
   Possible sources for Hg vapor calibration:
   1) The Penray lamp (a small tube ~ 2" long) with its special ballast is
   the
   standard Hg line calibration source.
   2) Ordinary CFL ("spring style" lamps) will give a few HG lines against
   a
   continuum of phosphorescence. I haven't tried it but it should probably
   be
   sufficient. Note the relative position of the lines and their
   wavelengths
   before moving the grating.
   3) T-5 , miniature 6" or 8" fluorescent lamps are available without an
   internal phosphor coating. These are used in germicidal fixtures and
   (with
   a filter) for geological prospecting.
   4) You might be able to find a "germicidal" lamp with a standard light
   bulb
   (Edison thread) base -- the clear glass envelope is a small sphere
   about 1
   1/2 " dia.
   5) Backyard pond water sterilizers use an Hg vapor lamp. I think these
   should not be operated for long out of cooling water.
   IMPORTANT NOTE: All HG lamps are capable of emitting potentially
   dangerous
   levels of ultra violet light. The Penray and germicidal lamps demand
   particular caution since they are designed to emit the 254nm Hg line
   and
   even 185nm line -- both wavelengths are in the UVC band. Shielding,
   using
   aluminum foil with a pinhole for calibration, and UV protection goggles
   are
   essential. Electric arc welding goggles MAY be appropriate (check
   first) ,
   gas welding goggles are NOT appropriate.
   Randall
   -----Original Message-----
   From: [1]Microscope@yahoogroups.com
   [mailto:[2]Microscope@yahoogroups.com]On
   Behalf Of J. Forster
   Sent: Monday, January 23, 2012 5:34 PM
   To: [3]nerd@verizon.net; Discussion of precise time and frequency
   measurement
   Cc: [4]microscope@yahoogroups.com
   Subject: [Microscope] Re: [time-nuts] HR2000 Retuning
   That about covers it. One note, this preoceedure will move the
   wavelength
   range the unit scans, but will not alter it. To cover a wider chunk of
   spectrum, the grating will have to be changed the one with fewer or
   more
   lp/mm.
   Also you can look for light leaks by shining a flashlight at the unit
   while watching the display,. A light leak will raise the noise floor
   across the spectrum.
   -John
   =================
   > My extreme curiosity eventually led me to acquire a couple ofHR2000
   > spectrometers from Roland. He still has several left, and if you ever
   > want to
   > have the chance to grab one of these, I recommend you act fast.
   >
   > The units he has were from a medical diagnostic device and have a
   grating
   > which
   > gives about 200 nm of range. The internal sensor is specified to
   operate
   > over
   > the range of 200 to 1100 nm. My units were adjusted to work over the
   > range of
   > about 467 to 671 nm. Should you need it, Ocean Optics will gladly
   (for
   > IIRC
   > around $500) put a different grating in, or for somewhat less, change
   the
   > range
   > of the existing grating.
   >
   > I needed to be able to cover the wavelength of a Blu-ray laser at
   around
   > 405 nm
   > so decided to attempt a recalibration. I was able to download the
   manual
   > as
   > well as their OOIBase32 software which talks to the spectrometer over
   USB.
   > I
   > got a couple of USB adapters so I could plug the units directly into
   the
   > computer's standard ports.
   >
   > On the side of the unit you will notice a circular slotted pattern
   with a
   > center
   > screw slot and two screws 180 degrees apart on the circle. Those
   outer
   > screws
   > have lockwashers and each had a dab of glue. From the manual it was
   clear
   > that
   > this is the holder of the grating. I loosened the outer screws, and
   while
   > the
   > spectrometer's input fiber was pointed at the 405 nm laser spot, I
   slowly
   > turned
   > the center slot with a screwdriver. It didn't take much turning (CCW)
   > before I
   > saw a strong response peak. I moved it to sufficiently within the
   range
   > and
   > tightened the two outer screws.
   >
   > Now I turned to Appendix A in the HR2000 manual. I had to locate a Hg
   > lamp (I
   > was able to find an antique scientific unit on feebay) as you will
   need
   > several
   > strong spectral lines within your range for the cal procedure. I
   actually
   > cheated slightly from the procedure, I made an educated guesstimate
   of the
   > short
   > wavelength being seen and loaded that into the unit with the
   USBprogrammer
   > utility. That made it a little easier for me to identify the Hg
   lines.
   >
   > Read the procedure all the way through and understand it before
   trying it.
   > Less
   > hair pulled out that way. I followed the instructions, did the linear
   > regression as they specified in Excel (yes, an old version will work
   just
   > fine),
   > and loaded the correction factors into the unit's EEPROM (again,
   using
   > USBprogrammer).
   >
   > I then plugged both my units in at the same time, and if you get
   > SprectaSuite
   > from Roland (he usually sends it on a CD) and you have multiple
   units, you
   > will
   > see both of their responses superimposed. I pointed both fibers at
   the HG
   > lamp
   > (no, I didn't look into an unfiltered lamp!) and where the units
   ranges
   > overlapped, the spectral lines coincided precisely. I could have
   gotten a
   > larger range, but for now I have two units with a combined range of
   about
   > 370 to
   > 670 nm. I'm just not sure which end I want to expand another 100 nm.
   >
   > The procedure overall is not that difficult, and I got it right on
   the
   > first
   > try, but you MUST have a source of a multitude of spectral lines! The
   > good part
   > is that you don't have to open the unit up, so no chance of getting
   any
   > dust
   > inside.
   >
   > One note: theu nits have a mulitpin connector on one of the edges. I
   > found
   > that ambient light was getting in and raising the overall "dark"
   floor.
   > The
   > cure was simply to place a piece of black vinyl electrician's tape
   over
   > the
   > connector, flush with the case.
   >
   > Any questions, feel free to contact me off-list.
   >
   > Peter
   >
   > P.S., John, please forward to the microscopes group. I joined the
   > Tekscopes
   > group and ended up with a mountain of scopes, and the time-nuts group
   and
   > now
   > have a pile of time measurement and standards stuff, so no way I'm
   joining
   > the
   > microscopes group. I have just one, and it's crappy but works, and
   I'll
   > just
   > stop right there while I can still afford rent.
   >
   >
   >
   > On 1/23/2012 10:32 AM, J. Forster wrote:
   >> I've been bombarded with emails about retuning the spectrometers.
   I'll
   >> get
   >> the info and repost it in the near future, unless Peter would prefer
   to
   >> put it up himself.
   >>
   >> Best,
   >>
   >> -John
   >>
   >> ==============
   >>
   >>
   >> _______________________________________________
   >> time-nuts mailing list -- [5]time-nuts@febo.com
   >> To unsubscribe, go to
   >> [6]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
   >> and follow the instructions there.
   >>
   >>
   >> -----
   >> No virus found in this message.
   >> Checked by AVG - www.avg.com
   >> Version: 10.0.1416 / Virus Database: 2109/4760 - Release Date:
   01/22/12
   >>
   >>
   >
   > _______________________________________________
   > time-nuts mailing list -- [7]time-nuts@febo.com
   > To unsubscribe, go to
   > [8]https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
   > and follow the instructions there.
   >
   >
   ------------------------------------
   Yahoo! Groups Links
   __._,_.___
   [9]Reply to sender | [10]Reply to group | [11]Reply via web post |
   [12]Start a New Topic
   [13]Messages in this topic (2)
   Recent Activity:
     * [14]New Members 11
     * [15]New Photos 10

   [16]Visit Your Group
   [17]Yahoo! Groups
   Switch to: [18]Text-Only, [19]Daily Digest o [20]Unsubscribe o
   [21]Terms of Use
   .

   [nc3=4507179]

   __,_._,___

References

   1. mailto:Microscope%40yahoogroups.com
   2. mailto:Microscope%40yahoogroups.com
   3. mailto:nerd%40verizon.net
   4. mailto:microscope%40yahoogroups.com
   5. mailto:time-nuts%40febo.com
   6. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
   7. mailto:time-nuts%40febo.com
   8. https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
   9. mailto:rbuck@silcom.com?subject=RE%3A%20%5BMicroscope%5D%20Re%3A%20%5Btime-nuts%5D%20HR2000%20Retuning
  10. mailto:Microscope@yahoogroups.com?subject=RE%3A%20%5BMicroscope%5D%20Re%3A%20%5Btime-nuts%5D%20HR2000%20Retuning
  11. http://groups.yahoo.com/group/Microscope/post;_ylc=X3oDMTJwYm80OTBxBF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEbXNnSWQDNjYyMzMEc2VjA2Z0cgRzbGsDcnBseQRzdGltZQMxMzI3NDIyOTU4?act=reply&messageNum=66233
  12. http://groups.yahoo.com/group/Microscope/post;_ylc=X3oDMTJkaDkzbG9jBF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEc2VjA2Z0cgRzbGsDbnRwYwRzdGltZQMxMzI3NDIyOTU4
  13. http://groups.yahoo.com/group/Microscope/message/66226;_ylc=X3oDMTM1NmV1a3VuBF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEbXNnSWQDNjYyMzMEc2VjA2Z0cgRzbGsDdnRwYwRzdGltZQMxMzI3NDIyOTU4BHRwY0lkAzY2MjI2
  14. http://groups.yahoo.com/group/Microscope/members;_ylc=X3oDMTJlczF0cGdrBF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEc2VjA3Z0bARzbGsDdm1icnMEc3RpbWUDMTMyNzQyMjk1OA--?o=6
  15. http://groups.yahoo.com/group/Microscope/spnew;_ylc=X3oDMTJlYTFtcWU3BF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEc2VjA3Z0bARzbGsDdnBob3QEc3RpbWUDMTMyNzQyMjk1OA--
  16. http://groups.yahoo.com/group/Microscope;_ylc=X3oDMTJkc2Y2bGVxBF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEc2VjA3Z0bARzbGsDdmdocARzdGltZQMxMzI3NDIyOTU4
  17. http://groups.yahoo.com/;_ylc=X3oDMTJjY2x1bGRtBF9TAzk3MzU5NzE0BGdycElkAzEyNzg0MgRncnBzcElkAzE3MDUwODI5NDYEc2VjA2Z0cgRzbGsDZ2ZwBHN0aW1lAzEzMjc0MjI5NTg-
  18. mailto:Microscope-traditional@yahoogroups.com?subject=Change%20Delivery%20Format:%20Traditional
  19. mailto:Microscope-digest@yahoogroups.com?subject=Email%20Delivery:%20Digest
  20. mailto:Microscope-unsubscribe@yahoogroups.com?subject=Unsubscribe
  21. http://docs.yahoo.com/info/terms/
