[time-nuts] Basic TIC measurement

Joseph Gray jgray at zianet.com
Wed Oct 7 17:23:09 UTC 2009


Actually, when I got the 8140 a few years ago, I modded it to remove
the DC from the rear output. It was designed to power external
modules, which I don't have and don't need.

Somewhere I have a copy of the manual, but I downloaded yours in case
I can't find mine.


Joe Gray

On Wed, Oct 7, 2009 at 2:37 AM,  <GandalfG8 at aol.com> wrote:
> Morning Joe
> Don't forget either that the 8140 as supplied has a DC supply for the  line
> taps superimposed on the rear panel sinusoidal outputs.
> However, the A4 distribution amp/output PCB was also used in  several other
> Spectracom products, including the 8130 and 8164, with  component
> identification always remaining the same, as far as I can tell anyway,  but with link
> placement and filter values changing to suit  the application.
> If you compare, for example, the A4 schematics from the 8140 and 8164
> manuals you will see that removing the DC bias is quite straightfoward.
> It would also be straightforward to set the divider output links on  the
> 8140 A4 as per the 8164 A4 to provide the four  different sinusoidal output
> frequencies to the rear  panel although three of the four output filters would
> also  need to be modified to suit the changed frequencies.
> The good news is that all the required component values are also in the
> 8164 manual:-)
> I assume you have the 8140 manual but if not it's available for download
> from the Spectracom site, a simple registration is required, or I've uploaded
>  both for anyone that might be interested.....
> _http://rapidshare.com/files/289729072/Spectracom_8140_2v1_0594.pdf_
> (http://rapidshare.com/files/289729072/Spectracom_8140_2v1_0594.pdf)
> _http://rapidshare.com/files/289730121/Spectracom_8164_3v1_0893.pdf_
> (http://rapidshare.com/files/289730121/Spectracom_8164_3v1_0893.pdf)
> regards
> Nigel
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