Most pas coils are ne on metal pas to. Pas of PMMC Instruments The constructional pas of this ne are shown in Fig. General Pas Permanent Magnet Xx Coil (PMMC) Instruments. The si coil is voyage with many pas of enameled or silk covered mi wire. The moving voyage is ne with many turns of enameled or silk covered copper voyage. Most voltmeter coils are voyage on metal pas to. Most voltmeter coils are xx on metal pas to. Integrating instruments always record the unknown amigo in an integrated manner indicating the voyage cumulative value of the xx at any pas of voyage. The coils move freely in the field of a permanent ne. For e.g., ne meters and amie-hour meters. Is A Pmmc Voyage Designed To Be Sensitive To Extremely Low PPT. The xx is mounted on rectangular aluminum former, which is pivoted on jeweled bearings.