DL122 - Hitachi S800 Scanning Electron Microscope Teardown Part 1
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- เผยแพร่เมื่อ 22 ก.ย. 2024
- In this video i quickly walk around a Hitachi S800 Electron Microscope from 1988 and begin disassembly ready for a detailed teardown.
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I love your dot-matrix intro... So many people are "stealing" all the ideas I had for doing a technical TH-cam channel but am far too lazy to start (let alone finish). :)
I was thinking "Oh no! He shouldn't tear that down... it's too cool... he should get it working"... but then you explained what parts were missing and I was like "Oh well... tear it down as much as you like, mate!".
Yes that sem was a bit of a basket case, but many of the parts went out to help other people including someone trying to restore one so i am glad i saved it from just being scrap metal.
10:00 There is access to the ion pump from the chamber
so they can be roughed out, before turning them on.
You cannot start an ion-pump from air. You usually
pull them down to 10-5 Torr with a rotary, then diff or turbo,
valve off, then kick them on.
Thanks James
a rotary alone can't achieve a vacuum lower than 10-3 torr.....
Awesome teardown. Thanks.
Thanks!
Hi ! Very nice video ! A few details regarding the video - the "X ray" detector is actually a secondary electron detector -it contains an aluminum coated scintillator, a light pipe (perspex/plexiglas) and a photomultliplier (most likely a Hamamatsu 268 - a SEM workhorse). The other - retractable - detector seems to be a backscatter electron detector or indeed an x-ray detector. Note that both aperture holders contain "boxes" with opamp which are used to compensate momentary fluctuation in electron flux
Chooching the electron pixies around
Some info on this microscope, since i have one. The microscope did not have its roughing pumps in the console. It used 2 external ones controlled by plugs on the column.
That loose pipe you mentioned, is most likely the LN2 output pipe for the LN2 cold baffle. (not 100% sure its actually LN2, its too soon to tell yet, but everything points to that cold baffle being LN2 filled.
Ill know more once i start the restoration. (i fully intend to document it on video)
edit:
Oh, and that separate port for the ion pumps, is the bypass valve needed to pump down the column to start the ion pumps.
Once the pumps start, this is closed, using the manual valves. Also the ion pumps run 24/7. Pumping the column down takes about a day or so. (at the very least, i will see how long it takes for my own machine, once i get the point where i can pump it down)
edit 2:
that thing you referred to as the x-ray detector is marked as the secondary electron detector in the manual. And the thing you referred to as the secondary electron detector, might actually be a x-ray spectrometer. Im guessing that, since it has an angled window, and is movable. Seeing as soft x-rays are conducted like regular light, it would make scene. I can also say, that my machine appears to only have the secondary electron detector installed. Though i might just be missing the xray spectrometer on my visual inspections, as well as reading the manual (it makes mentions of how to use it, but not where it is on the machine)
Also that detector on the aperture, is another beam monitor. This machine has 2.
Yes i think your right about the LN2, when i removed that Anelva part during disassembly everything about it looked like it was for something cold and liquid, i think the pipe was an overflow into the polystyrene container. There was some wires entering it too with some sensors set at different levels running to a controller, so i think that controlled the level within that cold baffle. There is another baffle underneath which is fed with the same supply as the coolant for the diffusion pump.
you wouldn't happen to have pictures of those wires coming from the cold baffle? I want to check if my unit has them as well. I was recently wondering how i would know the fill level of it, and that would explain that. However i find no mention of it in the manual (at least so far). Though the original operator might be able to tell me more.
The worst case scenario for this microscope is an oil back stream, hence the LN2 baffle. And since i will need to pump down the column from what is probably atmospheric pressure, i will need to use the bypass manifold to evacuate the column. Doing so is risky as i don't want diffusion pump oil anywhere near my electron gun. Yet i don't want to waste LN2 either...
If your interested in this project of mine, i can notify you when i make the first video about it. This might be soon ish, though it might also take a while. Depending on a few factors.
Also, out of curiosity, how much of the microscope do you still have? I may be in need of some parts eventually.
edit: you would not happen to have images of what you called the secondary electron detector? where the connectors are visible. (and readable)
I have an update, i am now in contact with someone experienced with the S800 (maintenance and the such), and based on what he said, you mixed up the detectors, the Secondary electron detector is the thing with the black cylinder on the back, which is non movable. The movable thing, is the X-Ray Detector.
Thanks for all the additional info, the S800 is pretty much down to it's shell now with all the major components disassembled. I have a large box of items that i have saved and parts people have put their names on. I'll be making a final video shortly on it all. I have saved the LN2 level monitor for the baffle so i will make a point of showing it in the video for you.
wooohooooo !!!
that's awesome. what a great video! can't wait to see part 2.
don't dump the frame. it could do well as a hifi turntable basis.
Thanks Max, i am really interested to see inside the column i removed, i think it contains beautiful things!
Wow! I want one too :(
SEM's are the best toy can get for x-mas :)
Haha, this aged well :>
4:10 someones been watching ave:)
yep, doesn't everyone?
Is the EEVBlog forum the only place to ask for parts? Because those gang switches from the front would make an amazing source selector for my stereo system...
That's a lot of CRT monitors and tables feet and random junk you have in storage in the background !
Indeed I spy at least 2 PVM/BVMs!
There is one BVM, but it's an Ikegami and not trinitron, anything else is either a low spec 9" PVM or a CCTV monitor
blame Carl for the random junk! :-)
[+]
Just ran an old DVD player into the PVM and hit it with some older DVDs. Looked amazing!
also, a big shoutout to Carl, for all the help, and providing space....
:-)
Any chance the LN2 baffle is still available? I have a fully functional JEOL JSM 35 that I want to start doing some bio work with, and that cold finger would be very useful.
看起来还挺结实的，有扫描线圈的细节嘛
12:45 Is it just me? That knob has a smiley printed on!
LOL!
:)
7:12 For anyone who just wants to get to the good stuff.
chooche factor :D good ol' AVE
To fill in some of the holes, Sam Zeloof has one of these (or a very similar model) in more or less full working order: th-cam.com/video/RJXio_jpc_Y/w-d-xo.html
Hi, interesting video! I own a Cambridge Stereoscan 260 together with some friends. It needs some TLC and I will try to document the process of getting it working again. The electronics is old and a bit unusual. You can find a thread about it here (in Swedish)
elektronikforumet.com/forum/viewtopic.php?f=9&t=84449
Looking forward to seeing your teardown of the column :) Some nice wounded coils in there.
I hope you get yours working, best of luck! The column should be coming apart next week.
It really hurts my eyes to see such a jewel of technique being roughly rampaged for just feeding a video to youtube instead of getting it back to work as its condition seemed to be really good and this machine could have still offered a lot of nice and valuable imaging....
There was little chance to make it run again IMO, the entire control and imaging console was missing which also housed some of the vacuum system, there was no sample table. Parts of it did however go to help someone restore an identical machine that was in much better condition at a university so don't feel too bad about it.
OMG! for your channel there must be more subs!!!! wtf are people doing these days?!
Pewdiepie is GARBAGE in comparison to these....
Thank you!
Just get to the point !
hans gruber
You know you can scroll through the video right?