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US 7,746,051 B1Granted
Voltmeter with dual displays
AssigneeHD Electric Company
InventorsJames S. Buchanan, William J. McNulty
Life of this patent
Estimating the term…
Abstract
A voltmeter/phaser includes dual hot-stick probes, each carrying a housing including a digital display, one of the housings also having a measurement circuit for measuring the sensed voltage. A plural-conductor cable interconnects the housings and carries, in two separate conductors, current between the probes and display data between the display circuits, so that identical voltage values are always displayed on the two displays.
Claims19
A voltmeter/phaser comprising:
- first and second probes for respectively accessing spaced-apart points in a circuit,
- a voltage measurement circuit proximate to the first probe,
- a cable including a first conductor connecting the first and second probes to each other and to the measurement circuit, and
- first and second voltage display circuits respectively disposed with the first and second probes,
- the first display circuit being connected directly to the measurement circuit,
- the cable including a second conductor connected between the voltage display circuits for conducting a display data signal from the first display circuit to the second display circuit, wherein the measurement circuit is the only measurement circuit to ensure that both display circuits display the same voltage value.
3 more elements
A voltmeter/phaser comprising:
- first and second high-voltage probes for respectively accessing spaced-apart points in a high-voltage circuit,
- a high-voltage measurement circuit proximate to one of the probes,
- a cable connecting the first and second probes to each other and to the measurement circuit, and
- first and second high-voltage display circuits respectively disposed with the first and second probes and coupled to the measurement circuit, wherein the measurement circuit is the only measurement circuit, and the first and second display circuits present identical voltage measures.
1 more element
A method of measuring and displaying a voltage between spaced-apart points in a circuit comprising:
- electrically contacting the points respectively with first and second probes,
- providing a plural-conductor cable between first and second the probes,
- conducting a current between the first and second probes through a first conductor of the cable, measuring the voltage at one of the probes
- measuring the current and displaying an equivalent measured voltage value at a first display disposed with the first probe, and
- conducting through a second conductor of the cable a signal representative of the displayed voltage value to a second remote display at the second probe so that both displays show the same value.
2 more elements
Dependencies are inferred from the claim text.