CLAMP-ON MULTIMETERS INCLUDING A ROGOWSKI COIL FOR MEASURING ALTERNATING CURRENT IN A CONDUCTOR
First Claim
1. A clamp-on multimeter for measuring alternating current flow in an electrical conductor of an electrical circuit, comprising:
- a digital display configured to show a measurement of the alternating current flow in the electrical conductor;
a housing including the digital display;
a first sensor having a magnetizable material core configured to inductively sense the alternating current without breaking the electrical circuit, the first sensor includes a first clamp portion fixedly coupled to the housing and a second clamp portion pivotally coupled to the first clamp portion, wherein the electrical conductor passes through a gap between the first and second clamp portions in an open arrangement of the first sensor and the first and second clamp portions surround the electrical conductor in a closed arrangement of the first sensor;
a second sensor including a Rogowski coil having a non-magnetic core and configured to inductively sense the alternating current without breaking the electrical circuit;
a processor disposed in the housing and configured to receive an input signal in a first voltage range and to send an output signal to the digital display; and
an integrator disposed in the housing and configured to scale a signal from the second sensor in a second voltage range to the first voltage range;
wherein the housing includes the processor, the integrator, and a selector configured to select the input signal to the processor from one of (a) the first sensor and (b) the integrator.
1 Assignment
0 Petitions
Accused Products
Abstract
A clamp-on multimeter measures alternating current flow in an electrical conductor. The multimeter includes a display, a housing including the display, a first sensor, a second sensor, a processor and an integrator. The first sensor has a magnetizable material core and inductively senses the alternating current. The first sensor includes a first clamp portion fixed to the housing and a second clamp portion pivotally coupled to the first clamp portion. The second sensor includes a Rogowski coil that has a non-magnetic core and inductively senses the alternating current. The processor receives an input signal in a first voltage range and sends an output signal to the digital display. The integrator scales a signal from the second sensor in a second voltage range to the first voltage range. The housing includes the processor, the integrator, and a selector configured to select the input signal to the processor from one of the first sensor and the integrator.
22 Citations
19 Claims
-
1. A clamp-on multimeter for measuring alternating current flow in an electrical conductor of an electrical circuit, comprising:
-
a digital display configured to show a measurement of the alternating current flow in the electrical conductor; a housing including the digital display; a first sensor having a magnetizable material core configured to inductively sense the alternating current without breaking the electrical circuit, the first sensor includes a first clamp portion fixedly coupled to the housing and a second clamp portion pivotally coupled to the first clamp portion, wherein the electrical conductor passes through a gap between the first and second clamp portions in an open arrangement of the first sensor and the first and second clamp portions surround the electrical conductor in a closed arrangement of the first sensor; a second sensor including a Rogowski coil having a non-magnetic core and configured to inductively sense the alternating current without breaking the electrical circuit; a processor disposed in the housing and configured to receive an input signal in a first voltage range and to send an output signal to the digital display; and an integrator disposed in the housing and configured to scale a signal from the second sensor in a second voltage range to the first voltage range; wherein the housing includes the processor, the integrator, and a selector configured to select the input signal to the processor from one of (a) the first sensor and (b) the integrator. - View Dependent Claims (2)
-
-
3. A clamp-on multimeter for measuring alternating current flow in an electrical conductor of an electrical circuit, comprising:
-
a digital display configured to show a measurement of the alternating current flow in the electrical conductor; a housing including the digital display; a first sensor having a magnetizable material core configured to inductively sense the alternating current without breaking the electrical circuit, the first sensor includes a first clamp portion fixedly coupled to the housing and a second clamp portion pivotally coupled to the first clamp portion, wherein the electrical conductor passes through a gap between the first and second clamp portions in an open arrangement of the first sensor and the first and second clamp portions surround the electrical conductor in a closed arrangement of the first sensor; a processor disposed in the housing and configured to receive an input signal in a first voltage range and to send an output signal to the digital display; and a port configured to electrically couple to a Rogowski coil with the processor; wherein the housing includes the processor, the port, and a selector configured to select the input signal to the processor from one of (a) the first sensor and (b) the port. - View Dependent Claims (4)
-
-
5. A multimeter for measuring alternating current flow in an electrical conductor of an electrical circuit, comprising:
-
a first sensor configured to inductively sense the alternating current without breaking the electrical circuit, wherein the first sensor has a magnetizable material core; and a second sensor configured to inductively sense the alternating current without breaking the electrical circuit, wherein the second sensor has a non-magnetic core. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. A kit for measuring alternating current flow in an electrical conductor of an electrical circuit, comprising:
-
a multimeter including— a digital display configured to show a measurement of the alternating current flow in the electrical conductor; a clamp having a magnetizable material core configured to inductively sense the alternating current without breaking the electrical circuit and to produce a first signal in a first voltage range corresponding to the alternating current, the clamp includes a first clamp portion and a second clamp portion pivotally coupled to the first clamp portion, wherein the electrical conductor passes through a gap between the first and second clamp portions in an open arrangement of the clamp and the first and second clamp portions surround the electrical conductor in a closed arrangement of the clamp; a processor configured to receive an input signal in the first voltage range and to send an output signal to the digital display; and an integrator configured to scale a second signal in a second voltage range to the first voltage range; wherein the housing includes the display, the processor, the integrator, and a port configured to receive the second signal; and a Rogowski coil having a non-magnetic core and configured to inductively sense the alternating current without breaking the electrical circuit and to produce the second signal in the second voltage range corresponding to the alternating current. - View Dependent Claims (18, 19)
-
Specification