Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 2873714 times)

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Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42400 on: November 08, 2019, 01:39:26 pm »
the "distorted sine"

 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42401 on: November 08, 2019, 01:41:54 pm »
I bet it's a shaped triangle wave and the triangle source is generating the distortion on switching between source/sink. Could even be power supply issues. Caps not low enough impedance.
 

Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42402 on: November 08, 2019, 01:44:58 pm »
Triangels and rectangles looks OK
 

Online med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42403 on: November 08, 2019, 01:46:03 pm »
There might be a distortion adjustment for the sine wave.
An old gray beard with an attitude.
 

Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42404 on: November 08, 2019, 01:54:12 pm »
I will check the power rails for peaks + pokes, here are more scopes then the apparatus have transistors  8)
 
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Offline Zucca

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42405 on: November 08, 2019, 01:59:00 pm »
Martin if you can't fix it nobody can.
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 

Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42406 on: November 08, 2019, 02:12:56 pm »
My inner VoltNut is saying yes, but my wallet is saying where's the make offer button  :-DD
https://www.ebay.com/itm/254412212863



Better not touch that thing. Could easilly cost you another 2K$ to fix the unit. 3458a parts are super expensive.  :-\

 
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Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42407 on: November 08, 2019, 02:15:07 pm »
My Fluke 1953A arrived, in the usual bomb-proof packaging I've come to expect from this seller. Even having sat for hours in a near-biblical downpour, the TE was dry and undamaged.

Which is not to say there aren't any issues however, the rotary switches clearly need a lot of cleaning, and there's so much instability on the readings I'll have to poke around a bit to figure out what's going wrong.
1MHz square wave:

Fluke says:

and

and

also

and


The fact I can't find my BNC-BNC lead is not helping either   |O

Even considered chopping the ends off a TV aerial lead and soldering BNCs onto it, but decided against it in the end...

At least it comes in the med-approved colour scheme   :-DD


Meanwhile in Canada...
nuqDaq yuch Dapol?
Addiction count: Tektronix-Hameg-Fluke-HP-TTi-Solartron-Thurlby-IsoTech-Black Star-Micronta-Mastech-UniT
 
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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42408 on: November 08, 2019, 03:09:24 pm »
   I think they were "working some shit out" after getting laid off when LucasFilms closed up shop after ROTJ...  :-DD

mnem
 >:D
:-DD I think you're onto something there. Local surplus joint has a stack of thermometer/thermocouple controllers in that some case style. Assume they are largely worthless without the sensors.



No doubt being offered for sale by this guy... :-DD

mnem
med... is that you...?  ;)
« Last Edit: November 08, 2019, 03:13:27 pm by mnementh »
 

Offline 0culus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42409 on: November 08, 2019, 03:13:22 pm »
I won't say there isn't a resemblance between them.  >:D
 

Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42410 on: November 08, 2019, 03:13:44 pm »
Hey @med I found another meter you could stack on your ugly duckling Fluke. Even painting it blue wouldn't help   :-DD eBay auction: #401819975598



All the nay sayers.  :P I think it's cool. :-+  It's in the same case design as my 7260A Frequency Counter.

And yes.....I would paint it blue.  :-DD



That's the standard issue look from the  "every box must look like a short distance transporter from star trek" industrial design era.   ;D
bark less, wag more.
 
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Offline worsthorse

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42411 on: November 08, 2019, 03:15:58 pm »
Back to TEA, why the previous owner is always a moron?
(Attachment Link)

My PITA Points:

1) the two elco caps on the top are not deformed but smaller in diameter than what they should be.
2) the big ass blue (dedicated to med) elco cap is not stripped down with a zip tie to the board
3) the relocation of the T220 is nice for thermal but I do not like the execution:
 a) no heat shrink on the T220 legs
 b) flux is like saturday night vomit out of the local bar

it's a legendary 7.5 DMM, you should work with gloves on it.
It's not a cow to milk out, you moron. I hate you.

Temped to put the T220 where the R&D decided to place it.

Why does my name always get dragged into a situation?  :o :-DD

hmm.... maybe it's your avatar? or that post you defaced with blue scrawls? :-DD
bark less, wag more.
 

Offline FransW

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42412 on: November 08, 2019, 03:27:11 pm »
Amazing what just turned up before the weekend.

Star-Tek, aliens and distorted sinuses
« Last Edit: November 08, 2019, 03:30:05 pm by FransW »
PE1CCN, Systems Engineering, HP, Philips, TEK, BRYMAN, Fluke, Keithley
 

Offline bsfeechannel

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42413 on: November 08, 2019, 03:29:08 pm »
And yes.....I would paint it blue.  :-DD

The satin bowerbird be like "Bitch, please!".

 

Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42414 on: November 08, 2019, 03:36:55 pm »
Potentially ROM replacement and re calibration needed  :o Lots of possible downside without checking the error numbers.

Potentially two work months to get it working again and $2000 more in parts/board to invest.
Oh no, it is drifting after 24h test... what I do now?
Finally after a lot of cussing it will work but the cal of that beast costs again Kdollars so you want to jump out the next window you find.

Absolutely. Once you get up into that kind of money there's no point buying a pig in a poke; it's penny-wise & pound foolish. If you're willing to go thousands of dollars, TEQ has them Refurb with warranty for "only" $2500 more pretty much every day.

mnem
 

Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42415 on: November 08, 2019, 04:31:37 pm »
Back to TEA, why the previous owner is always a moron?
(Attachment Link)

My PITA Points:

1) the two elco caps on the top are not deformed but smaller in diameter than what they should be.
2) the big ass blue (dedicated to med) elco cap is not stripped down with a zip tie to the board
3) the relocation of the T220 is nice for thermal but I do not like the execution:
a) no heat shrink on the T220 legs
 b) flux is like saturday night vomit out of the local bar

it's a legendary 7.5 DMM, you should work with gloves on it.
It's not a cow to milk out, you moron. I hate you.

Temped to put the T220 where the R&D decided to place it.

I don't see it being any improvement whatsoever; in fact, relocating there looks like it places U629 right next to an edge, with nut and screw protruding to hang up on everything. Thermal obviously is a non-issue here; the original location is a threaded boss swaged into the same exact piece of aluminum deckplate. The only arguable reason for relocating thusly is if threads in the boss were damaged and one was too lazy/cheap/ignorant to hunt up a tap & fix them. Given the barely tolerable execution of the "mod", I'd go with  lazy/cheap/ignorant; probably all in some measure.
  :palm:

Ummm... okay. There's none on the OEM deployment either. I often mount LM7Xxx with the legs nipped to approx 2mm long and no heat-shrink. I know you're not supposed to due to "thermal shock"; but if you solder quick it doesn't harm the reg (over 3 decades using this method and zero fails I can reasonably attribute to it) and makes a nice tidy install with easy maintenance. A real LM7Xxx from a reputable manufacturer is a wonder of abuse-tolerance; witness my recent adventure with one dumping approx 25V through a 10Ω resistor. :o

Damn Skippy. Unfuckerizing TE fucked by others is what we do for fun here. :-+

mnem
« Last Edit: November 08, 2019, 05:41:01 pm by mnementh »
 
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Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42416 on: November 08, 2019, 04:33:34 pm »

Hey @med I found another meter you could stack on your ugly duckling Fluke. Even painting it blue wouldn't help   :-DD eBay auction: #401819975598

stop  :palm: that do not have the digital data output option to use it with the funny little thermo printer
 

Offline Kosmic

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42417 on: November 08, 2019, 04:35:39 pm »
Temped to put the T220 where the R&D decided to place it.

I would do that yes  :)
 

Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42418 on: November 08, 2019, 05:01:21 pm »


 :popcorn:

 
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Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42419 on: November 08, 2019, 05:05:19 pm »
I will make adaptor sockets to give him better Opamps.
There are µA741 (in 14 pin DIP, that sucks! )
With some NE5534 or BB chips that it will be better..
« Last Edit: November 08, 2019, 05:20:45 pm by Martin.M »
 

Offline Zucca

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42420 on: November 08, 2019, 05:28:02 pm »
F§%& you moron!

Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 
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Offline Zucca

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42421 on: November 08, 2019, 05:30:18 pm »
I will make adaptor sockets to give him better Opamps.
There are µA741 (in 14 pin DIP, that sucks! )
With some NE5534 or BB chips that it will be better..

I need some of your love right now, please share.
Can't know what you don't love. St. Augustine
Can't love what you don't know. Zucca
 
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Online mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42422 on: November 08, 2019, 05:32:56 pm »
5000 Posts... Damn. Time for a Change.

Candidates are:         

Choose wisely; mnem has a strange sense of humor and may make you regret it. ;)

mnem
muahahaha!!!

« Last Edit: November 08, 2019, 05:35:59 pm by mnementh »
 

Offline Martin.M

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42423 on: November 08, 2019, 05:47:24 pm »

I need some of your love right now, please share.

it must not be allone in the cold ... dark ... working room, I found a little brother  :-+

 
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Offline Zucca

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #42424 on: November 08, 2019, 05:52:50 pm »
Nice Martin you should open a museum.

mnem DragonMohito-Avatar.png all the way... full steam ahead.
Can't know what you don't love. St. Augustine
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