Compact taut band meter movement assembly

A taut band meter movement assembly for indicating a measured value on a scale display, the assembly comprising:

• a magnet;
• a movement coil having first and second ends defining an axis about which said movement coil rotates;
• first and second spring members having first and second ligament wire holding arms, respectively, and having first and second ring engaging members, respectively;
• a ligament wire held by said first and second holding ligament wire holding arms;
• a one piece molded movement frame having first and second side members having opposing inner surfaces thereon, said first and second side members holding and centering said magnet between said opposing inner surfaces, said first and second side members including opposing projections, opposing slot engaging edges, and opposing flat regions on said opposing inner surfaces, said magnet including slots to receive said opposing slot engaging edges to snap into position between said opposing projections and said opposing flat regions of said first and second side members, said movement frame including first and second pairs of circular flat discs for mounting said first and second spring members, respectively, on said movement frame in the region of said first and second ends, respectively, of said movement coil, said first and second pairs of circular flat discs being separated to create first and second spring receiving slots, respectively, said first spring receiving slot receiving said first ring engaging member of said first spring member and said second spring receiving slot receiving said second ring engaging member of said second spring member, said first and second spring receiving slots being formed so that when said first and second spring members are rotated 90.degree., said spring members are placed in locked positions on said movement frame, said first and second spring members supporting said movement coil at said first and second ends, respectively, said ligament wire attaching to said first and second ligament wire holding arms of said first and second spring members, respectively, for allowing rotation of said movement coil about said magnet between said magnet and said movement frame;
• a dial needle attached to said movement coil for movement with said coil for indicating said measured value of said meter assembly on said scale display,
• a magnet ring for receiving, surrounding and attaching to said movement frame without any additional attachment elements but permitting movement of said movement coil, and for protecting said movement assembly from physical damage and for shielding said magnet from magnetic influences outside of said magnet ring.

An electrical meter for measuring electrical quantities of a device under test and displaying a measured value on a scale display, said meter having a taut band meter movement assembly, said assembly comprising:

• a magnet;
• a movement coil having first and second ends defining an axis which said movement coil rotates about;
• first and second hook-up wires for electrically connecting to said device under test;
• first and second spring members having first and second ligament wire holding arms, respectively, and first and second extensions for providing an electrical connection between said first and second hook-up wires and said first and second spring members, respectively;
• a ligament wire held by said first and second ligament wire holding arms;
• a one piece movement frame including means for holding and centering said magnet without any additional attachment elements, including means for holding and centering said spring members on said frame in the region of said first and second ends of said movement coil without any additional attachment elements, said first and second spring members supporting said movement coil via said ligament wire for allowing rotation around said magnet between said magnet and said movement frame;
• a dial needle attached to said movement coil for movement with said coil for indicating a measured electrical value on a scale display from said device under test;
• a magnet ring for surrounding and attachment to said movement frame without any additional attachment elements and for protecting said movement assembly from external forces and for shielding said magnet from any magnetic influences outside of said magnet ring.