A method of determining whether an electrical appliance can tolerate variations in supplied electrical energy. In some embodiments, the method may include coupling the electrical appliance to a source of electrical energy, delivering electrical energy to the electrical appliance, wherein the electrical energy is delivered at a first electrical energy level, obtaining a first measurement of current consumed by the electrical appliance at the first electrical energy level, delivering electrical energy to the electrical appliance at a second electrical energy level different than the first electrical energy level, obtaining a second measurement of current consumed by the electrical appliance at the second electrical energy level, and comparing the first measurement of current to the second measurement of current.
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