BALANCING MEANS FOR MOVING COILS OF ELECTRICAL MEASURING INSTRUMENTS

摘要

A fully assembled moving coil assembly for use in D'Arsonval and like electrical measuring instruments includes a disk-shaped plastic balancing element which is integral with the pointer and with a portion of one of the bearing members and is formed with one or more annuli of equidistant bores for reception of pin-shaped counterweights. The center of each annulus is located on the pivot axis of the moving coil assembly. One or more counterweights are inserted into and snugly received in selected bores after the assembly is tested in a suitable apparatus which determines the location of the unbalance.