day!!!  :P

mnem
*toddling off to ded*
« Last Edit: September 24, 2019, 04:19:34 am by mnementh »
 


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