Author Topic: Test Equipment Anonymous (TEA) group therapy thread  (Read 14547354 times)

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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88000 on: April 13, 2021, 01:15:48 pm »
My coockie or what it arranges to stay logged in... does not work.. i keep being logged out and when i log in again i am not in this treath again..
any advice on this guys?

I had the same problem .... what worked for me is do not go to page 3496 of this thread.  All the other pages (so far) seem to work except that one.
That was the current page right about the time of the data centre fire...

Great... first it was a wandering singularity that randomly consumes our pix, unmaking their entire existence... now eevBog has a haunted page on the TEA. What's next.... dragons and sword-weilding aardvarks...? Why not throw a Smurf or two in the mix for good measure...? smeeeeesh...
:palm:

mnem
*weirdening*
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Offline PA0PBZ

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88001 on: April 13, 2021, 01:22:55 pm »
Page 3496 works fine for me. The outage is on page 3498 which also works fine (for me).
Keyboard error: Press F1 to continue.
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88002 on: April 13, 2021, 01:25:06 pm »
So it's only haunted for "special" people...? Even better.  >:D

mnem

*currently haunting this coffee cup*
« Last Edit: April 13, 2021, 01:27:57 pm by mnementh »
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Online beanflying

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88003 on: April 13, 2021, 01:27:11 pm »
At the risk of sounding like Loogle or Microsnot try clearing your local cache  >:D Might be a corrupted image on the PC/device  :-//
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....
 

Offline tonyalbus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88004 on: April 13, 2021, 01:38:19 pm »
My coockie or what it arranges to stay logged in... does not work.. i keep being logged out and when i log in again i am not in this treath again..
any advice on this guys?

I had the same problem .... what worked for me is do not go to page 3496 of this thread.  All the other pages (so far) seem to work except that one.
That was the current page right about the time of the data centre fire...

Great... first it was a wandering singularity that randomly consumes our pix, unmaking their entire existence... now eevBog has a haunted page on the TEA. What's next.... dragons and sword-weilding aardvarks...? Why not throw a Smurf or two in the mix for good measure...? smeeeeesh...
:palm:

mnem
*weirdening*

 |O |O  The link to TEA that is sent to me by email ,when an update is there.. links to http://eev   .. not to https://eev  (there i have my exception for coockies on) ..
:))
Electronics enthusiast, TEA and Radio Amateur (PE1ONS)
Marconi  - TTi - Thandar - Thurmbly - HP - Fluke - Philips - Siglent - Owon - TEK - Anritsu - Keithley - AVO - BG7TBL
https://www.youtube.com/TonyAlbus
 
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Offline McBryce

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88005 on: April 13, 2021, 01:45:17 pm »
Well look what just arrived in the post. Two of these with mating connectors (although I didn't ask for them to be included). Has a thread been started yet?

I'll dump the two EPROMs first. The 27C1024 looks like it's just being used as a lookup table to convert BCD values to 7-Seg outputs. The smaller EPROM is routed to the rear connector?
The toggle switches are non-latching (spring back to the centre point). The top one is labelled "On" and "External On". The bottom one is labelled "Off" and "Set".

McBryce.

30 Years making cars more difficult to repair.
 
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Offline Specmaster

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88006 on: April 13, 2021, 02:01:23 pm »
So it's only haunted for "special" people...? Even better.  >:D

mnem

*currently haunting this coffee cup*
Yes it would seem so, as it also works fine for me as well.
Who let Murphy in?

Brymen-Fluke-HP-Thurlby-Thander-Tek-Extech-Black Star-GW-Avo-Kyoritsu-Amprobe-ITT-Robin-TTi
 
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88007 on: April 13, 2021, 02:07:33 pm »
Gah NHS WiFi blocks EEVblog  :palm:

 
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Online goaty

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88008 on: April 13, 2021, 02:12:56 pm »
I think I need to seek help soon.
Got a RTC1002 just two weeks ago,
now got a good deal on a RTB2004.
Aaargh.
 
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Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88009 on: April 13, 2021, 02:28:30 pm »
I think I need to seek help soon.
Got a RTC1002 just two weeks ago,
now got a good deal on a RTB2004.
Aaargh.

Those are very nice scopes.
Both of them.
 ;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 mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88010 on: April 13, 2021, 02:36:10 pm »
Only two...? Barely even a localized outbreak of TEA... you really need to try harder.  >:D

mnem
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88011 on: April 13, 2021, 02:54:42 pm »

You're not crazy. One bedroom apartment here and this is my living room.

You're both into green walls!  |O
Pink curtains too ?  :P

Kiss my arse...and ass too.  :P :-DD

Isn't that the dwagon's job?   ;D :-DD
Well I guess you could say that you've just been FIRED!!  >:D :o

Mmmmhmmm... grilled ass on my new BBQ. Yummm...    >:D

mnem
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88012 on: April 13, 2021, 02:55:02 pm »
Hi Ceberus,

during the last year I also played with different OCXO solutions for GPSDOs. I learned that it's better not to cover the OCXOs with foam because the heating-cooling-regulation needs the convection with free air.
It only makes sense to avoid direct air flow from a vent. All the professional solutions I have seen use the "naked" OCXO.

I have done this only one time since I had a OCXO without Vref output and I used a cheap TL431 for this. I put it at the can of the OCXO and covered it with foam.

I don't know why you'd think that. If the control loop for regulating the temperature of the OCXO was so badly designed that it needed some external cooling to be stable your point would be well made, and the control loop would not be. As it is I've never seen this and wouldn't expect to. If it needed a specific amount of convective cooling the data sheet would have to specify the amount of heat dissipation necessary and again, that is not something that I've ever seen. So I think you're a bit off with the expectation that "the heating-cooling-regulation needs the convection with free air".

In general most ovened things, be they XOs or voltage references benefit from having as much isolation from the local thermal environment as possible. Some ovened references go so far as to place the oven inside a dewar flask ('vacuum' flask). That you don't see it in many commercial designs is probably more likely down to being cheap than being about doing the job properly. Look at the old HP crystal ovens - dirty great things with loads of insulation inside the outer metal cans.

The OCXO from an HP 55300A GPSDO:
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88013 on: April 13, 2021, 02:58:23 pm »
Gah NHS WiFi blocks EEVblog  :palm:

Hotspot on your iPwn. No prob; eevBlog is pretty low BW. Given the current server pageload times, you probably won't even notice the difference... :-//

mnem
 :popcorn:

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Offline Wolfgang

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88014 on: April 13, 2021, 03:12:46 pm »
Hi Ceberus,

during the last year I also played with different OCXO solutions for GPSDOs. I learned that it's better not to cover the OCXOs with foam because the heating-cooling-regulation needs the convection with free air.
It only makes sense to avoid direct air flow from a vent. All the professional solutions I have seen use the "naked" OCXO.

I have done this only one time since I had a OCXO without Vref output and I used a cheap TL431 for this. I put it at the can of the OCXO and covered it with foam.

I don't know why you'd think that. If the control loop for regulating the temperature of the OCXO was so badly designed that it needed some external cooling to be stable your point would be well made, and the control loop would not be. As it is I've never seen this and wouldn't expect to. If it needed a specific amount of convective cooling the data sheet would have to specify the amount of heat dissipation necessary and again, that is not something that I've ever seen. So I think you're a bit off with the expectation that "the heating-cooling-regulation needs the convection with free air".

In general most ovened things, be they XOs or voltage references benefit from having as much isolation from the local thermal environment as possible. Some ovened references go so far as to place the oven inside a dewar flask ('vacuum' flask). That you don't see it in many commercial designs is probably more likely down to being cheap than being about doing the job properly. Look at the old HP crystal ovens - dirty great things with loads of insulation inside the outer metal cans.

The OCXO from an HP 55300A GPSDO:


Disagree. In fact its a consequence of control loop theory. A thermostat with NO loss and a finite heat capacity cannot be stabilized.
Its like a power supply with a huge capacitive and (almost) no resistive load. They go unstable as well, because the PSU can supply current, but (not SMUs) cannot drain any.

But for the HP10811A series, the minimum heat loss is less than a single W and it will work fine. I've seen double oven designs with a 10811A as a core, and no problem. I've built OCXOs in Dewars with above 10W of maximum heater power, but less than 200mW steady state power. Almost no overshoot, works fine.
 

Offline dl6lr

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88015 on: April 13, 2021, 03:21:07 pm »
Ordered at Welectron?

Nope, this is a tinyCurrent from n-Fuse.
 

Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88016 on: April 13, 2021, 03:22:05 pm »
Gah NHS WiFi blocks EEVblog  :palm:

Hotspot on your iPwn. No prob; eevBlog is pretty low BW. Given the current server pageload times, you probably won't even notice the difference... :-//

mnem
 :popcorn:

LMAO. Barely getting 3G. In the bowels of the building. Have nipped out for a snack and a fart  :-DD
 

Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88017 on: April 13, 2021, 03:30:40 pm »
You probably still wouldn't notice the difference.  :-DD

mnem
 :-/O
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Offline mnementh

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88018 on: April 13, 2021, 03:36:17 pm »


Hmmmm... enigmatic little brown box from Asia... I can't even read the city of origin...

mnem
honestly... I'm a bit afraid to open it...
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Offline bd139

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88019 on: April 13, 2021, 03:43:01 pm »
Crystal penises?
 
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Online BU508A

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88020 on: April 13, 2021, 04:09:23 pm »
Crystal penises?

May all your dreams come true.

 :-DD :-DD :-DD
“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 Cubdriver

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88021 on: April 13, 2021, 04:25:46 pm »
Posted on another forum I visit - moving the telephone BUILDING without interrupting service.  Holy shit!!

https://www.amusingplanet.com/2019/10/an-incredible-move-indiana-bell.html?m=1

-Pat
If it jams, force it.  If it breaks, you needed a new one anyway...
 
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88022 on: April 13, 2021, 04:25:59 pm »
Disagree. In fact its a consequence of control loop theory. A thermostat with NO loss and a finite heat capacity cannot be stabilized.
Its like a power supply with a huge capacitive and (almost) no resistive load. They go unstable as well, because the PSU can supply current, but (not SMUs) cannot drain any.

Yeah, but there's a huge difference between no loss (would require a perfect iso-thermal environment or infinite insulation), minimal loss (typical circumstances) and a required particular substantive loss (the case under consideration). The first is an impossibility, the second requires a typical and stable control loop, the control loop for the latter would become unstable if the required particular substantive loss was missing (by inference, because if the loss isn't required then the control loop would be unconditionally stable).

As it is, all oven controlled things are bounded by a specified operating temperature range, get too cold and you won't have enough heater power, get too hot and you just don't have cooling, or if you do (e.g. Peltier device) it is limited in capacity too.

You could most likely build a stable control loop in an absolute no loss situation as long as you could ensure no overshoot whatsoever which implies an infinite loop gain-bandwidth product which is as problematic as creating an absolute no loss situation. I'll pass on proving or disproving that speculation, my transfinite maths is non-existent - the very idea of both countable and uncountable infinities makes my head hurt.

Back to practical considerations, my OCXO in its little winter coat is still pulling 132mA @ 5V, so is still losing 655mW to the outside world (less whatever is being delivered as signal power - 5V 10MHz square wave into 5pF CMOS load).
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline Cerebus

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88023 on: April 13, 2021, 04:29:52 pm »
Posted on another forum I visit - moving the telephone BUILDING without interrupting service.  Holy shit!!

https://www.amusingplanet.com/2019/10/an-incredible-move-indiana-bell.html?m=1

-Pat

Goodness gracious me. It's amazing what you can do if you decide that it's gonna happen.
Anybody got a syringe I can use to squeeze the magic smoke back into this?
 
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Offline med6753

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Re: Test Equipment Anonymous (TEA) group therapy thread
« Reply #88024 on: April 13, 2021, 04:31:50 pm »
I'm back from the Specialist and without all the gory details I have to go back tomorrow for testing and on April 20th for more testing. I'm gonna feel like a fucking pincushion by the time their done. FML.

Stopped on the way home and bought some beer. Yep, Killian's Irish Red. Gonna get mildly shit faced this afternoon. Already had one and damn it tasted good.

UPS finally got their head out of their ass and delivered the Mouser order.   
An old gray beard with an attitude.
 
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