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By george i think you have something there Lee.
You can reduce the rating of the contacts by using a relay to do the
change over thing. But using a seperate switching element (ie power
transistor with fly wheel diode) to apply the Polarisation current.
I guess this adds the complexity of sequencing the switching and rewiring
relay.
Advantages could be that the reverse emf induced in the polarisation coil
generated as the polarising field collapses is fed back to the battery
(Assuming a battery with low enough internal resistance) so preventing
arcing and extending battery life. (Not sure how much though). As
switching contacts are not switching current they can be down rated.
Disadvantages would be that due to the amount of time required for the
sequencing. (Taking into account the time it takes for the polarising
field to collapse via back emf into the battery)more of the precious time
of precesion could be lost.
This effectivly brings the discusion into a bit of a circle and leaves us
looking at the proton rich fluid.
Just thoughts
Le Kirby
Quoting Lee Fraser :
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> The Proton Mag Forum
>
> Where did everybody go?
> =20
> Dale, thank you very much for the great index. Now if I only knew
> where =
> to find the content...
>
> http://www.geometrics.com/sci.html is the site where you can find
> =
> "Application Manual for Portable Magnetometers". Its in pdf and I
> think =
> about 1.7M. There's several other documents of interest here as
> well. =
> Look under literature on their home page. Some of it you will
> have to =
> order and some of it is available for download.
>
> Here is a note I prepared that you might find interesting. Jim
> =
> Koehler, I'd be very interested in your view on bifilar windings.
>
>
>
>
>
>
>
>
>
>
> __________________________________________________ ____________________
You can reduce the rating of the contacts by using a relay to do the
change over thing. But using a seperate switching element (ie power
transistor with fly wheel diode) to apply the Polarisation current.
I guess this adds the complexity of sequencing the switching and rewiring
relay.
Advantages could be that the reverse emf induced in the polarisation coil
generated as the polarising field collapses is fed back to the battery
(Assuming a battery with low enough internal resistance) so preventing
arcing and extending battery life. (Not sure how much though). As
switching contacts are not switching current they can be down rated.
Disadvantages would be that due to the amount of time required for the
sequencing. (Taking into account the time it takes for the polarising
field to collapse via back emf into the battery)more of the precious time
of precesion could be lost.
This effectivly brings the discusion into a bit of a circle and leaves us
looking at the proton rich fluid.
Just thoughts
Le Kirby
Quoting Lee Fraser :
>
> ------=_NextPart_001_002D_01BFBF25.0AC76C80
> Content-Type: text/plain;
> charset="Windows-1252"
> Content-Transfer-Encoding: quoted-printable
>
> The Proton Mag Forum
>
> Where did everybody go?
> =20
> Dale, thank you very much for the great index. Now if I only knew
> where =
> to find the content...
>
> http://www.geometrics.com/sci.html is the site where you can find
> =
> "Application Manual for Portable Magnetometers". Its in pdf and I
> think =
> about 1.7M. There's several other documents of interest here as
> well. =
> Look under literature on their home page. Some of it you will
> have to =
> order and some of it is available for download.
>
> Here is a note I prepared that you might find interesting. Jim
> =
> Koehler, I'd be very interested in your view on bifilar windings.
>
>
>
>
>
>
>
>
>
>
> __________________________________________________ ____________________