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Apparatus and method for detecting energy, such as power, consumed by a load. The apparatus preferably takes the form of a housing of sufficiently small size to be mounted in a motor control panel of a machine tool. The apparatus includes a digital processor adapted to enable bidirectional communica

Apparatus and method for detecting energy, such as power, consumed by a load. The apparatus preferably takes the form of a housing of sufficiently small size to be mounted in a motor control panel of a machine tool. The apparatus includes a digital processor adapted to enable bidirectional communication between the device and an external computer such as a host computer or machine controller. The processor is also used to perform various calibration functions.

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Apparatus for measuring energy used by an electrical load, said apparatus comprising: analog circuit means for providing electrical analog signals related to the energy used by the load, said analog circuit means including: a first multiplexer having a plurality of inputs and an output, a first inpu

Apparatus for measuring energy used by an electrical load, said apparatus comprising: analog circuit means for providing electrical analog signals related to the energy used by the load, said analog circuit means including: a first multiplexer having a plurality of inputs and an output, a first input being coupled to the load, a second input being coupled to a source of positive reference voltage, a third input being connection to a source of negative reference voltage, and a fourth input being connected to a substantially zero voltage source; second multiplexer means having a plurality of inputs and an output, a first input being connected to the laod, a second input being connected to a source of positive reference voltage, a third input being connected to a source of negative reference voltage, and a fourth input being connected to a substantially zero reference voltage source; and a multiplier having first and second inputs and an output, the first input of the multiplier being connected to the output of the first multiplexer, with the second input of the multiplier being connected to the output of the second multiplexer; analog to digital converter means coupled to the output of the multiplier for converting said analog signal to a digital representation thereof; digital processor means coupled for receipt of the digital representation from the converter means, said processor serving to select which inputs of the multiplexers are coupled to the outputs thereof, said processor in one mode of operation causing the first inputs of the first and second multiplexers to be coupled to the outputs thereof whereby the digital representation from the converter means is related to energy consumed by the load, with said processor means periodically selecting the second, third and fourth inputs of the first and second multiplexers in a predetermined sequence in a calibration mode of operation; and bidirectional communication means coupled to the digital processor means for providing two way communication between the processor and an external computer.