An autonomous device for study of parameters of mode of electric networks comprises resistive voltage dividers and specialized microcircuits of amplifier with galvanic uncoupling for measurement of voltage of each network phase, outputs of those are connected to inputs of matching blocks outputs of which are connected to inputs of the block of analog-to-digital converter other inputs of which are connected to the outputs of the block of current signal matching inputs of which are connected to outputs of clamp-on ammeter, the inputs of the last ones are connected by magnetic circuit to phase wires of the network. Inputs of converters of direct voltage to direct voltage with galvanic uncoupling are connected to autonomous power supply block. The output of the block of analog-to-digital converter through USB 1.1-port is connected to a computer that has autonomous power supply.
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