[Polhe3] wavemeter info more

[Zhiwen Zhao]

Here is a cheaper model with less resolution.
but I think it's enough for density measument

And the optical coupler seems convenient to use too.

Zhiwen

-------- Forwarded Message --------
Subject: RE: Unit is ready
Date: Wed, 11 Nov 2015 16:42:46 -0500
From: Walter Hersom <whersom at bristol-inst.com>
To: 'Zhiwen Zhao' <zwzhao at jlab.org>
CC: 'Xiaqing Li' <xl79 at phy.duke.edu>

Hi Zhiwen,

Bristol's LC-1 Series Fiber-Optic Input Coupler is a convenient way to
couple a collimated laser beam into a 9 micron core fiber for use with your
WA-1000.  I have attached the brochure for your review.

Pricing:
LC-1-VIS (400 - 1100 nm): $450
LC-1-NIR (520 - 1700 nm): $450
LC-1-UV: (350 - 1100 nm): $650

If you laser's bandwidth is < 40 GHz, but > 10 GHz the wavelength accuracy
of the 621B is reduced to approximately +/- 10 parts per million.

The price for 621B-NIR (520-1700 nm) is $17,500 (same price for the VIS
version).  However, if an accuracy of +/- 10 parts per million is enough
then Bristol's 521 Laser Wavelength Meter might be an option to consider.

The 521 Series measures the wavelength of CW lasers to an accuracy of ± 10
parts per million (±0.01 nm @ 1000 nm), which is guaranteed through
continuous calibration with an internal wavelength reference. The 521 Series
is available in two wavelength range versions; VIS (400-1100nm), and NIR
(520-1700nm). The price for either version is $8,000.

I have attached the brochure for the 521 Series as well.  I will give you
call tomorrow.

Regards,
Walter

-----Original Message-----
From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
Sent: Wednesday, November 11, 2015 12:22 PM
To: Walter Hersom <whersom at bristol-inst.com>
Cc: 'Xiaqing Li' <xl79 at phy.duke.edu>; 'John Theodorsen'
<jtheodorsen at bristol-inst.com>
Subject: Re: Unit is ready

Dear Walter

Thanks a lot for the info.
The new model is certainly interesting.
For our laser with bandwidth < 40GHz, is the 612A with max bandwidth 1HGz
kind of low.
Would the 612B with max bandwidth 10GHz a better choice and how much is it?
Or you have some other model at level of 40GHz?

I am passing this info to jlab group to see if they are interested.

By the way, what beam to fiber coupler can I get with my WA1000.
I am thinking about buying one.

Zhiwen

On 11/11/2015 11:47 AM, Walter Hersom wrote:
> Hi Zhiwen,
>
> Happy to see you and John were able to get your WA-1500 working.
>
> I’m not sure if you are aware, or if there would be interest in
> Bristol’s upgrade program.  However I would be remiss if I did not let
> you know about it, since the program expires December 31, 2015.
>
> Last May, Bristol Instruments announced a special upgrade program
> intended to help researchers who may need to replace their old
> Burleigh Wavemeter. By trading in a Burleigh Wavemeter, a discount as
> high as 15% would be applied to the purchase of any of the Laser
> Wavelength Meters provided by Bristol Instruments.
>
> Bristol’s 621A Laser Wavelength Meter is the perfect replacement for
> the model WA-1500.  The 621A system has the same absolute wavelength
> accuracy of ± 0.2 parts per million but with a much better
> repeatability as high as ±
> 0.03 parts per million.  If you are interested in replacing your
> WA-1500 Wavemeter, now is the perfect time.  Bristol is offering a 15%
> trade-in discount toward the purchase of any 621A through the end of
> 2015.  This would be a savings of about $4,000.
>
> I have attached brochures for the 621 Series for your review.  I will
> give you a in a few days to discuss this further.  Meanwhile, please
> to not hesitate to call me at (585)924-2620, or email me at
> whersom at bristol-inst.com.
>
> Regards,
> Walter
> ______________________
> Walter R. Hersom
> Bristol Instruments, Inc.
> 50 Victor Heights Parkway
> Victor, NY 14564
>
> (585)924-2620 ext. 116
> whersom at bristol-inst.com
> www.bristol-inst.com
>
> -----Original Message-----
> From: John Theodorsen [mailto:jtheodorsen at bristol-inst.com]
> Sent: Wednesday, November 11, 2015 9:57 AM
> To: 'Zhiwen Zhao' <zwzhao at jlab.org>
> Cc: 'Walter Hersom' <whersom at bristol-inst.com>;
> salgera at bristol-inst.com; 'Xiaqing Li' <xl79 at phy.duke.edu>
> Subject: RE: Unit is ready
>
> Hi Zhiwen,
>
> My pleasure!  I'm glad we stuck with it.  Best of luck in your
> experimentation.
>
> Best regards,
>
> John
>
> -----Original Message-----
> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
> Sent: Wednesday, November 11, 2015 9:51 AM
> To: John Theodorsen <jtheodorsen at bristol-inst.com>
> Cc: 'Walter Hersom' <whersom at bristol-inst.com>;
> salgera at bristol-inst.com; 'Xiaqing Li' <xl79 at phy.duke.edu>
> Subject: Re: Unit is ready
>
> hi, John
>
> I only replaced the broken belt without touching anything else.
> So hopefully it's ok.
> If I get other chance to verify it later, I will let you know.
>
> Thanks a lot for everything!
>
> Zhiwen
>
> On 11/11/2015 8:16 AM, John Theodorsen wrote:
>> Hi Zhiwen,
>>
>> OK, so it looks like you are getting the expected 795nm reading -
>> good!  I'm pleased we could solve this without a return trip.
>>
>> The purpose of the belt is only as a linkage.  The motor speed is the
>> same as it was, therefore you can expect accurate readings.
>>
>> If you want to be "110%" sure, you need something of known
>> wavelength, like a HeNe, to verify.  However, I think this is
>> unnecessary as long as you have not made any alignment adjustments to the
interferometer.
>> If you have, then that is a different situation.
>>
>> Best regards,
>>
>> John
>>
>> -----Original Message-----
>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>> Sent: Tuesday, November 10, 2015 6:20 PM
>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>> Cc: 'Walter Hersom' <whersom at bristol-inst.com>;
>> salgera at bristol-inst.com; 'Xiaqing Li' <xl79 at phy.duke.edu>
>> Subject: Re: Unit is ready
>>
>> Hi, John
>>
>> We got the laser working.
>> The photos are the signal on pin 1 and the wavemeter panel.
>> I can't reading see modulation and the reading seems stable.
>>
>> The remaining question would be how I know the reading wavelength is
>> correct without further need of calibration?
>> In another word, after you calibrated it, belt broke, then I added a
>> new belt, How do I know it doesn't need calibration again.
>>
>> Thanks a lot
>>
>> Zhiwen
>>
>> On 11/6/2015 5:04 PM, John Theodorsen wrote:
>>> Dear Zhiwen,
>>>
>>> OK; good luck and let me know how it goes!
>>>
>>> Best regards,
>>>
>>> John
>>>
>>> -----Original Message-----
>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>> Sent: Friday, November 06, 2015 5:02 PM
>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>> Cc: 'Walter Hersom' <whersom at bristol-inst.com>;
>>> salgera at bristol-inst.com; 'Xiaqing Li' <xl79 at phy.duke.edu>
>>> Subject: Re: Unit is ready
>>>
>>> Dear John
>>>
>>> Thanks a lot for the info.
>>> We couldn't run our Spectra-Physics laser for a while due to safety,
>>> but should able to do it soon.
>>> I will give it a try and let you know.
>>>
>>> Zhiwen
>>>
>>> On 11/6/2015 4:38 PM, John Theodorsen wrote:
>>>> Dear Zhiwen,
>>>>
>>>> I cannot 100% conclude anything from the data you have provided, I
>>>> can only speculate.  But I need you to help me eliminate variables
>>>> (like a hand-held input source!) otherwise my guesses from here
>>>> will not be as
>>> effective.
>>>>
>>>> The envelope of the 'input' fringe pattern you sent to me, with its
>>>> up-down pattern, may well be causing these readings.  I cannot
>>>> conclude
>>> for sure,
>>>> but it is a strong possibility.   That up-down, I am guessing, may be
> due
>>> to
>>>> power supply issues due to its time scale.
>>>>
>>>> Your hand-alignment does not have to do with the 20 microsecond
>>>> modulation,
>>>> however: the wavemeters depend on a stable-pointing input source.
>>>> Providing that as a first condition is very important in a
>>>> troubleshooting environment.  Can you send a photo of what is
>>>> happening at
>>> the input?
>>>>
>>>> Don't worry about error 13 right when you turn it on.  If it goes
>>>> away within say 10 seconds, you're fine and can ignore it.  If it
>>>> remains, then that may be a problem, but it would definitely not
>>>> have to do with the wavemeter reporting a wildly inaccurate
>>>> reading, as you're saying.  The oscilloscope trace you sent shows
>>>> 4.5Volts or so, which is plenty of amplitude and would not result
>>>> in error 13, unless something else systematic is a problem inside the
wavemeter.
>>>> If this is so, the odds go down that we can repair it.
>>>>
>>>> If you can try it with your Spectra-Physics laser, that would be
>>>> good for comparison of the input fringe envelope.  If the 20
>>>> microsecond period remains, it's a Burleigh problem.  If not, then
>>>> it's more likely coming from your 795nm laser.
>>>>
>>>> Best regards,
>>>>
>>>> John
>>>>
>>>> -----Original Message-----
>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>> Sent: Friday, November 06, 2015 4:02 PM
>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>> Cc: 'Walter Hersom' <whersom at bristol-inst.com>;
>>>> salgera at bristol-inst.com; Xiaqing Li <xl79 at phy.duke.edu>
>>>> Subject: Re: Unit is ready
>>>>
>>>> Dear John
>>>>
>>>> Thanks for your quick reply.
>>>>
>>>> You mean the higher wavelength reading is totally due to the laser
>> itself?
>>>>
>>>> I mean 'by hand' is I literately holding laser fiber by hand and
>>>> put it at the entrance of fiber input hole.
>>>> So my hand is not stable, but not sure why it can produce something
>>>> at level of 20ms.
>>>>
>>>> I maybe able to check it with the 3900s laser we have been always
>>>> using with the wavemeter It should be pretty stable and has width
>>>> <40GHz refer to
>>>> http://www.spectra-physics.com/products/tunable-lasers/3900s
>>>>
>>>> What about the error 13 flashing by every time when I turn it on?
>>>>
>>>> Zhiwen
>>>>
>>>> On 11/6/2015 1:59 PM, John Theodorsen wrote:
>>>>> Dear Zhiwen,
>>>>>
>>>>> The 20 microsecond amplitude modulation envelope on the input
>>>>> signal is probably the problem here.  It may be causing the
>>>>> hysteresis-biased detector circuit to miss fringes.  As I
>>>>> previously said, missed input fringes would result in a higher
>>>>> wavelength reading.  I suspect your diode laser has noise/ripple
>>>>> on its power
>>> supply.
>>>>>
>>>>> Also, what do you mean you're holding the fiber up to the input
>>>>> 'by
>>> hand'?
>>>>> Can you send a photo of this situation, please?  The wavemeter
>>>>> depends on a stable, highly-collimated beam.
>>>>>
>>>>> The only way to tell model difference is the detectors on the board.
>>>>> If they are the same (both blue) then it's a VIS.  If they're
>>>>> different, it's NIR or IR.  If you're around 800nm, it doesn't
>>>>> matter if the switch is set for NIR or VIS.  But it's a good idea
>>>>> to make it correct, in case you migrate below 600 or above 1100nm,
>>>>> where it might
>>>> make a difference.
>>>>>
>>>>> Zhiwen, I sincerely believe you will be wasting your money sending
>>>>> the instrument back here.  Checking first why your 795nm laser has
>>>>> a modulation envelope issue is most important.  Also, a stable
>>>>> mounting arrangement for the fiber-coupled laser will be important.
>>>>> If these issues cannot be solved, you will not be able to use this
>>>>> laser with your
>>>> wavemeter anyway.
>>>>>
>>>>> Best regards,
>>>>>
>>>>> John
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> -----Original Message-----
>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>> Sent: Friday, November 06, 2015 12:18 PM
>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>> Cc: 'Walter Hersom' <whersom at bristol-inst.com>;
>>>>> salgera at bristol-inst.com
>>>>> Subject: Re: Unit is ready
>>>>>
>>>>> hi,John
>>>>>
>>>>> I had my 795+-0.2nm laser on, then I hold my laser fiber to the
>>>>> fiber input by hand because the two connectors don't match.
>>>>> The display reads wavelength most time over 800nm and not stable.
>>>>> The input signal at pin 1 can be seen from the photo attached.
>>>>>
>>>>> By the way, how can tell my WA1000 is VIS or NIR model?
>>>>> Is it very important to set "model" switch correctly accordingly?
>>>>>
>>>>> Thanks
>>>>>
>>>>> Zhiwen
>>>>>
>>>>> On 11/6/2015 8:19 AM, John Theodorsen wrote:
>>>>>> Dear Zhiwen,
>>>>>>
>>>>>> Sorry, I was on vacation Wednesday and Thursday.  Thank you for
>>>>>> the reference signal photo.  Yes; 4.5 volts is perfect.  However,
>>>>>> from my writings below, I had also recommended checking pin 1,
>>>>>> the
> input.
>>>>>> If there is feedback or other modulation, the sine wave will not
>>>>>> be beautiful and perfect like it is for the reference laser.
>>>>>> And, if you are missing input fringes, it will yield a reading
>>>>>> that will be high in wavelength, which is the symptom you report.
>>>>>>
>>>>>> Are you sure you don't want to check pin 1?  It should be very
simple.
>>>>>> Look at different time scales; 1 microsecond, 100 microseconds,
>>>>>> 10 milliseconds,
>>>>>> 1 second, and see if the envelope looks just like pin 2
>>>>>> (reference) at the same time scale.  If there are imperfections
>>>>>> in the sine wave for pin 1, then that is your answer, and I still
>>>>>> strongly suspect this as the
>>>>> cause.
>>>>>>
>>>>>> You may ship the instrument back to us if you like, and I will
>>>>>> input a long coherence-length, feedback-resistant laser into the
>> instrument.
>>>>>>
>>>>>> Best regards,
>>>>>>
>>>>>> John
>>>>>>
>>>>>> -----Original Message-----
>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>> Sent: Tuesday, November 03, 2015 6:17 PM
>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>> Subject: Re: Unit is ready
>>>>>>
>>>>>> Dear John
>>>>>>
>>>>>> Sorry for the long silence. I was too busy with other things.
>>>>>> Please see the attached photo showing the pin 1 signal of D15
>>>>>> connector on the rear panel.
>>>>>> I believe the  4.5v peak to peak reference signal should be
>>>>>> strong
>>>> enough?
>>>>>> I couldn't check input signal on pin 1 because we can't turn on
>>>>>> any laser yet.
>>>>>> I guess I am ready to ship it back you for a thorough check and
>>>>>> we would be happy to pay more if it's not related to the
>>>>>> alignment and
>>>>> calibration.
>>>>>>
>>>>>> Thanks
>>>>>>
>>>>>> Zhiwen
>>>>>>
>>>>>>
>>>>>> On 9/17/2015 8:42 AM, John Theodorsen wrote:
>>>>>>> Hi Zhiwen,
>>>>>>>
>>>>>>> You can send the unit back if you want.  However, if the problem
>>>>>>> is not related to the alignment and calibration that Bristol
>>>>>>> did, there would be a charge for the work; probably in the 200
>>>>>>> to 500 dollar range.  I still strongly recommend:
>>>>>>>
>>>>>>> -checking pin 1 and pin 2 of the D15 connector on the rear panel.
>>>>>>> This will tell you a lot about whether there is feedback into
>>>>>>> the diode laser, and whether the fringe amplitude for the
>>>>>>> reference laser is
>>>>>> adequate.
>>>>>>>
>>>>>>> -trying a long-coherence-length laser.
>>>>>>>
>>>>>>> It seems that your reported problems may have coincided with the
>>>>>>> installation of the new belt.  Usually, when there is a problem,
>>>>>>> one should first investigate what has recently changed.  And
>>>>>>> usually, the cause is 'single-point' - one thing, whether it's
>>>>>>> feedback, or the belt, or something else, is usually the cause.
>>>>>>>
>>>>>>> Let me know what you want to do.  If you do send the unit over,
>>>>>>> please make sure that it is packed very carefully.
>>>>>>>
>>>>>>> Best regards,
>>>>>>>
>>>>>>> John
>>>>>>>
>>>>>>> -----Original Message-----
>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>> Sent: Wednesday, September 16, 2015 4:41 PM
>>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>>> Subject: Re: Unit is ready
>>>>>>>
>>>>>>> Hi, John
>>>>>>>
>>>>>>> On the manual page 48, the "Table A-2: Auto-resolution as a
>>>>>>> function of laser bandwidth"
>>>>>>> says 150Ghz frequency width means 0.01 nm resolution This seems
>>>>>>> good enough to our laser of 795+-0.2nm?
>>>>>>>
>>>>>>> Also I don't have a HeNe laser to try.
>>>>>>> The regular use for this wavemeter is a TI:SAPPHIRE LASER here
>>>>>>> which has line width <40 GHz
>>>>>>> http://www.spectra-physics.com/products/tunable-lasers/3900s#spe
>>>>>>> c s But we can't run that laser for a while due to some safety
>>>>>>> reason.
>>>>>>>
>>>>>>> The thing I am worried more is that these errors flashing by
>>>>>>> seems indicating something more than just calibration.
>>>>>>>
>>>>>>> We are not in hurry using the wavemeter any more, but do want it
>>>>>>> fixed completely.
>>>>>>>
>>>>>>> Thanks
>>>>>>>
>>>>>>> Zhiwen
>>>>>>>
>>>>>>> On 9/15/2015 12:24 PM, John Theodorsen wrote:
>>>>>>>> Hi Zhiwen,
>>>>>>>>
>>>>>>>> You have my apologies for taking this long to respond; there is
>>>>>>>> no excuse for my delay.
>>>>>>>>
>>>>>>>> This laser may be too broad for the WA-1500 to read it easily,
>>>>>>>> but let's investigate.
>>>>>>>>
>>>>>>>> 0.2nm corresponds to a frequency width of about 100 GHz.  In
>>>>>>>> general, the
>>>>>>>> WA-1500 was always much-better-suited for narrow-linewidth lasers.
>>>>>>>> There is a table in the Burleigh manual that describes
>>>>>>>> operation out to the Terahertz range, but I do not believe it
>>>>>>>> always worked out that
>>>>>>> far.
>>>>>>>>
>>>>>>>> I recommend trying a HeNe laser first, to see if this removes
>>>>>>>> the
>>>>>> problem.
>>>>>>>> I suspect that if we tried that here, it would work OK.
>>>>>>>>
>>>>>>>> Let me know what you find.  If the HeNe works OK, there may be
>>>>>>>> an adjustment you can perform with an oscilloscope, which I can
>>>>>>>> walk you through.  But first, try a long-coherence laser for
>>>>>>>> me,
> please.
>>>>>>>>
>>>>>>>> Best regards,
>>>>>>>>
>>>>>>>> John
>>>>>>>>
>>>>>>>> -----Original Message-----
>>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>>> Sent: Thursday, September 10, 2015 12:03 PM
>>>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>>>> Subject: Re: Unit is ready
>>>>>>>>
>>>>>>>> hi, John
>>>>>>>>
>>>>>>>> The photo shows the original broken belt and the new belt.
>>>>>>>> The new belt has similar width and thickness, but shorter.
>>>>>>>> So I gave it a try first, maybe we can find longer belt to
>>>>>>>> replace it
>>>>>>> later.
>>>>>>>> The belt I ordered is from http://www.turntablebasics.com/
>>>>>>>>
>>>>>>>> The laser I used is 795nm diode laser with width 0.2nm and its
>>>>>>>> fiber is mounted and aimed at the input hole directly.
>>>>>>>>
>>>>>>>> I haven't used oscilloscope to checked things. (could do it
>>>>>>>> later) But overall my guess is that the problem might be more
>>>>>>>> complicated And I am short of manpower working on this now.
>>>>>>>>
>>>>>>>> Do you think it's better sent back to you for a thorough
>>>>>>>> check/repair/calibration?
>>>>>>>> Would there be additional cost?
>>>>>>>>
>>>>>>>> Thanks
>>>>>>>>
>>>>>>>> Zhiwen
>>>>>>>>
>>>>>>>> On 9/8/2015 8:29 AM, John Theodorsen wrote:
>>>>>>>>> Hi Zhiwen,
>>>>>>>>>
>>>>>>>>> I would not send it here yet.  I would suggest to get an
>>>>>>>>> oscilloscope, and check the reference (pin 2) and input (pin
>>>>>>>>> 1) signals at the D15
>>>>>>>> connector.
>>>>>>>>>
>>>>>>>>> Since you're also getting the +/- signal at the left of the
>>>>>>>>> screen, this can mean input laser instability.  Are you sure
>>>>>>>>> there is no feedback into your diode laser, and no modulation
>>>>>>>>> on the
>>> input?
>>>>>>>>> Checking the input at pin 1 and reference at pin 2 can tell
>>>>>>>>> you a
>>> lot.
>>>>>>>>>
>>>>>>>>> Try this first.
>>>>>>>>>
>>>>>>>>> Can you show me the belt?  Is it flexible and thin?  Since the
>>>>>>>>> belt is all that changed, I am suspicious!
>>>>>>>>>
>>>>>>>>> I have confidence that you can find the problem without more
>> returns!
>>>>>>>>>
>>>>>>>>> Best regards,
>>>>>>>>>
>>>>>>>>> John
>>>>>>>>>
>>>>>>>>> -----Original Message-----
>>>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>>>> Sent: Friday, September 04, 2015 6:02 PM
>>>>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>>>>> Subject: Re: Unit is ready
>>>>>>>>>
>>>>>>>>> hi, John
>>>>>>>>>
>>>>>>>>> I put a new belt in, but it doesn't fix all problem.
>>>>>>>>> Here is a video showing the problem
>>>>>>>>> https://www.dropbox.com/s/x6sanche2iogpux/VID_20150904_171243.mp4?
>>>>>>>>> d
>>>>>>>>> l
>>>>>>>>> =
>>>>>>>>> 0 I shine the unit with a 795nm narrow laser, then turn on the
> unit.
>>>>>>>>> You can see error 13 and error 12 flash by, and the resulting
>>>>>>>>> wavelength is ~835nm Do you know why?
>>>>>>>>> Should I send it back to you for further check and calibration?
>>>>>>>>>
>>>>>>>>> Thanks
>>>>>>>>>
>>>>>>>>> Zhiwen
>>>>>>>>>
>>>>>>>>> On 8/10/2015 11:08 AM, Zhiwen Zhao wrote:
>>>>>>>>>> Hi, John
>>>>>>>>>>
>>>>>>>>>> The original belt is 445x4x0.4mm.
>>>>>>>>>> The uline belt seems not a perfect fit.
>>>>>>>>>> One of our staff has ordered something which might work.
>>>>>>>>>> I will let you know how it goes.
>>>>>>>>>>
>>>>>>>>>> Thanks
>>>>>>>>>>
>>>>>>>>>> Zhiwen
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On 8/10/2015 8:51 AM, John Theodorsen wrote:
>>>>>>>>>>> Zhiwen,
>>>>>>>>>>>
>>>>>>>>>>> How about one of these?
>>>>>>>>>>>
>>>>>>>>>>> http://www.uline.com/BL_3758/ESD-Rubber-Bands?keywords=rubbe
>>>>>>>>>>> r
>>>>>>>>>>> %
>>>>>>>>>>> 2
>>>>>>>>>>> 0
>>>>>>>>>>> b
>>>>>>>>>>> a
>>>>>>>>>>> n
>>>>>>>>>>> d
>>>>>>>>>>> s
>>>>>>>>>>>
>>>>>>>>>>> S-14145, 1/8 x 12, looks like it might be OK  (but, I can't
>>>>>>>>>>> tell if 12" is overall circumference, or 1/2 circumference?).
>>>>>>>>>>>
>>>>>>>>>>> --John
>>>>>>>>>>>
>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>>>>>> Sent: Friday, August 07, 2015 6:06 PM
>>>>>>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>>>>>>> Subject: Re: Unit is ready
>>>>>>>>>>>
>>>>>>>>>>> belt photo
>>>>>>>>>>>
>>>>>>>>>>> On 8/7/2015 4:54 PM, Zhiwen Zhao wrote:
>>>>>>>>>>>> hi,John
>>>>>>>>>>>>
>>>>>>>>>>>> I just got time to check it.
>>>>>>>>>>>>
>>>>>>>>>>>> The rubber band is broken as expected and I took a photo.
>>>>>>>>>>>> The white rubber band seems much shorter than the original
>>>>>>>>>>>> black
>>>>>> belt.
>>>>>>>>>>>> (And I haven't found other pieces of the broken white
>>>>>>>>>>>> rubber
>>>>>>>>>>>> band.) Could it be the rubber band was stretched too much?
>>>>>>>>>>>>
>>>>>>>>>>>> Do you have or know where to find a good replace band
>>>>>>>>>>>> similar to the
>>>>>>>>>>> original one?
>>>>>>>>>>>>
>>>>>>>>>>>> Thanks
>>>>>>>>>>>>
>>>>>>>>>>>> Zhiwen
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On 8/7/2015 4:47 PM, John Theodorsen wrote:
>>>>>>>>>>>>> Dear Zhiwen,
>>>>>>>>>>>>>
>>>>>>>>>>>>> How is this going?
>>>>>>>>>>>>>
>>>>>>>>>>>>> Best regards,
>>>>>>>>>>>>>
>>>>>>>>>>>>> John
>>>>>>>>>>>>>
>>>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>>>> From: John Theodorsen
>>>>>>>>>>>>> [mailto:jtheodorsen at bristol-inst.com]
>>>>>>>>>>>>> Sent: Friday, July 31, 2015 12:29 PM
>>>>>>>>>>>>> To: 'Zhiwen Zhao' <zwzhao at jlab.org>
>>>>>>>>>>>>> Subject: RE: Unit is ready
>>>>>>>>>>>>>
>>>>>>>>>>>>> OK.  Unfortunately, that rubber band may fall off again.
>>>>>>>>>>>>> You may want to experiment with a slightly wider one,
>>>>>>>>>>>>> which may stay centered better.  Also, note that you can
>>>>>>>>>>>>> slide the motor mount to adjust tension.  The belt/band
>>>>>>>>>>>>> should only be stretched maybe
>>>>>>>>>>>>> 10-15
>>>>>>>>> percent.
>>>>>>>>>>>>>
>>>>>>>>>>>>> I'm sorry to hear of the problem.  Hopefully, we can get
>>>>>>>>>>>>> it solved without a return trip!
>>>>>>>>>>>>>
>>>>>>>>>>>>> Best regards,
>>>>>>>>>>>>>
>>>>>>>>>>>>> John
>>>>>>>>>>>>>
>>>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>>>>>>>> Sent: Friday, July 31, 2015 12:17 PM
>>>>>>>>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>>>>>>>>> Cc: 'Walter Hersom' <whersom at bristol-inst.com>; 'Sue Hosbach'
>>>>>>>>>>>>> <shosbach at bristol-inst.com>; 'Chris Flower'
>>>>>>>>>>>>> <cflower1 at gmail.com>; 'Xiaqing Li' <xl79 at phy.duke.edu>
>>>>>>>>>>>>> Subject: Re: Unit is ready
>>>>>>>>>>>>>
>>>>>>>>>>>>> hi, John
>>>>>>>>>>>>>
>>>>>>>>>>>>> Yes, that's the one.
>>>>>>>>>>>>> You told me in one of previous email with a photo that you
>>>>>>>>>>>>> replaced the belt with a standard rubber band.
>>>>>>>>>>>>>
>>>>>>>>>>>>> We will follow your suggestion to check and let you know.
>>>>>>>>>>>>>
>>>>>>>>>>>>> Zhiwen
>>>>>>>>>>>>>
>>>>>>>>>>>>> On 7/31/2015 12:08 PM, John Theodorsen wrote:
>>>>>>>>>>>>>> Hi Zhiwen,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> This is bizarre!
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> So, I can't remember, but on one of the Burleigh
>>>>>>>>>>>>>> wavemeters Bristol recently repaired, I used a rubber
>>>>>>>>>>>>>> band to replace a broken drive belt; was that one yours?
>>>>>>>>>>>>>> If not, what did your technicians use to replace the
>>>>>>>>>>>>>> drive belt?  To my knowledge, these are no longer for
>>>>>>>>>>>>>> sale from EXFO (the company that bought Burleigh in
>>>>>>>>> 2000).
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> To have no error 13 on receipt, then to have a scan error
>>>>>>>>>>>>>> and fix the drive train, and *then* to have error 13, is
>>>>>>>>>>>>>> the truly strange thing, since error
>>>>>>>>>>>>>> 13 usually doesn't just 'pop up' without either sitting
>>>>>>>>>>>>>> for a long time (years), or some sort of physical trauma
>>>>>>>>>>>>>> that misaligns or breaks something in the interferometer.
>>>>>>>>>>>>>> Can you diagnose the problem more thoroughly?  Try pin 2
>>>>>>>>>>>>>> on the
>>>>>>>>>>>>>> D15 connector on the rear panel, as before.  At the exit
>>>>>>>>>>>>>> of the interferometer, block one beam path, then the
>>>>>>>>>>>>>> other, and see if they are superimposed, etc.  Remove the
>>>>>>>>>>>>>> cover shielding the retroreflector carriage, and see if
>>>>>>>>>>>>>> they are
>>>>>>>>>>> still in place.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> The only other thing that occurs to me is that maybe an
>>>>>>>>>>>>>> optic fell off, rendering one of the interferometer arms
>>>> non-reflective?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Let me know what you find.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Best regards,
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> John
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>>>>>>>>> Sent: Friday, July 31, 2015 11:50 AM
>>>>>>>>>>>>>> To: John Theodorsen <jtheodorsen at bristol-inst.com>
>>>>>>>>>>>>>> Cc: 'Walter Hersom' <whersom at bristol-inst.com>; 'Sue Hosbach'
>>>>>>>>>>>>>> <shosbach at bristol-inst.com>; Chris Flower
>>>>>>>>>>>>>> <cflower1 at gmail.com>; Xiaqing Li <xl79 at phy.duke.edu>
>>>>>>>>>>>>>> Subject: Re: Unit is ready
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Hi, John
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> We got the unit back and it initially worked without problem.
>>>>>>>>>>>>>> But after a few days of normal use, the wavemeter was
>>>>>>>>>>>>>> displaying Error
>>>>>>>>>>> 30.
>>>>>>>>>>>>>> "Interferometer scan motion error. Either the scan
>>>>>>>>>>>>>> assembly is not moving or the scan timing detector is
> malfunctioning."
>>>>>>>>>>>>>> The manual suggests removing the board and checking the
>>>>>>>>>>>>>> drive belt, which is what the technicians replaced recently.
>>>>>>>>>>>>>> It was restarted and instead of error 30 it then
>>>>>>>>>>>>>> displayed Error 13, the same as before.
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Do you have any suggestion?
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Thanks
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> Zhiwen
>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>> On 7/10/2015 1:53 PM, John Theodorsen wrote:
>>>>>>>>>>>>>>> Thank you, Zhiwen.  We will ship according to your exact
>>>>>>>>>>>>>>> instructions on the PO.  I packed it extremely well for
>>>>>>>>>>>>>>> the return
>>>>>>>>>>> trip.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Best regards,
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> John
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> -----Original Message-----
>>>>>>>>>>>>>>> From: Zhiwen Zhao [mailto:zwzhao at jlab.org]
>>>>>>>>>>>>>>> Sent: Friday, July 10, 2015 1:39 PM
>>>>>>>>>>>>>>> To: John Theodorsen
>>>>>>>>>>>>>>> Cc: 'Walter Hersom'
>>>>>>>>>>>>>>> Subject: Re: Unit is ready
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> hi, John
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> The PO is in and I think it should reach you next week.
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> For return shipping, please use fedex ground with $5k
>>>>>>>>>>>>>>> insurance and FedEx account 1741-1397-1 I put it on the
>>>>>>>>>>>>>>> PO also
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Let me know once you have a tracking
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Thanks
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> Zhiwen
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>> On 7/10/2015 10:34 AM, Zhiwen Zhao wrote:
>>>>>>>>>>>>>>>> That's great! Thanks!
>>>>>>>>>>>>>>>> I am setting up the PO and will let you know.
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> Zhiwen
>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>> On 7/10/2015 9:45 AM, John Theodorsen wrote:
>>>>>>>>>>>>>>>>> Dear Zhiwen,
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> The unit is ready.  The cost is the usual calibration
rate:
>>>>>>> $700.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Please issue a PO and I can ship once received.
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> Best regards,
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>>> John
>>>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>>
>>>>>>>>>>>>>>
>>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>
>>>>>
>>>>
>>>
>>
>



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