ARYTON SHUNT (OR) UNIVERSAL SHUNT

The Aryton shunt eliminates the possibility the likelihood of getting the meter within the circuit while not a shunt. This advantage is gained at the value of slightly higher overall resistance.

Figure shows a circuit an Aryton shunt ammeter.

                                                           Figure shows Aryton shunt

In this is circuit, once the switch is in position “I₁”, resistance R₁ is a in parallel with the series mixtures of R₂, R₃, and therefore the meter movement. Hence the current through the shunt is more than the current through the meter movement and reducing its sensitivity.

If the switch is connected to position “I₂”, resistance R₁ and R₂ square measure along in parallel with the series mixtures of R₃ and therefore the meter movement. Currently this through the meter is over this through the shunt resistance.

If the switch is connected in position ‘I₃’ R₁ ,R₂ , and R₃ square measure along in parallel with the meter. Therefore most current flows through the meter movement and extremely very little through the shunt. This will increases the sensitivity.

The following precautions should be observed when using an ammeter for measurement.

1. Never connect an ammeter across a supply of ‘EMF’. Because of its low resistance it would draw a high current and destroy the movement. Always  connect an ammeter in series with a load capable of limiting the current.

2. Observe the proper polarity, Reverse polarity causes the meter to deflect against the mechanical stopper, which can harm the pointer.

3. When using a multi range meter, first use the highest current range, then decrease the current range until substantial deflection is obtained. To extend the accuracy use the vary which will provides a reading as never full scale as possible.