[time-nuts] FO Cables and Spectrometers

J. Forster jfor at quikus.com
Sat Mar 31 20:29:03 UTC 2012


Brooke,

Try eBay. I got mine ther (maybe from a guy in Utah). He was also sel;ling
similar spectrometers, but for a lot more money than Roland.

BTW, There are more Ocean Optics spectrometers available. If interested,
drop me a note off-list.

-John

==================


> Hi Achim:
>
> SMA RF connectors have a very limited life (number of matings) until they
> are worn out.  That probably doesn't apply to
> SMA threaded fiber optic connectors.
> Where can I get short fiber optic cables that mate with the Ocean Optics
> HR2000 Optical Spectrum Analyzer?
> http://www.prc68.com/I/ML-OSA.shtml#HR2000
>
> Have Fun,
>
> Brooke Clarke
> http://www.PRC68.com
> http://www.end2partygovernment.com/Brooke4Congress.html
>
>
> Achim Vollhardt wrote:
>> Dear John and all,
>>
>> I do work in high energy physics and we use LEMO and other standards.
>> For some years now, I have started to advertise
>> against LEMO (in particular the LEMO 00 size), as it is VERY sensitive
>> to mechanical defects and partial connection
>> (yes, you can ..). We have found very often defective LEMO connections,
>> which could only be detected via time domain
>> reflectometry. Or LEMO interfaces, which changed impedance significantly
>> when rotating them in the fully mated
>> position.. this list could be extended a lot more. And this famous click
>> when mating is inaudible in typical high
>> energy physics electronics barracks.. too much fan noise.
>>
>> In addition, for the very fast signals of modern DAQ systems, LEMO 00 is
>> just not up to speed (literally) anymore. If
>> size is not of ultimate importance, we switched to SMA, or SMC if size
>> matters.
>>
>> About this dreadful OPERA fiber connector:
>>
>> It very much looks like a FC connector. It has a polarisation nut and I
>> have to confess having misconnected them more
>> than once myself.
>> It might have been beneficial to shorten in this standard the thread
>> length so there is no possibility to engage the
>> thread (not even partially) when not properly aligned. As the thread is
>> indeed fairly long, you can do what seemed to
>> have happened in OPERA.
>>
>>
>> I acknowledge the importance of QA, but also some design-inherent
>> features like low power indications should be in
>> place to prevent these things from happening.
>>
>> Regards,
>> Achim
>>
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>
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