Author Topic: EEVblog #450 - Ebay Unboxing  (Read 16432 times)

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Online EEVblog

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EEVblog #450 - Ebay Unboxing
« on: April 05, 2013, 10:15:15 am »
Dave unboxes a random bit of gear from ebay. What is it?
Spoiler: http://bit.ly/11lzphL

 

Offline Cognito

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Re: EEVblog #450 - Ebay Unboxing
« Reply #1 on: April 05, 2013, 01:19:12 pm »
Interesting bit of gear :D

On the video it seemed like the CRT was lagging by 2-3 seconds before the phosphor lost its color.
Is it inherent for that type of CRT or is it just because it's old?

Also; would it be possible to do a entanglement experiment with this kind of gear?
If you think you got it, you're probably wrong
 

Offline nitro2k01

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Re: EEVblog #450 - Ebay Unboxing
« Reply #2 on: April 05, 2013, 01:33:49 pm »
I noticed that too. Maybe the display brightness is turned all the way up and that's why.
Whoa! How the hell did Dave know that Bob is my uncle? Amazing!
 

Offline Radio Tech

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Re: EEVblog #450 - Ebay Unboxing
« Reply #3 on: April 05, 2013, 01:57:40 pm »
Wow, very poor packaging. Don’t think I would have accepted it if I had to pay a premium priced for it. But for 50 bucks guess it is hard to complain. I bought a Sencore CS-61 scope off eBay that was packaged poorly.  Found the front bezel cracked and the trace was shaky once turned on. Cost me 200 bucks plus 50 for shipping. When I opened the case found a connected had fell off one of the bottom boards.  Plugged it up and the scope worked fine for 2 years. But now giving me a problem I have to research.

Can’t wait to see the tear down Dave.
Interested in what the inside looks like, especially the bent area.

Offline Fezder

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Re: EEVblog #450 - Ebay Unboxing
« Reply #4 on: April 05, 2013, 02:39:48 pm »
hey, nice unboxing video, terrifying example of how-not-to-pack-package  |O....

and, other notice, i remember when i was opening something, took little bit too long knife or pushed it too far, result: nice scratch on otherwise black metal case...
i saw victorinox's logo on your knife, good choise Dave, their steel is excellent, only that its pretty hard to sharp, but pays off in its durability.
i kind of disliked when you cutted cardboard with it, perhaps i'm just over-protecting my own knives, i use carbon steel one for cardboard, sorry, dont hate me for that note Dave :D. but, i'd love to see what's inside of that :).
Both analog/digital hobbyist, reparing stuff from time to time
 

Offline firewalker

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Re: EEVblog #450 - Ebay Unboxing
« Reply #5 on: April 05, 2013, 02:56:10 pm »
How much could you sell it?

Alexander.
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Offline HarryWeston

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Re: EEVblog #450 - Ebay Unboxing
« Reply #6 on: April 05, 2013, 03:49:01 pm »
Dave, one of the items that came up on the screen ,  at 8 mins 36 secs, as you pressed the buttons, was "Operating Hints" ....
« Last Edit: April 05, 2013, 03:57:13 pm by HarryWeston »
 

Offline Rufus

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Re: EEVblog #450 - Ebay Unboxing
« Reply #7 on: April 05, 2013, 03:56:54 pm »
Send the seller this example

 

Offline grumpydoc

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Re: EEVblog #450 - Ebay Unboxing
« Reply #8 on: April 05, 2013, 04:13:21 pm »
Ouch!  |O
 

Offline Fezder

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Re: EEVblog #450 - Ebay Unboxing
« Reply #9 on: April 05, 2013, 04:15:26 pm »
Send the seller this example



Hmm, i wonder did he keep he's job when/if boss saw that? :D
Both analog/digital hobbyist, reparing stuff from time to time
 

Offline Rufus

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Re: EEVblog #450 - Ebay Unboxing
« Reply #10 on: April 05, 2013, 04:26:27 pm »
Send the seller this example



Hmm, i wonder did he keep he's job when/if boss saw that? :D

His mistake would be getting videoed. I doubt the package handling within depots is much different. Fragile stickers and this way up arrows are worthless. You need inches of shock absorbing material around anything and more if it is fragile.

Assume anything you send could be dropped on a concrete floor from a height of 6 feet and you will probably be OK.
 

Offline Fezder

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Re: EEVblog #450 - Ebay Unboxing
« Reply #11 on: April 05, 2013, 04:29:22 pm »
Send the seller this example



Hmm, i wonder did he keep he's job when/if boss saw that? :D

His mistake would be getting videoed. I doubt the package handling within depots is much different. Fragile stickers and this way up arrows are worthless. You need inches of shock absorbing material around anything and more if it is fragile.

Assume anything you send could be dropped on a concrete floor from a height of 6 feet and you will probably be OK.

yeah, thats true allright :S...
Both analog/digital hobbyist, reparing stuff from time to time
 

Offline fthebest

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Re: EEVblog #450 - Ebay Unboxing
« Reply #12 on: April 05, 2013, 04:29:46 pm »
Nice instrument. I'm attending a master in particles physics and we have scalers in the laboratory but, as I can see, this one is more complicated and has data analysis capabilities.

A scaler is just a pulse counter, for counting photons or whatever particle you want a detector is needed. In this particular unit you can set a threshold value for the input signal, every time the input is above (or below some detectors generate negative outputs) the threshold the scaler count a pulse. In this one you can select a time bin and it gives you the number of counts in every bin, the trigger signal is a start signal for the acquisition and the timer used in the time bins.

IMHO you need a particle detector if you want to do something interesting, at least a photodiode.

Flavio
 

Offline grumpydoc

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Re: EEVblog #450 - Ebay Unboxing
« Reply #13 on: April 05, 2013, 04:31:46 pm »
Quote
Fragile stickers and this way up arrows are worthless. You need inches of shock absorbing material around anything and more if it is fragile.

Assume anything you send could be dropped on a concrete floor from a height of 6 feet and you will probably be OK.

Good advice.

 

Offline BiOzZ

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Re: EEVblog #450 - Ebay Unboxing
« Reply #14 on: April 05, 2013, 06:12:51 pm »
damn thats the biggest SD card slot i have seen yet!
where do i plug in my ipod?
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Offline SeanB

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Re: EEVblog #450 - Ebay Unboxing
« Reply #15 on: April 05, 2013, 06:41:19 pm »
I know that driver's cousin, he works for a courier company..............

I always try to pack a parcel so that you can play football with it, or drop it in a scrum  ( not American football, a proper Rugby scrum) and have it come out unscathed. Plenty of tape, plenty of packing and strong cardboard. I send lamps that way, and they so far have all arrived intact except for 1 that broke a filament in transit.
 

Offline BobC

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Re: EEVblog #450 - Ebay Unboxing
« Reply #16 on: April 05, 2013, 07:22:56 pm »
A Multi-Channel Scaler is fundamentally concerned with measuring pulses: When they arrive, how wide they are, how tall they are, how they are shaped, their total energy, and other parameters.  They are typically called "photon counters" because the pulses being analyzed are most commonly from sensors that detect photons, such as photomultiplier tubes or photodiodes.

The photons themselves often come from radiation sensors (scintillators mated with photomultiplier tubes), though when non-photonic radiation sensors are used (such as ion chambers), these instruments are then magically called "gamma counters".  Other popular photon sources include lidar and many types of fiber optic based sensors.

The general field of pulse analysis has many components with overlapping terms and many synonyms and redefinitions: Multi-Channel Analyzer, Pulse-Height Discriminator, Pulse Analyzer, Pulse Dwell Analyzer, and the list goes on and on and on.

Fundamentally, we care about several key pulse attributes:
  • Polarity (direction) of leading edge
  • Time of leading edge detection
  • Rate-of-Rise of leading edge
  • Pulse height (peak amplitude)
  • Time of peak height
  • Time of trailing edge detection
  • Rate-of-Rise (well, fall) of trailing edge
  • Pulse width
  • Pulse area (energy)

The first and most critical feature of an MCS is clearly to obtain and amplify pulses with extreme linearity and precise timing fidelity:  If you look at a narrow tall pulse, its frequency content can be staggering: MCS analog inputs must contain extremely good pulse amplifiers.

In any pulse sensor, it is common for more than one sources of pulses to be present.  For example, a radiation detector used in medicine (such as in a PET scanner) will also pick up pulses from cosmic rays and natural background radiation, not to mention the X-Ray machine in the next room.  So an important feature of an MCS is to "gate" the pulses based on any or all of the above pulse characteristics.

Once pulses of interest are identified, what is to be done with them?  We count them.  But since the pulses of interest will have characteristics that distinguish one from the next, we can choose characteristics of interest to create counting bins, or a histogram.  For example, most radiation sensors convert gamma strength to pulse height, so we create bins according to pulse height.  A lidar sensor cares more about pulse timing, so we would bin the pulses according to their delay following the initial laser illumination pulse.

An important characteristic of many pulse sources, especially radiation detectors, is that the pulse source is inherently random.  Pulses may overlap, and there will be arbitrarily long or short delays between pulses.  And every pulse detector has a characteristic of its own: It has a "recovery" or "dead" time after detecting a pulse before it is able to detect a subsequent pulse.  This is where the "multi-channel" aspect comes in: Multiple pulse detectors are used in parallel, timed to hopefully ensure that at least one is always out of its dead-time, with anti-coincidence logic present to ensure that pulse detectors triggered by the same pulse don't cause that pulse to be counted twice. 

Even with such precautions, every use of an MCS must be paired with a dead-time analysis, and an ensuing dead-time correction process (a statistical correction).  The best MCS units will monitor themselves and provide dead-time alarms (no free pulse detector) and an estimate of the pulses missed due to dead-time effects.  Many sensors also exhibit dead times, so the sensor itself must be carefully characterized, and its behavior statistically combined with that of the MCS to determine the overall dead-time penalty.

Some SR430 links:
http://www.physics.rutgers.edu/ugrad/389/muon/SR430m.pdf
http://www.thinksrs.com/products/SR430.htm

Enjoy!
 

Offline marshallh

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Re: EEVblog #450 - Ebay Unboxing
« Reply #17 on: April 05, 2013, 07:57:15 pm »
BobC thanks for your informative post  :-+
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Offline komet

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Re: EEVblog #450 - Ebay Unboxing
« Reply #18 on: April 05, 2013, 08:21:22 pm »
In the context of an electronics lab I think it would be useful to measure clock jitter. Apart from that, no idea.
 

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Re: EEVblog #450 - Ebay Unboxing
« Reply #19 on: April 05, 2013, 10:33:16 pm »
i kind of disliked when you cutted cardboard with it, perhaps i'm just over-protecting my own knives, i use carbon steel one for cardboard, sorry, dont hate me for that

I cut component pins with the scissors  >:D
 

Offline Smokey

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Re: EEVblog #450 - Ebay Unboxing
« Reply #20 on: April 05, 2013, 11:31:27 pm »
Of all the things to swipe when you leave a company, Dave swipes manuals for test equipment he doesn't have :)
Tell me you at least have a box full of pens and staplers too :)

Those old manuals do usually have full schematics which are a good source of circuit ideas. 
 

Online EEVblog

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Re: EEVblog #450 - Ebay Unboxing
« Reply #21 on: April 05, 2013, 11:53:11 pm »
Of all the things to swipe when you leave a company, Dave swipes manuals for test equipment he doesn't have :)

I bought a ton of stuff when Sercel shut down, but SWMBO found out how much it was all worth and made me sell it all  :'(
 

Offline ftransform

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Re: EEVblog #450 - Ebay Unboxing
« Reply #22 on: April 06, 2013, 04:47:21 am »
just in case the fundamental constants change LOL!

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Offline Fezder

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Re: EEVblog #450 - Ebay Unboxing
« Reply #23 on: April 06, 2013, 07:27:10 am »
i kind of disliked when you cutted cardboard with it, perhaps i'm just over-protecting my own knives, i use carbon steel one for cardboard, sorry, dont hate me for that

I cut component pins with the scissors  >:D

haha, well, its all about personal prefers :D
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Offline ninonpas

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Re: EEVblog #450 - Ebay Unboxing
« Reply #24 on: April 06, 2013, 10:41:59 pm »
hi dave !

you may want a get this from ebay for a next teardown : http://www.ebay.com/itm/NASA-ARTIFACT-VPI-Vehicle-Power-Interface-Rack-Console-Hubble-Space-Telescope-/261090432601

i’d buy it myself to convert it into a fancy coffe machine but i don’t have enough room in my kitchen!
 


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