Now, let us discuss about these special purpose oscilloscopes one by one.
As shown in above figure, the CRT of Dual Beam Oscilloscope consists of two sets of vertical deflection plates and one set of horizontal deflection plates.
The combination of the following blocks together is called a channel.
There are two channels in Dual Beam Oscilloscope. So, we can apply the two signals, namely A & B as input of channel A & Channel B respectively. We can choose any one of these four signals as trigger input to the trigger circuit by using a switch. Those are input signals A & B, External signal (Ext) and Line input.
This oscilloscope will produce two vertically deflected beams, since there are two pairs of vertical deflection plates. In this oscilloscope, the blocks which are useful for deflecting the beam in horizontal direction is common for both the input signals. Finally, this oscilloscope will produce the two input signals simultaneously on the screen of CRT.
The Digital Storage Oscilloscope stores the data in digital before it displays the waveform on the screen. Whereas, the basic oscilloscope doesn’t have this feature.
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