Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 18796071 times)

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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60325 on: June 06, 2020, 07:08:39 am »
An old gray beard with an attitude.
 
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Offline beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60326 on: June 06, 2020, 08:02:38 am »
More importantly the little Aussie Peso is BACK  >:D Now do I TEA or buy the last couple of big lumps of Laser bits? Peso goes up Bank Balance goes down  :palm:
Coffee, Food, R/C and electronics nerd in no particular order. Also CNC wannabe, 3D printer and Laser Cutter Junkie and just don't mention my TEA addiction....
 
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Offline jxjbsd

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60327 on: June 06, 2020, 08:36:58 am »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?
« Last Edit: June 06, 2020, 08:40:50 am by jxjbsd »
Analog instruments can tell us what they know, digital instruments can tell us what they guess.
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60328 on: June 06, 2020, 08:52:53 am »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

Nice.

What's the timebase? Is it on both channels? Both probes?

With a BNC cable, connect the cal out to a channel set to 50 ohms input. What does that look like?

N.B. the 485 has a decent 50ohm input. Most scopes have, at best, 50ohms//15pF. Also the cal out is a 1ns step.
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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Offline Wolfgang

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60329 on: June 06, 2020, 08:57:22 am »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

In electronics it does not matter so much if you hate physics or not. Whats really becomes a problem is when physics hates YOU. :) >:D
 
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60330 on: June 06, 2020, 09:13:21 am »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

In electronics it does not matter so much if you hate physics or not. Whats really becomes a problem is when physics hates YOU. :) >:D

You mean, there is some kind of on-off relationship going on between med and electronics?  8)  ;D  :-DD
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline jxjbsd

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60331 on: June 06, 2020, 09:13:32 am »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

Nice.

What's the timebase? Is it on both channels? Both probes?

With a BNC cable, connect the cal out to a channel set to 50 ohms input. What does that look like?

yes,   it is on both channels.  both probes
With a BNC cable, connect the cal out to a channel set to 50 ohms input.
You are right, so the connection waveform is completely normal.
You are quite familiar with waveforms :-+
« Last Edit: June 06, 2020, 09:53:19 am by jxjbsd »
Analog instruments can tell us what they know, digital instruments can tell us what they guess.
 

Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60332 on: June 06, 2020, 09:27:40 am »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

In electronics it does not matter so much if you hate physics or not. Whats really becomes a problem is when physics hates YOU. :) >:D

You mean, there is some kind of on-off relationship going on between med and electronics?  8)  ;D  :-DD

I couldn't help myself, but somehow Billy Paul crossed my mind:

Med and Mrs. Scope
They got a thing goin'on
They both know that it's wrong
But it's much too strong
To let it go now
They meet every day at the same workbench
Six-thirty and only TEA knows they'll be there
Soldering things, looking at all kinds of plans
While the TEA thread states some helpful comments

Med and Mrs. Scope
They got a thing goin'on
They both know that it's wrong
But it's much too strong
To let it go now
Med’s gotta be extra careful
That do he don't assemble caps the wrong way
Because she'll be not very amused
And so, and so, won't Med

Med and Mrs. Scope
They got a thing goin'on
They both know that it's wrong
But it's much too strong
To let it go now


Original by Billy Paul - Me and Mrs. Jones
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 
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Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60333 on: June 06, 2020, 09:40:28 am »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

In electronics it does not matter so much if you hate physics or not. Whats really becomes a problem is when physics hates YOU. :) >:D

You mean, there is some kind of on-off relationship going on between med and electronics?  8)  ;D  :-DD

on-off? No, I think he prefers analog to digital...   ;)
nuqDaq yuch Dapol?
Addiction count: Agilent-AVO-BlackStar-Brymen-Chauvin Arnoux-Fluke-GenRad-Hameg-HP-Keithley-IsoTech-Mastech-Megger-Metrix-Micronta-Racal-RFL-Siglent-Solartron-Tektronix-Thurlby-Time Electronics-TTi-UniT
 
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Offline Saskia

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60334 on: June 06, 2020, 10:25:23 am »
ok, had a so so day.
Finally my shipment of rare metals arrived.
60 grams of metal for around 3 effing grand. FFS.
Sold 2 of my motorbikes, now I only have the Milwaukee granny bobber left (the one that does not require me to lift my leg when getting onto it ...
Had a discussion with my boss why I needed a delegate. Fuck vacation, they call me even when I am in the middle of the pacific ...
I need to get a different phone number ...
Hf? Re? Np?

A couple of small disks of 241Am and Be. She already had the 3kg 239Pu  and a small phial of 3H. Apparently got a rodent problem, big rodents...

For those of us who haven't played with a chemistry set since we were 10 years old care to translate?  :-// I also hated chemistry in HS.

It's not chemistry, it's more about physics ...   :scared:

Example:


Actually it is quite dangerous to joke about these things in this country lest you get black clad visitors blowing up your front door.

So, nope, different metals. Nothing that can be used to wreak havoc with.
 

Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60335 on: June 06, 2020, 11:02:13 am »
That's pretty much the case in most countries, though I like to hope the relevant persons are discriminating enough to tell the difference between educated people with dark humour, and dangerous people with mental health issues.
nuqDaq yuch Dapol?
Addiction count: Agilent-AVO-BlackStar-Brymen-Chauvin Arnoux-Fluke-GenRad-Hameg-HP-Keithley-IsoTech-Mastech-Megger-Metrix-Micronta-Racal-RFL-Siglent-Solartron-Tektronix-Thurlby-Time Electronics-TTi-UniT
 

Offline nixiefreqq

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60336 on: June 06, 2020, 11:03:00 am »
"long eared galoot"

yer killin' me med!
free range primate
 

Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60337 on: June 06, 2020, 11:06:21 am »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

In electronics it does not matter so much if you hate physics or not. Whats really becomes a problem is when physics hates YOU. :) >:D

You mean, there is some kind of on-off relationship going on between med and electronics?  8)  ;D  :-DD

I couldn't help myself, but somehow Billy Paul crossed my mind:

Med and Mrs. Scope
They got a thing goin'on
They both know that it's wrong
But it's much too strong
To let it go now
They meet every day at the same workbench
Six-thirty and only TEA knows they'll be there
Soldering things, looking at all kinds of plans
While the TEA thread states some helpful comments

Med and Mrs. Scope
They got a thing goin'on
They both know that it's wrong
But it's much too strong
To let it go now
Med’s gotta be extra careful
That do he don't assemble caps the wrong way
Because she'll be not very amused
And so, and so, won't Med

Med and Mrs. Scope
They got a thing goin'on
They both know that it's wrong
But it's much too strong
To let it go now


Original by Billy Paul - Me and Mrs. Jones

Cute!  :-DD
An old gray beard with an attitude.
 
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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60338 on: June 06, 2020, 11:31:41 am »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

Nice.

What's the timebase? Is it on both channels? Both probes?

With a BNC cable, connect the cal out to a channel set to 50 ohms input. What does that look like?

yes,   it is on both channels.  both probes
With a BNC cable, connect the cal out to a channel set to 50 ohms input.
You are right, so the connection waveform is completely normal.
You are quite familiar with waveforms :-+

Good deal. Looks like that filthy 485 powered up after all.  :-+

Here's what the 1MHz cal waveform should look like into the 50 ohm input.



And I recommend re-capping the linear side of the PSU. That circuitry is located on the bottom board and it is modular and removes easily. There are several high value (47uf, 100uf) beaded tantalums that will give you trouble if not changed out.



And a word of experience.....do NOT ever attempt to remove the Vertical Board. Trust me on this.  |O
An old gray beard with an attitude.
 
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60339 on: June 06, 2020, 11:42:04 am »
FFS went to the tip/dump/recycling centre. 1.5 mi long queue!!! Fuck that. Going to drive round in circles stuffing public waste bins for an evening  :palm:
 
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Offline AVGresponding

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60340 on: June 06, 2020, 11:56:39 am »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

Nice.

What's the timebase? Is it on both channels? Both probes?

With a BNC cable, connect the cal out to a channel set to 50 ohms input. What does that look like?

yes,   it is on both channels.  both probes
With a BNC cable, connect the cal out to a channel set to 50 ohms input.
You are right, so the connection waveform is completely normal.
You are quite familiar with waveforms :-+

Good deal. Looks like that filthy 485 powered up after all.  :-+

Here's what the 1MHz cal waveform should look like into the 50 ohm input.



And I recommend re-capping the linear side of the PSU. That circuitry is located on the bottom board and it is modular and removes easily. There are several high value (47uf, 100uf) beaded tantalums that will give you trouble if not changed out.



And a word of experience.....do NOT ever attempt to remove the Vertical Board. Trust me on this.  |O

Those are some beautiful hand laid-out tracks!
nuqDaq yuch Dapol?
Addiction count: Agilent-AVO-BlackStar-Brymen-Chauvin Arnoux-Fluke-GenRad-Hameg-HP-Keithley-IsoTech-Mastech-Megger-Metrix-Micronta-Racal-RFL-Siglent-Solartron-Tektronix-Thurlby-Time Electronics-TTi-UniT
 
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Offline URI

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60341 on: June 06, 2020, 11:58:24 am »
In other news:
Got new HDDs for Backup and for renovating my router/file server that is still running debian Squeeze.   :palm:
No dist-upgrade possible anymore -will be a new installation.
Wonder how I will cope with that systemd magic since I'm used to the old shit SystemV-init...  :-/O
Yes I know, there is e.g. Devuan around. I will play around with both a little bit.
A life without TEA is possible but pointless.
 

Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60342 on: June 06, 2020, 12:34:30 pm »
FFS went to the tip/dump/recycling centre. 1.5 mi long queue!!! Fuck that. Going to drive round in circles stuffing public waste bins for an evening  :palm:

When I picked something up from RS at 9am 10 days ago, I asked someone at the front of the queue how long she had been there - since 7am. That fits with other reports in the paper for other nearby tips.
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
 
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Online tggzzz

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60343 on: June 06, 2020, 12:38:14 pm »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

Nice.

What's the timebase? Is it on both channels? Both probes?

With a BNC cable, connect the cal out to a channel set to 50 ohms input. What does that look like?

yes,   it is on both channels.  both probes
With a BNC cable, connect the cal out to a channel set to 50 ohms input.
You are right, so the connection waveform is completely normal.
You are quite familiar with waveforms :-+

This is my 485, 50ohm input, 1ns/div. Other examples here: https://entertaininghacks.wordpress.com/2016/09/17/scope-probe-accessory-higher-frequency-results/#more-823

« Last Edit: June 06, 2020, 12:39:45 pm by tggzzz »
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
 
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60344 on: June 06, 2020, 12:49:50 pm »
ok, had a so so day.
Finally my shipment of rare metals arrived.
60 grams of metal for around 3 effing grand. FFS.
Sold 2 of my motorbikes, now I only have the Milwaukee granny bobber left (the one that does not require me to lift my leg when getting onto it ...
Had a discussion with my boss why I needed a delegate. Fuck vacation, they call me even when I am in the middle of the pacific ...
I need to get a different phone number ...
Hf? Re? Np?

A couple of small disks of 241Am and Be. She already had the 3kg 239Pu  and a small phial of 3H. Apparently got a rodent problem, big rodents...

For those of us who haven't played with a chemistry set since we were 10 years old care to translate?  :-// I also hated chemistry in HS.

Not chemistry, physics. A DIY "physics package".

I never cease to be surprised at the number of electronics folks who seem to have an "other science" hole in their internal knowledge bases. At university all the types studying science or engineering seemed equally knowledgable and at least interested in the other science subjects (beyond their specialities) that they would have studied at secondary school. In my final residence at university we had a computer scientist, a chemist, a metallurgist, a biochemist, one oddball studying English and me. We could sit and have a conversation at supper on, say the metallurgist's final year project (stress corrosion cracking), and everybody apart from Kevin (English major) could join in and ask intelligent questions, even offer tentative solutions of the "why don't you..." variety. Even Kevin had obviously paid attention in science classes at school because he could still get the gist, if not the details.

My general assumption has always been that "sciencey types" are at least reasonably well informed on most basic science subjects, but that assumption fails more often than it succeeds when I'm dealing with "electronics types". I find that very odd.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60345 on: June 06, 2020, 12:57:04 pm »
True. However if you don't use it, you lose it. Engineering is a fairly abstract subject with a lot of kata rather than understanding. Regularly I find myself doing refreshers in A-level subjects so I don't look like an idiot to my kids. I did A-level higher mathematics, chemistry and physics and can remember precisely fuck all about any of them most of the time :)
 
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60346 on: June 06, 2020, 12:57:13 pm »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

He also obviously didn't pay attention in art classes either. Well, not unless his teacher was a big fan of Yves Klein and Paul Gauguin.  ;)
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60347 on: June 06, 2020, 01:06:39 pm »
I hated physics too.  ;D

This would explain a lot.  ;D  :-DD

He also obviously didn't pay attention in art classes either. Well, not unless his teacher was a big fan of Yves Klein and Paul Gauguin.  ;)

*hrr hrr*
That was a little bit mean.   ;D
“Chaos is found in greatest abundance wherever order is being sought. It always defeats order, because it is better organized.”            - Terry Pratchett -
 

Offline Wolfgang

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60348 on: June 06, 2020, 01:16:52 pm »
It does appear to be complete with no broken knobs that I can see but it certainly is filthy. Are you sure it hasn't been immersed in water? It sure looks like it.  :palm:
In fact, it never fell into the sea.  :-DD    It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

Nice.

What's the timebase? Is it on both channels? Both probes?

With a BNC cable, connect the cal out to a channel set to 50 ohms input. What does that look like?

yes,   it is on both channels.  both probes
With a BNC cable, connect the cal out to a channel set to 50 ohms input.
You are right, so the connection waveform is completely normal.
You are quite familiar with waveforms :-+

Good deal. Looks like that filthy 485 powered up after all.  :-+

Here's what the 1MHz cal waveform should look like into the 50 ohm input.



And I recommend re-capping the linear side of the PSU. That circuitry is located on the bottom board and it is modular and removes easily. There are several high value (47uf, 100uf) beaded tantalums that will give you trouble if not changed out.



And a word of experience.....do NOT ever attempt to remove the Vertical Board. Trust me on this.  |O

Repairing Tek 4 series scopes is a clear case of severe masochism. Tons of RIFAs, dried out electrolytics, overheated unobtainium ICs, ... and look at all the tants !!  >:D. These boxes were never made to last nor to repair :). Just stay away and waste your time on something funnier (except you are a hardcore masochist). :)
 
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Offline Ero-Shan

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #60349 on: June 06, 2020, 01:17:33 pm »
ok, had a so so day.
Finally my shipment of rare metals arrived.
60 grams of metal for around 3 effing grand. FFS.
Sold 2 of my motorbikes, now I only have the Milwaukee granny bobber left (the one that does not require me to lift my leg when getting onto it ...
Had a discussion with my boss why I needed a delegate. Fuck vacation, they call me even when I am in the middle of the pacific ...
I need to get a different phone number ...
Hf? Re? Np?

A couple of small disks of 241Am and Be. She already had the 3kg 239Pu  and a small phial of 3H. Apparently got a rodent problem, big rodents...

For those of us who haven't played with a chemistry set since we were 10 years old care to translate?  :-// I also hated chemistry in HS.

It's not chemistry, it's more about physics ...   :scared:

Example:


Actually it is quite dangerous to joke about these things in this country lest you get black clad visitors blowing up your front door.

So, nope, different metals. Nothing that can be used to wreak havoc with.

Okay, I have to add my to cents: 2 ounces of Au.
 


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