26-04-2011, 02:50 PM
Presentation By
ROHIT KELUSKAR
ANALOG & DIGITAL INSTRUMENTS.pptx (Size: 1.03 MB / Downloads: 87)
ANALOG INSTRUMENTS
TYPES OF MEASURING INSTRUMENT
ANALOG INSTRUMENTS
PMMC INSTRUMENTS
WORKING PRINCIPAL OF PMMC INST.
The operation of a PMMC instrument is based on principal that when a current carrying conductor is placed in a Magnetic field , a force acts on the conductor, which tends to move it to one side
BLOCK DIA. OF ANALOG INSTRUMENTS
DC VOLTMETER
VALU OF SERIES MULTIPLAYER IS CALCULATED AS:-
Sensitivity Of analog Voltmeter
The sensitivity of analog voltmeter is reciprocal of full scale deflection current
A BASIC MOVEMENT CAN BE CONVERTED INTO A DC Ammeter By Connecting Parallel Resistor To The Movement Called As SHUNT
AMMETER
Valu Of Shunt is calculated :- Rsh = Ifsd x Rin
AC VOLTMETER
Normally ac voltmeters are average responding type and the meter is calibrated in terms of the rms values for a sine wave. Since most of the voltage measurements involve sinusoidal waveform so this method of measuring rms value of ac voltages works satisfactorily and is less expensive than true rms responding voltmeters. However, in case of measurement of non-sinusoidal waveform voltage, this meter will give high or low reading depending on the form factor of the waveform of the voltage to be measured.
ANALOG MULTIMETER
Analog multimeters are electrical test instruments which are used to measure voltage, current, resistance, frequency and signal power.