[Polhe3] wavemeter info
Zhiwen Zhao
zwzhao at jlab.org
Wed Nov 11 17:06:01 EST 2015
Hi, All
I am not sure what's the status of our jlab wavemeter used for density
measurement.
Here I have the company providing some info for their new models with
discount.
Zhiwen
-------- Forwarded Message --------
Subject: RE: Unit is ready
Date: Wed, 11 Nov 2015 11:47:10 -0500
From: Walter Hersom <whersom at bristol-inst.com>
To: 'Zhiwen Zhao' <zwzhao at jlab.org>
CC: 'Xiaqing Li' <xl79 at phy.duke.edu>, 'John Theodorsen'
<jtheodorsen at bristol-inst.com>
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#spec
>>>>>> 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=rubber
>>>>>>>>>> %
>>>>>>>>>> 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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