#Cathode ray oscilloscope in hindi generator#

Frequency of signal with CRO can be determined by operation it in X-Y mode.Lissajous pattern may be used for accurate measurement of frequency.These patterns are called “Lissajous patterns”. It is interesting to consider the characteristics of pattern that appear on the screen of a CRT when sinusoidal voltages are simultaneously applied to horizontal and vertical deflection plates.

When dealing with sinusoidal voltages, the rms value is given by dividing the peak to peak voltage by 2 √2.

The length of this line corresponds to peak to peak voltage.

Direct voltages may be obtained from the static deflection of the spot, alternating voltages from the length of the line produced when the voltage is applied to Y-plates while no voltage is applied to X-plates.

The value of a current can be obtained by measuring the voltage drop across a known resistance connected in the circuit.

The electrostatic deflection given in equation shows that the deflection is proportional to the deflection-plate voltage.For the display of a waveform, horizontal plates are given a saw tooth wave which results into continuous motion electron beam from left to right on the screen.

#Cathode ray oscilloscope in hindi generator#

In normal mode of CRO, horizontal plates are connected to output signal of sweep generator which is inside the CRO.These plates are responsible for horizontal motion of electron beam.Horizontal deflecting plates or X-plates: These plates are supplied with external signal fed via one of the input channel of CRO.It is responsible for vertical deflection of electron beam.From figure we observe that the electron beam, after leaving the electron gun passes through two pairs of deflection plates.The electron beam is focusing an electron beam.The pre-accelerating anode and the accelerating anode are connected to a common positive high voltage of 1500 V.The electrons, emitted from the cathode and passing through the hole in the control grid are accelerated by the high positive potential which is applied to the pre-accelerating and accelerating anode.The grid with its negative bias controls the number of electrons emitted from the cathode and hence the intensity of electron beam is controlled by the grid.This control grid is usually a nickel cylinder, with a centrally located hole, coaxial with the CRT axis.The control grid is used to control the number of electron emitted from cathode.It is cylindrical shaped with layer of barium and strontium oxide is deposited on the end of the cathode which is to obtain high emission of electrons at moderate temperatures.

Heating element used to heat up the cathode.

The electron gun which emits electrons and forms them into a beam consists of several elements which are given below.

The source of focused and accelerated electron beam is the electron gun.

The main parts of a CRTs are following :.

The “Heart of the CRO” is the CRT, which generates the electron beam, accelerates the beam to a high velocity, deflects the beam to create the image and contains the phosphor screen where the electron beam eventually becomes visible.

The cathode ray oscilloscope (CRO) is a very useful and versatile laboratory instrument used for display, measurement and analysis of waveforms and other phenomena in electrical and electronics circuits.

to be displayed primarily as a function of time.

The CRO is a device that allows the amplitude of electrical signals, whether they be voltages, current, power etc.