Notice the Bandwidth When Using Digital Oscilloscope
Digital oscilloscope has unique features like waveform triggering, storage, display, measurement, waveform data analyzing and processing and so on, whose usage is increasingly popular. As there is a big difference between the performance of digital oscilloscopes and virtual oscilloscopes, if used improperly, it will lead to a large measurement error and affect the test tasks, so we must pay more attention to the bandwidth. First let's learn the differences of them.
Bandwidth is the most important indicator of the oscilloscope. Virtual oscilloscope has a fixed bandwidth, while that of digital one can be divided into virtual and digital real-time.
For repetitive signals using sequential sampling or random sampling techniques, digital oscilloscopes can achieve a maximum bandwidth that is the real-time one. The highest digital real-time bandwidth and frequency and waveform reconstruction of K-related factors (the bandwidth = high rate / K), are generally not given directly as an indicator. From their definition，we can see that virtual bandwidth is only suitable for repeated measurement of periodic signals, while the other one is suitable for signals and single signal measurement. Manufacturers claim the bandwidth of the oscilloscope can reach how much megabyte. However, they refer to analog bandwidth. Digital real-time one is less.
Therefore, when you choosing a digital oscilloscope, you should not believe the description about the bandwidth by manufactures as they refer to analog bandwidth. Especially, when measure a single signal, we must refer to the bandwidth of the oscilloscopes, or unexpected errors will occur during measurement.
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