The oscilloscope’s bandwidth should be >2¥ the fundamental highest frequency signal to be measured. The bandwidth of the scope’s vertical system can affect the scope’s ability to correctly display narrow pulses and to make time interval measurements.
3. How many channels? Most oscilloscopes in use today are dual-channel models. In addition, there are models described as being 2+2 and four channels. This is one time where 2+2 is not equal to 4. The 2+2 models have limited features on two of their channels and cost less than 4-channel models. Most oscilloscope suppliers will hold the 4-channel description only for models with four fullfeatured channels, but the user should check the model under consideration so as to be sure if it is a 4- or 2+2 model. Either of the four channel classes is useful for applications involving the testing and development of digital-based systems where the relationship of several signals must be observed.