Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 3134346 times)

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Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59850 on: May 30, 2020, 02:57:18 pm »
Bench power supply / supplies and a Suitable current limiting resistor. They can have 20v drop across them easily.

Measure V across diode to get voltage drop and measure V across R to get whether or not the diode is fucked.

OK, what size current limiting resistor should I start with?

I would work on current first so stick a 1k resistor and ammeter in series and slowly ramp up the supply voltage until it reads 2mA or so in the right direction. It probably won’t do a lot until at least 10-20V.

Try it on a good diode first to make sure it works.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59851 on: May 30, 2020, 02:58:31 pm »
umm, no, have not done so. I am not setting up that many Windose thingies these days.   BTW it's running now, VS2019 and VSCode installed.   need to grab one cheap stick of ddr4 2133 to bring it to 64GB 4way which should help big time.  Decent Home Computer eet eeez.

The biggest problem is finding all those drivers. I have no intention to toss my bloody expensive scanners, cameras, and stuff.

That, unfortunately, is precisely where "the devil is in the details" makes its bailiwick.  :palm:

I'll cast a prayer to Ifni for your sanity, my dear.  ;)

I will admit one thing... once you get used to the "shades of grey" color scheme and loss of 3D radio buttons (YES, I know this DOES take some getting used to); the improvement in contrast & clarity over Win7 makes it so that I cringe a little when I have to go back to my old ToughBook.

Add that to the complete Charlie-Foxtrot later Service Packs made of Win7's HAL... let's just say there's a REASON I bit the bullet (okay, in part because I HAVE TO BE familiar with the current versions of Windoze, as knowing how to fix it is my stock-in-trade) and learned how to, as bd says, "Tie it's feet together so it can't kick me in the balls all the time".

I don't know how much of the frontend is in your job description... but Win8 & up interact differently with the EU and with the domain... this MIGHT be something you need to bite the bullet on as well. :-//

Good luck,

mnem
 :-/O
« Last Edit: May 30, 2020, 03:02:26 pm by mnementh »
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59852 on: May 30, 2020, 03:00:31 pm »
Yep windows 7 is quite frankly “fucking horrid” now.
 
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Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59853 on: May 30, 2020, 03:06:39 pm »
Bench power supply / supplies and a Suitable current limiting resistor. They can have 20v drop across them easily.

Measure V across diode to get voltage drop and measure V across R to get whether or not the diode is fucked.

OK, what size current limiting resistor should I start with?

I would work on current first so stick a 1k resistor and ammeter in series and slowly ramp up the supply voltage until it reads 2mA or so in the right direction. It probably won’t do a lot until at least 10-20V.

Try it on a good diode first to make sure it works.

OK, thanks. In order to get those two HV boards out to check the resistors I have to unsolder all that wiring.  :wtf: :palm:
An old gray beard with an attitude.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59854 on: May 30, 2020, 03:08:02 pm »
I’ve found this as well, but the last time I said anything to that effect I got dogpiled for using/suggesting folks use “contaminated” IPA. So now I just keep my mouth shut, and keep a spray bottle of each on the bench.  ;)

mnem
 :popcorn: :popcorn: :popcorn:
Oh no, are you feeling feverish, have a headache, loss of taste and smell? You must be suffering from CVD19 (sounds of a klaxon horn going off to alert everyone). This is not the mnem that all know and love, can't be, keeping mouth shut  :palm: >:D Get well soon please old buddy, its discord day today  :-DD :-DD :-DD

Ehhh... I keep my mouth shut about a LOT of things; YOU HAVE NO IDEA how hard it is sometimes.  >:D 

mnem
Old age has taught me to choose my battles; there's more than enough misery to go around without grabbing for more. :-DD
 
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Offline Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59855 on: May 30, 2020, 03:12:22 pm »
I've always remembered and applied a concept from James Clavell's "Noble House". A character in that novel, a lady executive has the objective to have “drop dead money”. The “drop dead money” is that amount of money that she calculates she needs so that she would have the freedom and the luxury to tell anyone to “drop dead” without worrying about her financial security.
Financial independence is something often discussed with friends. It can be a difficult balance. It's tempting to work towards the drop dead point with all your might except that if you were to drop dead beforehand, it's been all for nought and you may not have spent your time wisely. Finding the balance between now and future can be a challenge, although not continuously dealing with the now due to a lack of resources or unwise use of available resources is a great first step.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59856 on: May 30, 2020, 03:15:20 pm »
@ BU508A: Condolences from the Dwagon's Cave as well, my friend.

mnem
"Time is a man's most precious resource; the one thing you can't buy, beg, borrow or steal." ~me

 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59857 on: May 30, 2020, 03:22:16 pm »
Today I did the hot air gun repair to the 4503 meter and I'm very pleased to report that it worked a treat, suspect joints that under a microscope appeared to be flawed on the component side of the board (2 layer board) where perfect on the solder side and after treating the top of those joints with rosin and gently warming with the hot air gun, the joints flowed nicely. However, there were 2 slight casualties, 2 polyester caps 22nF each used as HF filters had their outer cases slightly blistered, but still work OK. I'll get these replaced soon with new ones arrive.

The residual 9Meg that resistance ranges were seeing has now completely been cured and the meter calibrated and is in complete agreement my other meters, "winner winner chicken dinner" as Dave would say. The photos below show it in resistance range with open leads and also measuring 4 x 10M resistors soldered together quickly to test the meters capability.
You can use Kapton tape to shield surrounding components.
Yes I could, I have some but the caps were some of the suspected bad joints that I needed to reflow from the top side and no way of getting on iron tip in there without actually touching them and other items.

Alternately, you can use the silicone rubber mat they give you for changing the tips on your MetCal as a heat shield; I've done it many times.  :-+

Yeah, you've learned here the hard lesson of hot-air rework: Attack one problem at a time. Trying to get two birds with one stone often leads to eating burned feathers instead.  :-DD

mnem
I can mix metaphors with the best worst of 'em...
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59858 on: May 30, 2020, 03:27:06 pm »
   Incoming, hopefully arriving soon is another AVO model 8, Mk5, complete with all leads, manual and also a clamp on amp probe, a bit grubby but it will clean up nicely. Seller is a retired electrical engineer having a clear out to save his son from having it to do when the time comes, in other words a pre SK sale. This will bring my tally of Avo model 8's upto 3. It wont get used all that much, but at the price it would be rude not to and I'm sure that one day these fine lovable meters will escalate in value. :-+

The attached photo is not actual meter, but it is however the same.

Whatcha doin' widdat hot-glue gun & clock gears there, Spec...? And you have it upside-down so it makes the AVO smiley-face... N0000000000000!!!!

mnem
*agitating-ily*
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59859 on: May 30, 2020, 03:31:09 pm »
I've always remembered and applied a concept from James Clavell's "Noble House". A character in that novel, a lady executive has the objective to have “drop dead money”. The “drop dead money” is that amount of money that she calculates she needs so that she would have the freedom and the luxury to tell anyone to “drop dead” without worrying about her financial security.
Financial independence is something often discussed with friends. It can be a difficult balance. It's tempting to work towards the drop dead point with all your might except that if you were to drop dead beforehand, it's been all for nought and you may not have spent your time wisely. Finding the balance between now and future can be a challenge, although not continuously dealing with the now due to a lack of resources or unwise use of available resources is a great first step.

Also your ex wife might try and steal it before you get there  >:(

That’s all I’m going to say on that matter.
 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59860 on: May 30, 2020, 03:34:00 pm »
The Fluke 8125A .. looks pretty nice for age... not sure but from the 70's like me... omg that 50 years??

https://youtu.be/ko6Quk2e-F8

Yes i did open it.. :))

That is a thing of beauty, Tony. Proper military-grade bulldozer-chic right there. ;)

Don't forget to look for and evict any RIFAs and suspect tants... IIRC from another teardown, these have both.

mnem
 :-+
 
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Offline Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59861 on: May 30, 2020, 03:39:22 pm »
Yep windows 7 is quite frankly “fucking horrid” now.
No! Windows 7 is perfect and Windows 10 is a shit show. Those are the rules of the internet. Saying anything else will invoke the mob and a lot of fist shaking.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59862 on: May 30, 2020, 03:40:22 pm »
My first law is simply: time is the only currency worth considering.
I've found that having some other currencies massively helps with having a say over the ultimate currency, although you can easily get lost gathering those other currencies.

I've always remembered and applied a concept from James Clavell's "Noble House". A character in that novel, a lady executive has the objective to have “drop dead money”. The “drop dead money” is that amount of money that she calculates she needs so that she would have the freedom and the luxury to tell anyone to “drop dead” without worrying about her financial security.

Yeah; the concept of "Fu** you money" has been around a lot longer than that novel.  ;)  How much that is greatly depends on the person involved, and how attached they are to their personal comforts and their "things". :-+

mnem
"Freedom's just another word for nothin' left to lose; nothin' ain't worth nuthin, but it's free..."
« Last Edit: May 30, 2020, 03:43:48 pm by mnementh »
 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59863 on: May 30, 2020, 03:43:27 pm »
Yes, it's Saturday. I'll be on Discord at approx 2130 UTC.
I'll do my best to be there and harangue you as usual, buddy. I know how you need your regular dose of aggravation to feel alive.  :-DD

mnem
 >:D
 

Offline Ice-Tea

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59864 on: May 30, 2020, 03:43:41 pm »
Why not just current limit the source?  :-//

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59865 on: May 30, 2020, 03:48:23 pm »
And for those thinking that those drawers contained nothing but crap, one held these gems inside:      I even have an idea where to store the remaining 6 cabinets. ;D

Fuuuuuuu... That's a £1000 worth of AD549s!  (Where's the gobsmacked emoji?)

Page 1140: https://www.eevblog.com/forum/testgear/test-equipment-anonymous-(tea)-group-therapy-thread/28475/

Here ya go, C:   

mnem
"Very helpful... very helpful indeed." Chibila thought to himself...
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59866 on: May 30, 2020, 03:48:48 pm »
Bench power supply / supplies and a Suitable current limiting resistor. They can have 20v drop across them easily.

Measure V across diode to get voltage drop and measure V across R to get whether or not the diode is fucked.

OK, what size current limiting resistor should I start with?

I would work on current first so stick a 1k resistor and ammeter in series and slowly ramp up the supply voltage until it reads 2mA or so in the right direction. It probably won’t do a lot until at least 10-20V.

Try it on a good diode first to make sure it works.

OK, thanks. In order to get those two HV boards out to check the resistors I have to unsolder all that wiring.  :wtf: :palm:

Update....and QService in Greece has 7 of them in stock in case they are bad....or I fubar them.  :-DD
An old gray beard with an attitude.
 

Offline xrunner

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59867 on: May 30, 2020, 03:51:42 pm »
Cleaning, cleaning, cleaning ...  :phew:
I am a Test Equipment Addict (TEA) - by virtue of this forum signature, I have now faced my addiction
 
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59868 on: May 30, 2020, 03:52:04 pm »
Yes, it's Saturday. I'll be on Discord at approx 2130 UTC.
I'll do my best to be there and harangue you as usual, buddy. I know how you need your regular dose of aggravation to feel alive.  :-DD

mnem
 >:D
Why not just current limit the source?  :-//



mnem
« Last Edit: May 30, 2020, 03:54:09 pm by mnementh »
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59869 on: May 30, 2020, 04:02:12 pm »
Cleaning, cleaning, cleaning ...  :phew:   



mnem
 :clap:
« Last Edit: May 30, 2020, 04:07:10 pm by mnementh »
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59870 on: May 30, 2020, 04:11:07 pm »
Bench power supply / supplies and a Suitable current limiting resistor. They can have 20v drop across them easily. Measure V across diode to get voltage drop and measure V across R to get whether or not the diode is fucked.

Yup. That's because they aren't really a single diode, but a long chain of them encapsulated in epoxy.  |O

mnem
 :-/O
 

Online bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59871 on: May 30, 2020, 04:11:33 pm »
Bench power supply / supplies and a Suitable current limiting resistor. They can have 20v drop across them easily.

Measure V across diode to get voltage drop and measure V across R to get whether or not the diode is fucked.

OK, what size current limiting resistor should I start with?

I would work on current first so stick a 1k resistor and ammeter in series and slowly ramp up the supply voltage until it reads 2mA or so in the right direction. It probably won’t do a lot until at least 10-20V.

Try it on a good diode first to make sure it works.

OK, thanks. In order to get those two HV boards out to check the resistors I have to unsolder all that wiring.  :wtf: :palm:

Update....and QService in Greece has 7 of them in stock in case they are bad....or I fubar them.  :-DD

Worth looking at hvstuff.com as well: http://hvstuff.com/high-voltage-diodes-and-rectifiers

 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59872 on: May 30, 2020, 04:12:24 pm »
Bench power supply / supplies and a Suitable current limiting resistor. They can have 20v drop across them easily. Measure V across diode to get voltage drop and measure V across R to get whether or not the diode is fucked.

Yup. That's because they aren't really a single diode, but a long chain of them encapsulated in epoxy.  |O

mnem
 :-/O

Yea, I figured it was something like that.
An old gray beard with an attitude.
 
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Offline Ice-Tea

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59873 on: May 30, 2020, 04:56:44 pm »

Quote
Why not just current limit the source?  :-//



mnem


I either said something incredibly stupid or I produced the Columbus' egg. I honnestly can't figure out which one from your reaction :-DD

Offline Mr. Scram

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #59874 on: May 30, 2020, 05:20:55 pm »
I just spotted what for all the world looks like a 87V while closing the hatch on the Dragon capsule. Looks like they they were using it in the ohms range or continuity mode. Maybe some kind of check to ensure the door's sealed and seated properly? Quite curious.



https://www.nasa.gov/nasalive
« Last Edit: May 30, 2020, 07:42:45 pm by Mr. Scram »
 
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