6. (10%) A series ohmmeter that has a standard internal resistance of R₁-50 kQ uses a PMMC with FSD=75μA and Rm=100 2. The battery voltage is EB-5V. If the accuracy of the adopted PMMC is ±2% of full scale deflection, please calculate the accuracy of resistance measurement for the series ohmmeter at 0.25 FSD, 0.5 FSD and 0.75FSD.