Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 1821233 times)

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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36150 on: August 03, 2019, 08:27:42 pm »
The Heath OL-1 again. I thought I was done with this one. Not so fast. :-// After I put it in the case within 15 minutes the LM350 VR for the filament supply overheated and shut down. I had a feeling that was going to happen. So today I moved the LM350 to the rear plate. That fixed the overheating. It now has plenty of heat dissipation. It's been powered on inside the case for over an hour with no issues. I also took the opportunity to add another 10uf to the B+ supply. You have to be careful here. Adding too much capacitance puts added stress on the 6X4 rectifier and you can blow it out. The scope's B+ supply really should have had a filter choke design to minimize the ripple but Heath decided not to go that route. So it is what it is but the trace looks decent.

Did some quick response tests. Heath specs the -3db point at 200kHz. Yep, as soon as you hit 200kHz you can see it start dropping off. It also specs -6db at 400kHz. Sure is. By that point the sine wave is half the size it was at 200kHz. So at least after 60+ years it meets it's specs.

Now it REALLY is done.  :-+

« Last Edit: August 03, 2019, 08:29:55 pm by med6753 »
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Offline tautech

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36151 on: August 03, 2019, 09:03:53 pm »


You sonuvabitch... you've been holding out on me!!!  All those times you posted those pics of tortured cables just to torque my turkey... and here you have a nice little Pomona-style cable-rack, all full of happy little UN-TORTURED cables... and one that by all appearances was crafted by your own hand!!!

You crusty, agitating, ornery old COOT!!!  :-DD

mnem
Oh yeah... nice job incorporating the TEA into your living space. Looks almost civilized. :-+

Guilty as charged. And proud of it.  >:D :-DD Keep'em on their toes and keep'em guessing.  :P :P
A variant of that:
Treat them like mushrooms: Keep them in the dark and feed them on bullshit.  >:D
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36152 on: August 03, 2019, 09:35:27 pm »
Well you know you've got the kids right when the postman arrives and the six year old points to your delivery and says "toroids"  :-DD   As for living space, living room corner it is for me. Keeping it tidy is an art though. And I'm not an artist  >:D

   Edit: and for some RS "description craziness"  :-//
The writer was suffering from  letting his mind go walk about while compiling the catalogue  :-DD :-DD :-DD
Or he had ball-pein hammers on his mind because one had been liberally applied to his brainpan...  :-DD

mnem
Step 3: "Apply cluebrick; test for compliance. Repeat as necessary."
As has your MB FFS, that is not good, is it working OK when in the case or not? I'd be inclined to take it back and swap it over, that's an accident waiting to happen right there.  |O

I've installed a MB in a $10000 server which looked as bad, at direction of the manufacturer on the phone. If they're not worried about a little warpage, I'm not. This sits on a full set of 7mm standoffs (unlike some of the iTX and microATX MBs that sit on like 3 plus a couple plastic clippies) so not likely going to short out; I expect the board will eventually flatten out.

I was mostly just kvetching about the PITA of having to take it out and double-check for obstructions.  ;)

mnem
*build-ity build-build... build-ity...*
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36153 on: August 03, 2019, 09:41:43 pm »
I've seen heavily populated circuit boards look like they are warped many times due to the lack of mounting support and the weight of the components. It's not an issue and should be OK once properly mounted and supported.
An old gray beard with an attitude.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36154 on: August 03, 2019, 10:20:16 pm »
Agreed.  :-+

But I know the difference; not my first rodeo. The PCB is definitely warped, and there was enough "springback" tension I was really concerned I might have had something stuck under the MB.

Now making the "+4-pin" ATX power cable...

mnem
 ;D
 

Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36155 on: August 03, 2019, 10:33:22 pm »
Agreed.  :-+

But I know the difference; not my first rodeo. The PCB is definitely warped, and there was enough "springback" tension I was really concerned I might have had something stuck under the MB.

Now making the "+4-pin" ATX power cable...

mnem
 ;D
I was coming at it with the assumption that it became warped due to the soldering process and that during the mounting and subsequently being used, applied a stress in the opposite direction on joints and or components causing at a later date failure of the board. 
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Offline GreyWoolfe

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36156 on: August 03, 2019, 10:40:48 pm »
There is no end of this road, is it?  :palm:   ::)  :D

You can check out any time you like, but you can never leave. :-DD

Hotel California, The Eagles, in case you don't get the reference.
That which doesn't kill you still requires a co-pay.
 

Online xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36157 on: August 03, 2019, 10:41:56 pm »
Okaaaay... no, there isn't something jamming up under the MB or effed up in the case... my new MB is just warped AF.

Do not try and bend the Motherboard - that's impossible. Only try to realize the truth - there is no Motherboard.

Then you'll realize it is not the Motherboard that bends, it is only yourself.

 :-DD
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Online Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36158 on: August 03, 2019, 10:54:22 pm »
You can check out any time you like, but you can never leave. :-DD

Hotel California, The Eagles, in case you don't get the reference.
I hate this ride. Lust after a nice piece of gear and finally hunt down a good deal and buy it. Be happy for a week or two. Enthusiastically read up on the subject matter. Find out there's more to be had. Slowly come to the realisation your prize isn't all that and there's bigger fish. Lust after a nice piece of gear..
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36159 on: August 03, 2019, 11:26:32 pm »
Agreed.  :-+

But I know the difference; not my first rodeo. The PCB is definitely warped, and there was enough "springback" tension I was really concerned I might have had something stuck under the MB.

Now making the "+4-pin" ATX power cable...

mnem
 ;D
I was coming at it with the assumption that it became warped due to the soldering process and that during the mounting and subsequently being used, applied a stress in the opposite direction on joints and or components causing at a later date failure of the board.

Agreed AGAIN.  :-+ In principle.  ;)

But I am at the point now where I'm much more concerned about getting it done. My perspective is that the MFR 3-year/30-day OTC warranty is more than reasonable, and such failure is definitely "manufacturing defect" related.

mnem
But I may buy a Squaretrade for it once it goes live. ;)

 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36160 on: August 03, 2019, 11:30:33 pm »
Okaaaay... no, there isn't something jamming up under the MB or effed up in the case... my new MB is just warped AF.

Do not try and bend the Motherboard - that's impossible. Only try to realize the truth - there is no Motherboard.

Then you'll realize it is not the Motherboard that bends, it is only yourself.

 :-DD

I too am warped AF; therefore we must complement each other.  >:D

mnem
Or cancel each other ou... *~POOF!~*
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36161 on: August 03, 2019, 11:33:46 pm »
I hate this ride. Lust after a nice piece of gear and finally hunt down a good deal and buy it. Be happy for a week or two. Enthusiastically read up on the subject matter. Find out there's more to be had. Slowly come to the realisation your prize isn't all that and there's bigger fish. Lust after a nice piece of gear..

Oh, but you haven't even TOUCHED the surface of "The Ride"; eventually you start looking for... ACCESSORIES.  :scared:

mnem
You're welcome.  >:D
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36162 on: August 03, 2019, 11:41:58 pm »
Better than finally get that bastard you want and then it’s broken  :-DD
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36163 on: August 03, 2019, 11:51:47 pm »
Better than finally get that bastard you want and then it’s broken  :-DD

Oh snap!  :-DD

The Tek gods put a jinx on you.  ;D
An old gray beard with an attitude.
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36164 on: August 04, 2019, 12:47:21 am »
Ended up pulling the trigger on a 13" lenovo "thinkpad", to use as a dedicated machine for running GPIB instruments and stuff. First job? Completely fresh Windoze install, to remove any and all crapware. At least, unless there's some "extra features" at the hardware level.  :palm:  :-DD
 
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Offline Whales

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36165 on: August 04, 2019, 12:52:40 am »
Okaaaay... no, there isn't something jamming up under the MB or effed up in the case... my new MB is just warped AF.  :palm:

This is completely normal.  Typically the CPU cooler mounts+screws+force are the primary source of this distortion.  Most motherboards out there are like this, just in varying amounts.  Some have better rear-metal brackets to counteract it, others (like a pentium D rig I have under my bed) look like a banana.

Online xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36166 on: August 04, 2019, 12:56:54 am »
Ended up pulling the trigger on a 13" lenovo "thinkpad", to use as a dedicated machine for running GPIB instruments and stuff. First job? Completely fresh Windoze install, to remove any and all crapware. At least, unless there's some "extra features" at the hardware level.  :palm:  :-DD

Kool. I really need to get back into some GPIB control of my stuff. Did quite a bit when I was working with LabVIEW.
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Online Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36167 on: August 04, 2019, 01:01:01 am »
This is completely normal.  Typically the CPU cooler mounts+screws+force are the primary source of this distortion.  Most motherboards out there are like this, just in varying amounts.  Some have better rear-metal brackets to counteract it, others (like a pentium D rig I have under my bed) look like a banana.
I assume it's under your bed to keep you warm on those long winter nights?
 

Online Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36168 on: August 04, 2019, 01:05:21 am »
Oh, but you haven't even TOUCHED the surface of "The Ride"; eventually you start looking for... ACCESSORIES.  :scared:

mnem
You're welcome.  >:D
My trick is to keep funds low by perpetuating the cycle. I have a long list of wanted accessories, but devices have right of way so there's never funds to be allocated to them.
 

Offline bitseeker

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36169 on: August 04, 2019, 02:48:18 am »
TEA is really a plague!  |O

Once I sneaked around ebay (yes, here the evil starts) I stumbled over a
HP 3460A meter. A 6 1/2 digit nixe tube digital voltmeter for EUR 120.- in "for parts only / defect" condition.

I couldn't resist and pulled the trigger.  :scared:
Now I can't wait until it arrives.  :palm:  :-DD

This is the evil thing:
https://www.ebay.com/itm/202722194710

picture of it:


I hope that the surprises won't be that nasty. We'll see.

It comes with no power cord and it has this weird oval HP connector.
But, surprisingly, a guy is offering some of those cords, so I ordered two of them:

https://www.ebay.com/itm/202531165401

Picture:


Now I'm looking for a service manual which doesn't cost a fortune for shipping...

There is no end of this road, is it?  :palm:   ::)  :D

Now that you're properly on-board, I shall re-welcome you to the TEA house. :-DD
I TEA.
 
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Offline Neomys Sapiens

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36170 on: August 04, 2019, 04:25:20 am »
Ended up pulling the trigger on a 13" lenovo "thinkpad", to use as a dedicated machine for running GPIB instruments and stuff. First job? Completely fresh Windoze install, to remove any and all crapware. At least, unless there's some "extra features" at the hardware level.  :palm:  :-DD
Which one did you get? And which 'windoze'?
 

Offline Neomys Sapiens

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36171 on: August 04, 2019, 04:32:48 am »
Here's a mission for y'all, if you choose to accept it.

I'm restoring a Yokogawa 2554 DC volt/current standard and I need new banana jacks as the screw-down bits are missing on mine...

Problem is, they are a bit of a strange looking type.
If anyone has seen something like this or knows what the manufacturer/part number is, let me know! This device is working really well so far otherwise after a little tweak of the trimpots (I think I'll replace some of the single-turn with multi-turn so I can really dial it in), so it'll be awesome to get it all 100% complete if I can...
A good guess: they are probably Japan-made non-catalogue parts manufactured by a small shop for Yokogawa. Best method might be pestering Yokogawa until they tell you. Then pester the source.
Of course I could be wrong. But that would fit the local mode of operations most closely.
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36172 on: August 04, 2019, 04:49:07 am »
Ended up pulling the trigger on a 13" lenovo "thinkpad", to use as a dedicated machine for running GPIB instruments and stuff. First job? Completely fresh Windoze install, to remove any and all crapware. At least, unless there's some "extra features" at the hardware level.  :palm:  :-DD
Which one did you get? And which 'windoze'?

L380 and Win10 Pro. First thing I did was boot from the usb the pro license came with and obliterate the existing install.  :-+
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36173 on: August 04, 2019, 04:58:59 am »
Ended up pulling the trigger on a 13" lenovo "thinkpad", to use as a dedicated machine for running GPIB instruments and stuff. First job? Completely fresh Windoze install, to remove any and all crapware. At least, unless there's some "extra features" at the hardware level.  :palm:  :-DD
Which one did you get? And which 'windoze'?

L380 and Win10 Pro. First thing I did was boot from the usb the pro license came with and obliterate the existing install.  :-+

Wouldn't one of the Linux distros have been a better choice?   :-//
An old gray beard with an attitude.
 

Offline mindcrime

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #36174 on: August 04, 2019, 05:55:32 am »
Finally dragged the two hand-held multimeters out of storage... they'd been packed away in a toolbox that I used to keep parked at the hackerspace down the street. But now that my home setup is finally coming together, it seemed appropriate to pull them out and complete the family (the 3rd member is my Rigol DM3068 bench meter).









Sadly, the older Radio Shack meter seems to be pining for the fjords... it is an ex-multimeter.  Tried it out earlier and it would power up and the LCD would display digits, with one digit blinking, and it would beep when you changed ranges or functions. But beyond that, nada. No resistance measurement, no continuity test, no voltage measurement, nothing.

I tried fresh batteries, then opened it up and looked for obvious signs of damage... nothing but some corrosion on a couple of the battery contacts. Cleaned that off with sandpaper and isopropyl alcohol, but still the same. Tested the fuse, that was good.  Finally pulled the main board out, and found some electrolytic caps, but no bulging or obvious signs of problems. And I don't have an ESR meter.  I wound up desoldering one of them just for the shits and giggles of it, and it measured OK using the DM3068 at least. And for further shits and giggles, I replaced that cap with a brand new one with identical specs and buttoned the whole thing back up. And now it's even deader than it was!   :-BROKE |O

To be fair, I did knock a ground wire loose during my surgery attempt, and while I *think* I soldered it back to the same spot, I can't be 100% sure.  Anyway, since you can buy a better meter for like $10.00 these days, I'm giving up on that one, even though I have a bit of a sentimental attachment to it. I've probably had that meter for 25 years or so.   :'(

To make up for the loss, I jumped on Amazon and ordered a cheapo no-name TRMS 6000 handheld meter.  :-DMM  And a new USB microscope.   :-+


 


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