Duilio;

I would suggest going into a differential (or instrument) amp.  That
will maintain the fidelity of the noise that you may be hearing, and
give you an oportunity to amplify it neatly.  Also, the big pitfall is
the possibility of a ring occuring.  If you get a ring signal, the 90VP
( Approx, if I recall) is massive and will pop an unprotected part.
Some of the Analog Devices parts have high input ranges.  If in doubt,
use some series R's and a pair of TVS diodes to protect the part.

Chris Eddy

Duilio Foschi wrote:

> I'd like to investigate strange noise arriving to my CO line.
>
> Can I attach my scope to the CO line ?
>
> Are there risks I should be aware of ?
>
> Thank you
>
> Duilio Foschi