Frequency of alternating current Measuring the frequency

Frequency of alternating current

Measuring the frequency of the alternating current The frequency of the AC measure of the frequency. There are two kinds of such devices • Electromagnetic devices • Ferrodinamicheskie devices

Electromagnetic resonant frequency Has an electromagnetic field which is located a steel armature and connected with a steel bar. This bar is mounted on an elastic spring and placed him on a number of flexible steel plates

Ferrodinamichesky frequency Is a ratio-meter ferrodinamicheskoy system. The coils are connected in ratiometer two parallel chains which are connected to two points between which the operating voltage of alternating current (as well as voltmeters).

Direct measurement of the frequencies produce the frequency, which are based on different methods of measurement depending on the range of measured frequencies and the required accuracy. The most common methods of measurement of frequency are:

Ø The method of recharging the capacitor for each period, the measured frequency. Average current is proportional to the frequency of recharging, and is measured magnetoelectric ammeter, the scale is scaled in units of frequency. ü A resonant method based on the phenomenon of electrical resonance in the circuit with adjustable elements in response to the measured frequency. The measured frequency is determined by the scale of the mechanism of adjustment.

Another way of measuring the frequency comparison method - using an oscilloscope, which has a duration calibrated scan or built-in generator of calibrated marks.

The method of digital computers is at the heart of the digital frequency. It is based on analysis of the measured frequency pulses for a certain period of time. Provides high accuracy in any frequency band.

Presentation on a theme the Frequency of alternating current prepared by student 2 courses of a speciality 160901 Shelkov Nikita