Cathode ray oscilloscope ppt9/1/2023 ![]() ![]() It has an advantage over electro-mechanical measuring devices that it can respond very well Signal, time between two events, and relative timing of two related signals.Ĥ. Apart from amplitude measurement, it can measure frequency, phase angle, time delay of the Amplitude of signals like voltage, current, power etc., can be measured by the oscilloscope.ģ. Used to measure various electrical parameters.Ģ. It provides a graphical display of the amplitude of a signal as a function of time. Due to this feature, a fast signal can be graphically compared with a slow signal simultaneously on the CRO screen.Īdvantages of General Purpose Oscilloscopeġ. Hence, in dual beam CRO two input signals can be swept horizontally at different rates. It can also have two separate time base circuits (i.e. It has two separate vertical channels for two input signals.ĥ. ![]() Provided by a dual trace oscilloscope consists of small gaps in the trace.Ĥ. It also provides a continuous display of the signals, whereas the display of the two signals It can capture two fast transient events.ģ. Hence dual beam CRO is used to compare one signal with another signal.Ģ. A multiple trace oscilloscope making use of dual beam provides a simultaneous display of the two input waveforms on the CRO screen. Several output modes can be selected from front panel of CRO.Īdvantages of Dual Beam for Multiple Trace Oscilloscopesġ.In X-Y mode,the oscilloscope operates from channel A to vertical amplifier and the other vice versa.The horizontal amplifier can be fed from sweep generator or through channel B via switch S1.If channel B,it is called X-Y mode.From figure,the switch S2 allows the circuit to be triggered on either of the inputs A or B channel or on line frequency or an external signal.To 500kHz.In this mode,the switch connects small segments of A & B waveform to main amplifier at a fast chopping rate of 500kHz ie equal to 1microsecond sweep of each waveform is fed to CRT for display. This mode is used for higher frequencies,say of order 100kHz In this mode,the CRO spot traces channel A signal on one sweep & channel B on next.These signals have calibrated input attenuators and vertical position control and also amplitude of these signals can be adjusted individually and two images are placed separately on the screen. Two different input signals are used ie Channels A & B with attenuators and preamplifiers.A delay line is used between electronic switch & vertical amplifier that alternately connects the input to main vertical amplifiers.There are two common operating mode for electronic switch called as. ![]() The range of positive voltage supply is from 300V to 400V. The voltages of negative high voltage supply is from -1000V to -1500V. Power supply block of oscilloscope is classified in to two types The voltages require by CRT, horizontal amplifier and vertical amplifier are provided by the power supply block. Hence input signal and the sweep frequency can be synchronized. The signals which are used to activate the trigger circuit are converted to trigger pulses for the precision sweep operation whose amplitude is uniform. The saw tooth voltage produce by the time base circuit is amplified by the horizontal amplifier before it is applied to horizontal deflection plates. The spot is deflected by the saw tooth voltage at a constant time dependent rate. The saw tooth voltage produced by the time base circuit is required to deflect the beam in the horizontal section. ![]() Time base circuit uses a uni junction transistor, which is used to produce the sweep. Therefore, the input signal is delayed by a period of time. The input signal is not applied directly to the vertical plates because the part of the signal gets lost, when the delay Time not used. Usually, the vertical amplifier is a wide band amplifier which passes the entire band of frequencies.Īs the name suggests that, this circuit is used to, delay the signal for a period of time in the vertical section of CRT. The input signals are amplified by the vertical amplifier. When the electrons emitted by the electron gun strikes the phosphor screen of the CRT, a visual signal is displayed on the CRT. The major subsystem of a general purpose CRO consists of the following In the same way for CRO, the luminous spot of the electron beam acts as a stylus that moves over the display area in a response to input voltages. These are basically very fast x - y plotters that display input signal versus another signal. CRO is an extremely useful and versatile laboratory instrument used for the measurementĪnd analysis of waveforms and other phenomena in electronic circuits. ![]()
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