[time-nuts] Racal Dana Switches

Sam Reaves sam.reaves at gmail.com
Sat May 18 22:00:40 EDT 2013


On Sun, Apr 22, 2012 at 8:00 AM, <time-nuts-request at febo.com> wrote:

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> Today's Topics:
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>   1.  About Racal Dana tactile switches (Fabio Eboli)
>   2. PRS-10 input and output calibrations (Magnus Danielson)
>
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> Message: 1
> Date: Sun, 22 Apr 2012 13:44:41 +0200
> From: Fabio Eboli <fabioeb at quipo.it>
> To: time-nuts at febo.com
> Subject: [time-nuts]  About Racal Dana tactile switches
> Message-ID: <20120422134441.11826g3ah983h9ux at webmail.micso.net>
> Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes";
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> Hello, this is my first message on this list,
> I've read the recent thread about racal dana's switches,
> this is the way i've done it:
>
> http://imageshack.us/photo/my-images/194/pulsantenuovo1r.jpg/
>
> in this thread more details:
>
>
> http://www.eevblog.com/forum/product-reviews-photos-and-discussion/racal-dana-1992-teardown/msg90950/#msg90950
>
> A little crude but in a pair of hours i swapped all the switches.
> To obtain the proper tip shape to fit the original caps,
> i cutted a cross in a 2mm thick little brass plate and
> fixed it to a soldering iron, found the correct
> flow temperature of the plastic and the work was simple.
>
> The switches are normal 6x6mm tactile, only they tend to bounce sometime.
>
> Fabio.
>
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> ------------------------------
>
> Message: 2
> Date: Sun, 22 Apr 2012 13:49:06 +0200
> From: Magnus Danielson <magnus at rubidium.dyndns.org>
> To: Time-Nuts <time-nuts at febo.com>
> Subject: [time-nuts] PRS-10 input and output calibrations
> Message-ID: <4F93F032.2040608 at rubidium.dyndns.org>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
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> Fellow time-nuts,
>
> Anyone who has tried to calibrate the PPS input and PPS output
> interpolators of the PRS-10?
>
> The output calibration seems pretty easy to do, just a TIC to measure
> the PPS to 10 MHz and then sweep through the output delay values to
> cover a little more than the 400 ns range.
>
> The input calibration would be something in the similar way, a simpel
> method would be to use a coax cable between output and input, and then
> use the internal output offset to measure the range of the input
> interpolator. However, the input interpolator is a decade better than
> the output interpolator. However, considering that I have a 5359A just
> waiting to be used, I think I use a fixed output PPS delay and trigger
> the 5359A with and then sweep that one.
>
> I would then use the collected data to find suitable correction values.
>
> Comments and suggestions? Experience?
>
> Cheers,
> Magnus
>
>
>
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> End of time-nuts Digest, Vol 93, Issue 114
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