Hi,
Check this out if you need to make scope measurements on 'phone line' or
other floating circuits.....
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Junk.
1. There is no real repeatable so-called X1 or X10 capability for the
thing unless each circuit it's connected to has exactly the same
Zout.
2. There is no X1, X10 correspondence between the output voltage and
the position of the X1 - X10 switch with the same input voltage to
the probe. For the PS2505 the CTR changes by about 2:1 for a 10:1
variation in input current below 5mA, with the absolute CTR varying
over about a 4:1 range from unit to unit.
3. It's a _bad_ idea to force forward current into a watch battery and,
I would suspect, a _very_ bad idea to subject it to the 100V reverse
polarity half-sine it'll get across it from the ringing signal.
4. There must be _something_ else... ;-)