The vertical amplifier is the principal factor in determining the sensitivity and bandwidth of an oscilloscope. Most general purpose, laboratory quality oscilloscopes respond fully to frequencies in excess of 5 MHz.Therefore, the responsible amplifier, which is the vertical amplifier, is broadband. However, if the frequency response curve of the amplifier is flat beyond 3.58 MHz, the amplifier is classified as a broadband amplifier.
If the frequency band does not extend upto the television colour sub-carrier frequency of 3.58 MHz, the amplifier can be classified as the narrow band.
These categories of amplifiers are not sharply divided, nor is the classification universally accepted. On this basis, they can be classified as: They can be classified according to the bandwidth they use. There is another way of classifying oscilloscope amplifiers. signals.ĭC coupled amplifiers have the additional advantage, that they eliminate the problem of low frequency’ phase shift and accompanying waveform problem of waveform distortion when observing low frequency pulse train. Their use makes it possible to measure d.c. coupled amplifiers are expensive, they offer the advantage of responding to d.c. amplifiers are commonly used in oscilloscopes. Cathode ray Oscilloscope construction and Working.
This textbook “ Electrical and Electronics Measurements by S. The purpose of an oscilloscope is to give the accurate representation applied to its terminals at the input side, considerable attention has to be paid to the designing of these amplifiers for a faithful representation of input signals.The amplifiers used in oscilloscope can be classified into two types: As we have already discussed cathode ray oscilloscope, we use two amplifiers in Cathode ray oscilloscope(CRO) for the formation of graphical presentation on CRT screen.
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