Granted Patent B2

US 12,461,152 · App. 17/426,533 · Granted Nov 4, 2025

Inventors: Bruce R. Kuhn (Naperville, IL); Christian A. Castro (Deerfield, IL)

Assignee: Klein Tools, Inc.

G01R31/3274

Abstract

Claims (29)

1 . An arc fault circuit interrupt (AFCI) tester device, comprising:

a housing;

a circuit assembly disposed within the housing and including:

a first load switching circuit for creating a pulse pattern having a plurality of pulses;

a second load switching circuit for creating an overlay signal superimposed upon at least one pulse of the plurality of pulses; and

an interface receiving the plurality of pulses and the overlay signal, the interface extending outside of the housing and adapted for electrically coupling the circuit assembly to an AFCI device under test (DUT), the interface adapted to transmit the pulse pattern and the overlay signal to the AFCI DUT;

wherein at least one pulse of the plurality of pulses has:

a pulse width that is less than a pulse width of at least one other pulse of the plurality of pulses; and

a pulse amplitude that is less than a pulse amplitude of the at least one other pulse.

2 . The AFCI tester device of claim 1 , further comprising logic circuitry coupled to the first and second load switching circuits of the circuit assembly, the logic circuitry being configured to:

transmit a first control signal to the first load switching circuit to facilitate creating the pulse pattern; and

transmit a second control signal to the second load switching circuit to facilitate creating the overlay signal.

3 . The AFCI tester device of claim 2 , wherein the logic circuitry is further configured to:

(a) transmit the first control signal to the first load switching circuit to facilitate at least one of:

creating the pulse pattern at one or more predetermined pulse frequencies;

creating the plurality of pulses at one or more predetermined pulse widths; and

creating the plurality of pulses at one or more predetermined pulse amplitudes; and

(b) transmit the second control signal to the second load switching circuit to facilitate at least one of:

creating the overlay signal at one or more predetermined signal frequencies; and

creating the overlay signal at one or more predetermined signal amplitudes.

4 . The AFCI tester device of claim 1 , wherein at least two pulses of the plurality of pulses have at least one of:

substantially equal pulse widths; and

substantially equal pulse amplitudes.

5 . The AFCI tester device of claim 1 , wherein the pulse pattern has a pulse frequency, and wherein the overlay signal has a signal frequency that is greater than the pulse frequency.

6 . The AFCI tester device of claim 1 , wherein the overlay signal is superimposed upon a first two or more pulses of the plurality of pulses, and the overlay signal is not superimposed upon a second two or more pulses of the plurality of pulses.

7 . The AFCI tester device of claim 1 , wherein the overlay signal induced by the second load switching circuit includes a first overlay signal and a second overlay signal, wherein the pulse pattern has a pulse frequency, and wherein at least one of:

a signal frequency of the first overlay signal, which is superimposed on one pulse of the plurality of pulses is less than a signal frequency of a second overlay signal, which is superimposed on another pulse of the plurality of pulses; and

a signal amplitude of the first overlay signal is less than a signal amplitude of the second overlay signal.

8 . The AFCI tester device of claim 1 , wherein the overlay signal is superimposed upon all pulses of the plurality of pulses.

Assignments (1)

Continuity (1)

References Cited (15)