Power load survey apparatus

Claim 1

A power load survey apparatus comprising: electronic power sensing means for multiplying a signal proportional to a load voltage by a signal proportional to a load current, and producing a multiplication signal indicative thereof and for converting said multiplication signal to a pulse signal which is then outputted as a power load amount; collector cartridge means, detachably coupled to said electronic power sensing means, for receiving said pulse signal from said electronic power sensing means when said collector cartridge means is coupled thereto, said collector cartridge means having: (a) a counter having an ID number setting circuit for outputting an ID number signal and for counting said pulse signals indicative of said power load amount when said collector cartridge means is coupled to said electronic power sensing means to produce an output signal indicative thereof, (b) memory means, coupled to said counter for storing said output from said counter, (c) a time keeping circuit coupled to said memory means for causing time data to be stored in said memory means at intervals of a determined length, and (d) power source means for supplying a supply voltage to said collector cartridge means, said collector cartridge means being an interchangeable unit; and memory and magnetic tape converting means, detachably coupled to said collector cartridge means, and including (a) a magnetic tape device for transferring thereto and recording therein data stored in said collector cartridge means when said memory and magnetic tape converting means is coupled to said collector cartridge means, (b) a standard clock keeping a standard time, and (c) time rectification means for applying said standard time of said standard clock to said time keeping circuit of said collector cartridge means when said memory and magnetic tape means is coupled to said collector cartridge means to thereby cause said time keeping circuit to be time rectified to said standard time; wherein said collector cartridge means further includes (e) converting means for coupling to said memory and magnetic tape converting means to receive said time data from said standard clock and for applying said time data to said time keeping circuit.