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From: RGR-74 on 24 Nov 2009 04:35
Hello everyone,
I have a problem,few days ago, I have to be repaired
an interface called PC Acq. Mod DM302 manufactured by SPEX;
This card receives a signal from an optical part (which is directly
connected to a polarizer) and sends its output signal to the polarizer
(thus creating a feedback) some days no longer works;
The question is: anyone has any information on this card (DM302
manufactured by SPEX) for example, wiring diagrams and user manual.

Thanks to all
Joseph

www.baab.it/ik2umd/
From: Hans-Christian Becker on 24 Nov 2009 04:22
In article <ce0948e3-cc39-45ac-9b74-966693b73451(a)r31g2000vbi.googlegroups.com>,
RGR-74 <romano_74(a)libero.it> wrote:
>Hello everyone,
>I have a problem,few days ago, I have to be repaired
>an interface called PC Acq. Mod DM302 manufactured by SPEX;
>This card receives a signal from an optical part (which is directly
>connected to a polarizer) and sends its output signal to the polarizer
>(thus creating a feedback) some days no longer works;
>The question is: anyone has any information on this card (DM302
>manufactured by SPEX) for example, wiring diagrams and user manual.

I don't have schematics for the DM302, but I do know that it is a
preamplifier and discriminator for photon counting. Have you tried to
contact Spex/Jobin-Yvon?

--
Dr. Hans-Christian Becker
'96 VN750 SM5TLH KG6POK
Uppsala, Sweden
From: RGR-74 on 24 Nov 2009 08:36
On 24 Nov, 10:22, h...(a)fki030.fki.uu.se (Hans-Christian Becker) wrote:
> In article <ce0948e3-cc39-45ac-9b74-966693b73...(a)r31g2000vbi.googlegroups..com>,
>
> RGR-74  <romano...(a)libero.it> wrote:
> >Hello everyone,
> >I have a problem,few days ago, I have to be repaired
> >an interface called PC Acq. Mod DM302 manufactured by SPEX;
> >This card receives a signal from an optical part (which is directly
> >connected to a polarizer) and sends its output signal to the polarizer
> >(thus creating a feedback) some days no longer works;
> >The question is: anyone has any information on this card (DM302
> >manufactured by SPEX) for example, wiring diagrams and user manual.
>
> I don't have schematics for the DM302, but I do know that it is a
> preamplifier and discriminator for photon counting. Have you tried to
> contact Spex/Jobin-Yvon?
>
> --
> Dr. Hans-Christian Becker
> '96 VN750 SM5TLH KG6POK
> Uppsala, Sweden

Hello Hans,
I tried to contact the Spex, but I have not any response,
Unfortunately the documentation of this interface has been lost;
At this point I will make other checks and later I expand to other
control devices.
Thanks again
Joseph
From: Hans-Christian Becker on 24 Nov 2009 08:47
In article <02b23405-29ed-42bc-ae52-1f8975657955(a)e31g2000vbm.googlegroups.com>,
RGR-74 <romano_74(a)libero.it> wrote:

>I tried to contact the Spex, but I have not any response,
I am not surprised ...

>Unfortunately the documentation of this interface has been lost;
>At this point I will make other checks and later I expand to other
>control devices.

The input (at least in the configurations I have seen) takes pulses
from a photomultiplier operating in photon counting mode. The discriminator
then removes virtually all "dark" counts, and the output should (I think) be
pulses of uniform height that are fed to a counter.
Good luck,
Hans

--
Dr. Hans-Christian Becker
'96 VN750 SM5TLH KG6POK
Uppsala, Sweden
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