Re: presentation and JEOL SEM problems
- From: ordell <ordell@xxxxxxxxxxx>
- Date: Sat, 13 Dec 2008 01:50:44 -0800 (PST)
On Dec 13, 5:30 am, Frogwatch <dboh...@xxxxxxxxxxxxxx> wrote:
On Nov 24, 1:53 pm, ordell <ord...@xxxxxxxxxxx> wrote:
Hello,
I'm a new member of this group. I work as a Science teacher (Junior
high) in Sweden. We've three JEOL SEM, however only two working at the
moment. Being on a limited budget, essentially zero, I'm trying to
keep the microscopes alive. The SEMs' are: a JEOL T200, T330 (not
working) and a 35C.
Problems
T200: vibrations and image quality. The built in rotary pump transfers
vibrations through the vacuum hose and the floor (remember it's a
school) to the microscope.
J35C: Today I changed the old objective apertures to a new one and
haven't been able to adjust the aperture back to the beam location. I
follow the instruction for beam alignment but with no result.
Thankful for any suggestions
Erik
On the T200, do you have a vibration isolation weight? This is simply
a concrete filled container where the hose from the roughing pump goes
into it and another hose comes out going to the SEM. You can make one
with a paint bucket, concrete and PVC pipe.
For the 35, check to see if the aperture strip has become loose and
sagged. You may have to work with it to make sure it is tight.
Another possibility is that when you reinstalled it you did not
actually get it into the right place. I Once put it in and instead of
going into the hole in the side of the lens it went BELOW the lens.
Have fun
David
Hi David,
thanks for the advice. I'm rather lonely at my school having some
knowledge in electron microscopy. Being a physicist I enjoy making
these very high quality instruments working well. However, there is no
one to discuss all the small and big issues. I'm also the one
responsible for obtaining the scopes, so they better work.
I've also managed to put the strip below the lens a couple of times,
and the aperture strip got a bit sagged. The holder is also supposed
to isolate the strip and one of the isolating XXX (small rings with a
hole. Forgot the English word) is missing. I guess it is made of some
mica material. I replaced it with something less perfect to keep the
electric insulation intact. I've ordered a spare but don't expect
delivery before Christmas. I'll return the old aperture strip in order
to get a working system and pinpoint the source of error.
Sometimes it pays to work at a poor school. I found artefacts of
SemAfore digitizer equipment in both our microscopes. [The SemAfore
(and I guess there are many brands doing this) improves the image on
these old SEMs']. I contacted the JEOL agent in Scandinavia and asked
if these systems could be restored (the digitizer board and software
were missing in both cases). The salesman said he actually had some
old digitizer cards with ISA connector (meaning Pentium III or older
and Windows 98) on some shelf. An upgrade to a new system was also
possible for $2500. A new system is in Sweden $6000. Not bad, but not
easy for a school. He suddenly said:"You work at a school, right? I'll
send you two digitizer cards, hardware lock, software and manual for
free." He must have sold a multimillion dollar microscope that day or
something. I've got one system close to working. I still need to
adjust the number of scan lines and pixelsize. The other, older one,
don't recognise the serial number of the digitizing card so I don't
know if it will work or not.
Erik
.
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