Test Equipment Anonymous (TEA) group therapy thread

[med6753]

I hated physics too. 

This would explain a lot.   

 

[beanflying]

More importantly the little Aussie Peso is BACK  Now do I TEA or buy the last couple of big lumps of Laser bits? Peso goes up Bank Balance goes down 

[jxjbsd]

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. 

In fact, it never fell into the sea.      It's just some dust, which is being cleaned up.
Why is there a short slash in front of the waveform?

[tggzzz]

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. 

In fact, it never fell into the sea.      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.

[Wolfgang]

I hated physics too. 

This would explain a lot.   

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

[BU508A]

I hated physics too. 

This would explain a lot.   

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

You mean, there is some kind of on-off relationship going on between med and electronics?     

[jxjbsd]

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. 

In fact, it never fell into the sea.      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

[BU508A]

I hated physics too. 

This would explain a lot.   

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

You mean, there is some kind of on-off relationship going on between med and electronics?     

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

[AVGresponding]

I hated physics too. 

This would explain a lot.   

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

You mean, there is some kind of on-off relationship going on between med and electronics?     

on-off? No, I think he prefers analog to digital...   

[Saskia]

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 ...   

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.

[AVGresponding]

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.

[nixiefreqq]

"long eared galoot"

yer killin' me med!

[med6753]

I hated physics too. 

This would explain a lot.   

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

You mean, there is some kind of on-off relationship going on between med and electronics?     

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! 

[med6753]

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. 

In fact, it never fell into the sea.      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. 

[bd139]

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 

[AVGresponding]

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. 

In fact, it never fell into the sea.      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. 

Those are some beautiful hand laid-out tracks!

[URI]

In other news:
Got new HDDs for Backup and for renovating my router/file server that is still running debian Squeeze.   
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... 
Yes I know, there is e.g. Devuan around. I will play around with both a little bit.

[tggzzz]

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 

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.

[tggzzz]

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. 

In fact, it never fell into the sea.      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

[Cerebus]

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.

[bd139]

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

[Cerebus]

I hated physics too. 

This would explain a lot.   

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. 

[BU508A]

I hated physics too. 

This would explain a lot.   

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.   

[Wolfgang]

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. 

In fact, it never fell into the sea.      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. 

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 !!  . 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).

[Ero-Shan]

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 ...   

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.