Applications of PMMC Instruments
The PMMC system can be converted into an instrument to measure the A.C as well as D.C quantities like current, voltage and resistance.
- It is used to detect small currents in DC galvanometers.
- It is used in ammeter.
- It is used in voltmeter.
- It is used in ohmmeter.
- It is used in galvanometer.
- It is used to measure the change in magnetic flux linkage in galvanometer.
PMMC can be used for various measurement application to measure various quantities by adding additional components in the circuit of PMMC.
The various modifications of PMMC meter movement are,
D.C. instruments
- D.C ammeter – By using a Shunt resistor.
- D.C Voltmeter – By using series multiplier resistor.
- Ohm meter – By using battery and series resistor.
A.C. instruments
- A.F ammeter (or) Voltmeter – By using rectifier
- R.F ammeter (or) Voltmeter – By using a thermocouple
PMMC
A PMMC is also known as a D’arsonval meter which is used to measure current through a coil when the angular deflection takes place in the coil. It is accurate for DC measurement of current and voltage. Since they are polarity-sensitive, they are used to measure DC currents only. By adding some additional components to the PMMC, It can be used for other applications like ohm meter, ammeter, etc. At the end of this article, you will get a good understanding of PMMC instruments.
Table of Content
- What is PMMC?
- Working
- Construction
- Function of Central Core
- Types of Errors in PMMC
- Applications
- Characteristics
- Advantages of PMMC
- Disadvantages of PMMC