Back to results
US 5,493,070 AGranted
Measuring cable and measuring system
AssigneeHewlett-Packard Company
InventorSatoshi Habu
Life of this patent
Estimating the term…
Abstract
A cable is provided that is suitable for Kelvin connection and a measuring system for using the cable. The cable comprises a central conductor for current supply to an object to be measured, a voltage detection conductor insulated and located close to the central conductor, a tubular guarding conductor surrounding the above two conductors covered by insulating material and a tubular conductor for a reference potential surrounding the above-mentioned conductors (as covered by an insulating material).
Claims4
A measuring cable comprising,
- (a) a first conductor wire extending a predetermined length,
- (b) a first insulating material for covering said first conductor wire,
- (c) a second conductor wire disposed on said first insulating material and extending together with said first conductor wire,
- (d) a second insulating material for covering said first insulating material and said second conductor wire and extending together with said second conductor wire,
- (e) a third conductor sheath covering said second insulating material and extending together with said second insulating material, and
- (f) a fourth conductor sheath covering a third insulating material positioned about said third conductor sheath and extending together with said third conductor,
- said second conductor wire having a sufficiently small cross section so as not to substantially change a static capacitance between said first conductor wire and said third conductor sheath.
4 more elements
A measuring system comprising:
- a measuring cable including a first conductor wire, a first insulating material covering said first conductor wire, a second conductor wire disposed on said first insulating material, a second insulating material for covering said first insulating material and said second conductor wire, a third conductor sheath covering said second insulating material, and a fourth conductor sheath covering a third insulating material positioned about said third conductor sheath, said second conductor wire having a sufficiently small cross section so as not to substantially change static capacitance between said first conductor wire and said third conductor sheath;
- connecting means at one end of said measuring cable for connecting said first conductor wire and said second conductor wire to an electrode of an element to be measured;
- and
- a voltage/current characteristic measuring unit connected to another end of said measuring cable, for supplying said first conductor wire with a measurement current, detecting a potential on said second conductor wire, and for driving said third conductor sheath so that a potential of said third conductor sheath is substantially equal to the detected potential.
1 more element
Dependencies are inferred from the claim text.