What letter is used to indicate the frequency?

Frequency is often expressed by the symbol F or V. In order to commemorate the contribution of German physicist Hertz, the unit of frequency is named Hertz, abbreviated as "Hertz", and the symbol is Hertz.

Frequency refers to the number of times a substance completes periodic changes in 1s, and is a quantity describing the frequency of periodic motion, which is expressed as f = 1/t by a formula.

Every object has a frequency independent of amplitude, which is determined by the nature of the object itself and is called the natural frequency. The concept of frequency is not only used in mechanics and acoustics, but also in electromagnetism, optics and radio technology.

Extended data:

Method for measuring frequency:

1, passive frequency measurement method (can be divided into resonance method and bridge method)

It is often used for coarse frequency measurement with an accuracy of about 65438 0%.

2, active comparison method (can be divided into beat frequency method and difference frequency method)

Beat frequency method is to use the linear superposition of two signals to produce beat frequency phenomenon, and then measure the frequency by detecting zero beat phenomenon, which is often used for low-frequency measurement with an error of several tenths of hertz.

The difference frequency method is to use the superposition of two nonlinear signals to produce the difference frequency phenomenon, and then measure the frequency by detecting the zero difference phenomenon, which is often used in high-frequency measurement, and the error is about 20Hz.

3. Electronic counting method

Electronic counting method is mainly controlled by single chip microcomputer. Due to the powerful control and operation function of single chip microcomputer, electronic counting method has wide measuring frequency range, high precision and easy implementation, but there are some shortcomings in measuring range and precision.

Baidu Encyclopedia-Frequency