[Halld-tracking-hw] cable strip length

[Curtis A. Meyer]

Thanks Fernando -

  those do look familiar.  It also allows us t have standard  1/4" 
strips on the cable.

   Curtis
Fernando J. Barbosa wrote:
> Hi Curtis,
>
> The file, about a year old, is attached. Page 1 shows the connections.
>
> Best regards,
> Fernando
>
>
>
> Curtis A. Meyer wrote:
>> Email is a terrible filing system. Could you resend that drawing?
>>   thanks -- curtis
>> Fernando J. Barbosa wrote:
>>> Hi Curtis,
>>>
>>> According to Slava, it is not possible to place all the connectors 
>>> as there is no space for 3 or 2 wire diameters between the connectors.
>>>
>>> I was just reminded by Gerard that I sent you a drawing some time 
>>> ago with the cables soldered to a PCB that fit between the pins on 
>>> the connector. The cables would be on the same plane as the HVB 
>>> rather than perpendicular to it. In this manner, you have a lot of 
>>> space between the connectors and it may be easier for installation. 
>>> The 0.25" crimp tubes should also work well here.
>>>
>>> Best regards,
>>> Fernando
>>>
>>> Curtis A. Meyer wrote:
>>>> Hi Fernando -
>>>>
>>>>  the following link shows some pictures of wires hooked up (towards 
>>>> the bottom):
>>>>
>>>> http://www.jlab.org/Hall-D/software/wiki/index.php/CDC_Electrical_Hook_Up_Photos 
>>>>
>>>>
>>>> looking at these, it looks more like three wire diameters to get 
>>>> them bent unless we can
>>>> come up with something else clever (an l-shaped draid holder?)
>>>>
>>>>   curtis
>>>> Fernando J. Barbosa wrote:
>>>>> Hi Curtis,
>>>>>
>>>>> Thanks for the reply. It will be hard to find anything for the 
>>>>> braid to be less than the length you already have. With a 
>>>>> requirement of about 1.2 cm for the soldering and allowing 2 wire 
>>>>> diameters for the bending, the required space on both sides of the 
>>>>> connector becomes 1.2 cm + 5 mm = 1.7 cm. Would 2 wire diameters 
>>>>> work? Should Slava consider 2 cm?
>>>>>
>>>>> Thanks and best regards,
>>>>> Fernando
>>>>>
>>>>>
>>>>>
>>>>> Curtis A. Meyer wrote:
>>>>>> Hi Fernando -
>>>>>>
>>>>>>     based on your references, we found a reasonably priced tool that
>>>>>> can set any length of strip you want. Assuming the following 
>>>>>> represents
>>>>>> the end of the wire:   A is the stripped length of the conducting 
>>>>>> core, B
>>>>>> is the length of the teflon insulator and C is the stripped 
>>>>>> length of the outer
>>>>>> braid.
>>>>>>
>>>>>>                                                      
>>>>>> eeeeeeeeeeeeeeeee      teflon
>>>>>>                                         
>>>>>> bbbbbbbbbbbbbbbbbbbbbb     braid
>>>>>>                                eeeeeeeeeeeeeeeeeeeeeeeeeeeeee     
>>>>>> teflon
>>>>>>                       xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx    
>>>>>> conducting core
>>>>>>                                 eeeeeeeeeeeeeeeeeeeeeeeeeeeeee    
>>>>>> teflon
>>>>>>                                          bbbbbbbbbbbbbbbbbbbbbb   
>>>>>> braid
>>>>>>                                                      
>>>>>> eeeeeeeeeeeeeeeeee    teflon
>>>>>>
>>>>>>                      |-- A--|-- B --|-- C -- |
>>>>>>
>>>>>> The standard stripper we had set A=B=C=6mm. This is no longer 
>>>>>> necessary,
>>>>>> but we need some feel for what reasonable lengths are. We could 
>>>>>> probably solder
>>>>>> with A=3mm. The insulation on B probably needs to be of similar 
>>>>>> length (3-4mm),
>>>>>> and then the question comes to the outer braid.
>>>>>>
>>>>>> Currently, we are using some crimp on tubes to help solder to the 
>>>>>> board. The only
>>>>>> length that we are able to find for these is 6mm. If someone 
>>>>>> knows of a source of
>>>>>> shorter pieces that are not outrageously expensive, that would 
>>>>>> control this length.
>>>>>> Lacking that, it appears that our current solution would need C=6mm.
>>>>>>
>>>>>> The above dimensions have a PC board that extends about 1.2 to 
>>>>>> 1.3 cm beyond
>>>>>> the connector on both sides of the connector. It is also 
>>>>>> important to note that the
>>>>>> wires themselves extend beyond the board as it takes some space 
>>>>>> to bend them
>>>>>> through 90 degrees so that they can go through the swiss cheese 
>>>>>> plate.
>>>>>>
>>>>>> That all said, I think that there is some hope of shortening C if 
>>>>>> an appropriate
>>>>>> part can be obtained.
>>>>>>
>>>>>>   - Curtis
>>>>>>
>>>>>> Fernando J. Barbosa wrote:
>>>>>>> Hello everyone,
>>>>>>>
>>>>>>> I need to know what is your final spec for the stripping of the 
>>>>>>> coax. This is needed before Slava can proceed with the final 
>>>>>>> placement of the preamp connectors due to spacing.
>>>>>>>
>>>>>>> Best regards,
>>>>>>> Fernando
>>>>>>
>>>>>>
>>>>
>>>>
>>
>>


-- 
Prof. Curtis A. Meyer		Department of Physics
Phone:	(412) 268-2745		Carnegie Mellon University
Fax:	(412) 681-0648		Pittsburgh PA 15213-3890 
cmeyer at ernest.phys.cmu.edu	http://www.curtismeyer.com/