8 April 2020

Advantages and disadvantages of Galvanometer

A Galvanometer is one type of ammeter. A galvanometer is an instrument for detecting and also a measuring electric current. The Galvanometer is the device that is used for measuring the magnitude of the device or detecting the presence of a small voltage(V) and current(I). The Galvanometer is mainly used in the potentiometer and bridges where they indicate the zero current or called the null deflection. Here this article gives information about the advantages and disadvantages of Galvanometer to better understand this topic.

Advantages of galvanometer:
  • It will not affect by a strong or big magnetic field.
  • It is accurate and reliable.
  • Scales of this is uniform.
Disadvantages of galvanometer:
  • Overload can spoil and kind of galvanometer.
  • We can not change the restoring torque easily.
  • The temperature change will cause a change within restoring torque.
  • These cannot be used for AC quantities measurement.
This article also gives information about moving coil Galvanometer to better understand this topic.

Advantages and disadvantages of a moving coil galvanometer:

Advantages of moving coil galvanometer:
  • High accuracy and reliability
  • The torque to weight ratio is high.
  • High sensitivity.
  • Their scale is uniform.
  • Not easily affected stray magnetic fields.
Disadvantages of moving coil galvanometer:
  • It can be used only to measure direct currents.
  • Develops errors due to factors like aging of the instruments, permanent magnets and damage of spring due to mechanical stress.
  • The change in temperature causes a change in restoring torque.
  • Restoring torque can not be easily changed.
  • Such an instrument can be used only measurement direct current quantity and can not be used for measurement of alternating current quantities.
  • There are possibilities of damage to phosphor bronze fiber or helical restoring spring due to severe stress.