Clamp type galvanometer

Claim 1

A clamp type galvanometer, comprising: (a) current transformer means (5) including a core assembly of laminated plates made of an alloy of about 78.5% nickel and about 21.5% iron, said core assembly being split to provide two half core segments (8), said segments being pivotally secured at one end and overlapping each other at the other end, a portion of each plate where a coil is to be wound being reduced in width; (b) a coil (9) wound around each segment at such reduced width portion; (c) a shield plate (10) disposed over each coil; (d) a lever (14) for opening or closing the overlapping other end of said segments; (e) a case wherein said one end of said segments are pivotally secured, said case being of a size carriable with one hand, said lever extending out of said case; (f) a meter assembly (19) with a pointer and graduations for indicating the output of said current transformer means displayed on said case, and including first circuit means with current measuring means operatively coupled to said current transformer means (5) to indicate the output of said current transformer means with said pointer and graduations; (g) a printed circuit (25) having shunt circuit means in said meter assembly for measuring various ranges of current; (h) a circular switching knob (27) coupled to said shunt circuit means for operating said printed circuit so as to determine the measuring range being measured; and, (i) a lock bar (29) disposed for being in contact with or separate from said pointer with a second knob (33) for operating said lock bar, said second knob being at the side of the case.