A moving coil instrument is a type of electrical measuring instrument that uses a coil of wire to measure current or voltage. The coil moves in response to the flow of electricity, and this movement is then measured and converted into a reading on a scale.
A moving coil instrument works by using the principle of electromagnetic induction. When an electric current flows through the coil of wire, it creates a magnetic field. This magnetic field interacts with the magnetic field of a permanent magnet, causing the coil to move. The movement of the coil is then translated into a measurement on a scale.
One of the main advantages of using a moving coil instrument is its high accuracy. The movement of the coil is directly proportional to the current or voltage being measured, which results in precise readings. Additionally, moving coil instruments are also durable and have a longer lifespan compared to other types of measuring instruments.
There are two main types of moving coil instruments: ammeters and voltmeters. Ammeters measure the flow of electric current, while voltmeters measure the potential difference between two points in an electrical circuit. There are also specialized moving coil instruments, such as galvanometers, which are used to measure small currents.
To calibrate a moving coil instrument, you will need a known source of current or voltage. You can then adjust the instrument's scale so that the reading matches the known value. It is important to regularly calibrate moving coil instruments to ensure accurate readings.