Electrical Engineering ⇒ Topic : Extension of Range of PMMC Instruments
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Extension of Range of PMMC Instruments In a permanent-magnet moving coil (PMMC) instrument, the moving coil and the springs used as coil connections have a very delicate design and can carry maximum cun-ent of about 10 mA i.e.,full-scale deflection (f.s.d.) will occur when about 10 mA current flows through the instrument coil.If current through the coil exceeds this value (i.e. 10 mA), the coil may be burnt due to excessive heat. However, in practice, we have to measure large currents and voltages. In such situations, some means are adopted to increase the range of the instruments | |
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