Construction- A megger is a portable device which is used for the measurement of high resistance. The component of megger are Permanent magnet C shaft Hand driven generator Resistances RC and RD Two Coils- Control coil (Cs) Deflection Coil (Cd) Working Principle- As current provided by the hand driven generator Read more…
In the figure let us assume the voltmeter to be ideal (internal resistance Rin=infinite). So current Iv=0A I= IA+IV I=IA [IV=0A] V=VA+VK V=I×RA+I×Runknown Ammeter is not ideal here. V=I(RA+ Runknown) V/I= RA+ Runknown [V/I= Measured value of resistance] RM=RA+ Runknown So the measured value of resistance is greater than the Read more…
Measurement of resistance- Properties of resistance plays an important role in determining performance specification for various circuit elements including coil, winding, insulation etc. Apart from this resistor are use as standard for measurement of other unknown resistances and for the determination of unknown inductance and capacitance. For the point of Read more…