![]() Bandwidth: One important oscilloscope specification is related to the speed of the waveforms that can be measured.This defines the magnitude of the input signal that will cause a deflection of one division on the screen. Selection of the appropriate input amplifier / attenuator is made by setting a volt/div control associated with each oscilloscope channel. These condition the measured signal to the optimum magnitude for input to the main amplifier and vertical deflection plates, thus enabling the instrument to measure a very wide range of different signal magnitudes. Sensitivity: A series of attenuators and pre-amplifiers exist at the input to the oscilloscope.A simplified block diagram of an analog oscilloscope is shown in below figure. ![]() There are two main classes of oscilloscopes: analog oscilloscopes and digital oscilloscopes.Further disadvantages of oscilloscopes include their fragility and their moderately high cost. However, it is not a particularly accurate instrument and is best used where only an approximate measurement is required.As a test instrument, it is often required to measure voltages whose frequency and magnitude are totally unknown. One particularly strong merit of the oscilloscopes its high input impedance, typically 1M, which means that the instrument has a negligible loading effect in most measurement situations. The more expensive models can measure signals at frequencies up to 500 MHz and even the cheapest models can measure signals at frequencies up to 20 MHz. It can also indicate the nature and magnitude of noise that may be corrupting the measurement signal. Unlike meters, which only allow the user to measure amplitude information, the oscilloscope allows the user to view the instantaneous voltage versus time such displayed plot of the signal can be used for various measurements like peak voltage, frequency, phase, time period, rise time etc.The cathode ray oscilloscope is probably the most versatile and useful instrument available for signal measurement. ![]()
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