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accuracy limits ammeter amperes amplifier analog computer angular applied average value balance equations basic block diagram bridge arms capacitor CDRX components connected constant control system critically damped current coil current sensitivity deflection detector determine device differential equation diodes electrical measurements electrodynamometer electronic equal equivalent circuit error example frequency full-scale galvanometer half-rectified impedance bridge input impedance input signal instru internal resistance let us assume Lissajous figure load magnetic field magnitude maximum ment meter milliammeter millivolts motor moving-iron instruments necessary obtain ohmmeter ohms open-circuit voltage output parameters percent phase angle PMMC instrument position potential coil potential-coil potentiometer problem quantities range ratio read the rms rectifier resistance scale result rms value series ohmmeter shown in Fig shows shunt sine wave sinusoidal slider standard cell temperature terminals Thevenin resistance tion torque transfer function underdamped usually variable voltmeter volts wattmeter watts Wheatstone bridge zero