How can you make a multi range voltmeter?
A multi-range voltmeter can be constructed by using a galvanometer circuit as shown in the figure. We want to construct a voltmeter that can measure 2V , 20V and 200V using a galvanometer of resistance 10Ω and that produces maximum deflection for current of 1 mA . Find the value of R1 , R2 and R3 that have to be used.
What is multi range voltmeter?
The moving coil multi-range voltmeter can be used to measure A.C. as well as D.C. voltages. The operation of these meters depend on the interaction between the field of permanent magnet and moving coil field. To measure the voltage, select the desired voltage range and toggle the switch to choose between A.C and D.C.
How is a voltmeter designed?
A voltmeter is placed in parallel with a circuit element to measure the voltage drop across it and must be designed to draw very little current from the circuit so that it does not appreciably change the circuit it is measuring. To accomplish this, a large resistor is placed in series with the galvanometer.
What is a Wattmeter used for?
The wattmeter is an instrument for measuring the electric active power (or the average of the rate of flow of electrical energy) in watts of any given circuit. Electromagnetic wattmeters are used for measurement of utility frequency and audio frequency power; other types are required for radio frequency measurements.
What is Multirange meter?
The basic idea of a multirange ammeter is to make the meter usable over a wide range of voltages. In order to accomplish this, each range must utilize a different shunt resistance. The example give in this text is that of a two-range meter.
What is multi range?
Definition of multirange : operating or effective across more than one range (such as vocal or frequency ranges) a multirange voice multirange radio.
What are multi range instruments?
A multiple range scale (weighing instrument) is defined as a weighing instrument having two or more weighing ranges with different maximum capacities and different scale intervals for the same load receptor, each range extending from zero to its maximum capacity.
What components make up a commercial voltage meter?
PARTS AND MATERIALS
- Multimeter, digital or analog.
- Assorted batteries.
- One light-emitting diode (Radio Shack catalog # 276-026 or equivalent)
- Small “hobby” motor, permanent-magnet type (Radio Shack catalog # 273-223 or equivalent)
How does D arsonval meter work?
In the d’Arsonval meter movement, current through the coil causes the coil to move in the magnetic field of the permanent magnet. This movement of the coil (conductor) through a magnetic field causes a current to be induced in the coil opposite to the current that caused the movement of the coil.
How do you change the range on a voltmeter?
The range of voltmeter can be increased by connecting a suitable high resistors in series with it. 2. The range of a voltmeter can decreased by reducing its resistace. This can be done by putting a suitable resistance in parallel with the voltmeter.
How do you make a simple voltmeter?
To make this you are going to need:
- A cardboard of 7.5 * 7 inches.
- A small but powerful magnet.
- Magnet wire, the thinner the better.
- A cardboard piece of 7 * 0.5 inches or a straw. Straw works better.
- Scissors.
- A pin.
- A paper clip or something similar.
- some more scrap cardboards.