[time-nuts] Re: Digging deeper into the Cs tube

[Tom Van Baak]

For those of you [1] who missed Skip's cesium beam tube photos, see:

 Â Â Â  http://leapsecond.com/u/skip/CBT-2023/inside.html

The full collection of his CBT postings is here:

 Â Â Â  http://leapsecond.com/u/skip/

 > With the great pix of the wires going in can you please make a cheat 
sheet of each lead.

Paul, it's documented in detail in chapter 8 of the 5061B op/service 
manual. If you don't want to read the full manual I've placed a copy of 
the CBT diagram-only here (see also attached image):

http://leapsecond.com/museum/hp5061b/5061B-Ch8-Pg5-Circuit-Diagrams-1700x850.jpg

/tvb

[1] members using compact digest mode don't get attachments.


On 9/16/2023 8:40 AM, paul swed via time-nuts wrote:
> More exciting pix. to add to the collection.
> Couple of questions.
> The bands of copper running along I think the wave guide. C field.
> What are the 8 or so wires coiled in a figure 8?
> Lastly I have seen C tubes with cut off wires. I think ebay for cheap.
> (Because their dead. Chuckle)
> With the great pix of the wires going in can you please make a cheat sheet
> of each lead. I would be happy to do it if you would like.
> Thinking ppt with simple thermistor cfield etc.
> Might make it tempting to grab a cut wire unit. Nutty as that seems and the
> worst possible gamble.
> Best regards Skip and thanks for sharing.
> Paul
> WB8TSL
>
>
> On Sat, Sep 16, 2023 at 1:56 AM Skip Withrow via time-nuts <
> time-nuts at lists.febo.com> wrote:
>
>> Hello Time-Nuts,
>> I took a second look at the Cs tube that I opened up recently and decided
>> to dig a little deeper.  Previously, after cutting a window in the mu metal
>> shield around the microwave waveguides, I found that there was another mu
>> metal shield under that.
>>
>> CsTube-1 - I decided to drill six strategic holes in the outer case so that
>> I could unscrew the fasteners for the outer mu metal shield to remove it
>> altogether.
>>
>> CsTube-2 - Shows the outer mu metal shield (with the window that I had cut
>> in it).  It was necessary to bend up the mounting flange a bit to clear
>> other fasteners.
>>
>> CsTube-3 - I cut a window in the second mu metal shield and found that the
>> microwave waveguides are wrapped in Kaption.  The shield fits very tight to
>> the bits that it encloses.
>>
>> CsTube-4 - The C-field coil is embedded in the Kapton wrap.  You can see
>> the copper stripes running lengthwise along the bottom of the tube.
>>
>> CsTube-5 - The microwave waveguide is at either end of the cut out window
>> (the screw heads appear to hold all the copper bits together to form the
>> waveguide.  You can see the rectangular hole that the beam passes through
>> as it travels through the waveguide from one of the tube to the other. I
>> suppose that I could remove the Kapton on the side to expose things better.
>>
>> Enjoy,
>> Skip Withrow
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