I doubt that a third wire would be anything more than a floating shield and=
 could be connected to any point in the circuit.  Differential simply means=
 measuring the difference between two inputs. Those inputs may or may not b=
e referenced to ground.   ( At least until they are hooked to the circuit )
99guspuppet

> On Feb 9, 2012, at 9:38 AM, Electron wrote:
>=20
>=20
> But when we talk about differential sensor, we mean 3 wires, right?
> I mean, not only the two complementary signals, but a ground MUST be
> there, else it won't be a differential sensor.. am I right?
>=20
> Cheers,
> Mario
>=20
>=20

--=20
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