A tachometer measures rotational speed by detecting voltage induced via electromagnetic induction from a rotating part, such as a shaft. There are two main types: DC tachometers detect continuous voltage whereas AC tachometers detect alternating voltage. A clamp meter measures electric current by clamping around a wire without disconnecting it. It detects magnetic fields to measure both AC and DC current.

1. TACHOMETER AND
CLAMPMETER
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Contents:
Definition
Types
working
Clamp meter
Working
References

2. Definition Tachometer
 The tachometer use for measuring the rotational speed or
angular velocity of the machine which is coupled to it. It works
on the principle of relative motion between the magnetic field
and shaft of the coupled device. The relative motion induces
the EMF in the coil which is placed between the constant
magnetic field of the permanent magnet. The develops EMF is
directly proportional to the speed of the shaft.
 The electrical tachometer converts the angular velocity into an
electrical voltage. The electrical tachometer has more
advantages over the mechanical tachometer. Thus it is mostly
used for measuring the rotational speed of the shaft. Depends
on the natures of the induced voltage the electrical tachometer
is categorized into two types.
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3. Types
 AC Tachometer Generator
 DC Tachometer Generator
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4. DC Tachometer Generator
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5. AC Tachometer Generator
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6. Drag Cup Rotor AC Generator
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7. Clamp Meter Principle
Measurement Principle of
AC/DC Clamp Meter
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8. How Do Clamp Meters Operate?
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9. Kongunadu College of Engineering and Technology
Reference:
 https://en.wikipedia.org/wiki/Tachometer
 https://www.youtube.com/watch?v=TzWbGhELqz4
 https://ieeexplore.ieee.org/document/8500229
 https://ieeexplore.ieee.org/document/7962292