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Electrical Engineering (EE) Exam  >  Electrical Engineering (EE) Questions  >  Working principle of Weston type frequency me... Start Learning for Free
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Working principle of Weston type frequency meter is based on which of the following principles?
  • a)
    Deflection
  • b)
    Speed
  • c)
    Light
  • d)
    Reflection
Correct answer is option 'A'. Can you explain this answer?
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Working principle of Weston type frequency meter is based on which of ...
Working Principle of Weston Type Frequency Meter
Frequency meters are used to measure the frequency of an alternating current (AC) signal. The Weston type frequency meter operates based on the principle of deflection.

Deflection
- In a Weston frequency meter, a moving coil is suspended in a magnetic field.
- When an AC current flows through the coil, a magnetic field is produced around it.
- This magnetic field interacts with the stationary magnetic field, causing the coil to experience a force that results in deflection.
- The amount of deflection is proportional to the frequency of the AC signal passing through the coil.

How it works
- The deflection of the moving coil is measured by a pointer on a scale, calibrated to indicate the frequency of the AC signal.
- The scale is designed such that the deflection of the coil corresponds directly to the frequency being measured.
- By observing the position of the pointer on the scale, the frequency of the AC signal can be determined accurately.

Advantages of Weston Type Frequency Meter
- Weston frequency meters are known for their accuracy and reliability in measuring frequency.
- They are widely used in various applications where precise frequency measurement is required, such as power systems, telecommunications, and industrial processes.
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Working principle of Weston type frequency meter is based on which of ...
Weston Type Frequency Meter:
  • Weston type frequency meter is based on the principle of the deflection, where the unknown value of the frequency of an input signal can be determined using this meter.
  • It consists of 2 coils inductive coil and resistive coil, which are the right angle to one another.
  • The 2 pairs, resistor RA, and coil A and inductor LA and coil B pair are placed in series, other pairs, LA and coil A, and RB, and coil B are placed parallelly.
  • The meter consists of a soft pointer made up of iron and a magnetic needle which is placed at the center.
  • The inductor “L” connected is in series with “LA and RB ” minimizes the errors.
  • When the supply is given to the Weston frequency meter, the current starts flowing into the coil A and B.
  • The perpendicular magnetic field set up in the coils because of the current. The magnitude of the field depends on the current passes through the coils.
  • The magnetic field of both the coil A and coil B acts on the soft iron and the magnetic needle.
  • The position of the needle depends on the relative magnitude of the magnetic field acts on it.
  • The meter designs such a way that when the normal frequency passes through the coil then the voltage drops across the LA, LB, RA, and RB remains same.
  • Thus, same magnitude current passes through the coils. In this situation, the magnetic needle makes an angle of 45° concerning the coils and the soft iron needle places at the centre of the scale.
  • When the high frequency passes through the meter, the reactance LA and LB of the coil increases and the RA and RB remains same.
  • ​The inductance increase the impedance of the coil A. The impedance means the opposition offered by the circuit in the flow of current.
  • As the magnitude of current in the coil A decreases, the field develops because of the coil, A current also decreases.
  • The more current flows through the coil B because of the parallel connections with coil A.
  • ​The magnetic field develops in the coil B becomes stronger than the coil A.
  • The magnetic needles align themselves parallel to the axis of the strong magnetic field, and the pointer deflects towards the coil B or strong magnetic field.
  • Finally, the frequency which is to be determined reduces from its normal value, and the pointer indicates the value of unknown frequency towards the left side.
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Working principle of Weston type frequency meter is based on which of the following principles?a)Deflectionb)Speedc)Lightd)ReflectionCorrect answer is option 'A'. Can you explain this answer?
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