Oscilloscope as an electrical engineer is the most commonly used instruments, from the very beginning of the analog oscilloscope, fluorescent to digital storage oscilloscope and digital oscilloscope, and more and more towards professional custom classes oscilloscope, function is more and more rich at the same time, also the rapid changes in performance, when consumer is choosing sometimes could see more dazzling, so how to choose suits own an oscilloscope?We know that oscilloscope three core indicators are bandwidth, sampling rate, storage depth, but in the selection of digital oscilloscope there is a very important index is often ignored, that is, we will talk about the waveform refresh rate today, also known as waveform capture rate!
Waveform capture rate is relative to the digital oscilloscope.Digital oscilloscope sampling, processing data to the display screen is required time, data processing and display screen this time is called dead zone time.Therefore, not all waveforms can be seen on the screen. In fact, the waveforms we see are actually divided into segments by the time of the dead zone, so there is a wave capture rate. Sampling time + dead zone time = waveform capture period.And waveform capture rate refers to the number of waveform capture in a second, that is, the inverse of waveform capture cycle
In consecutive multiple capture cycles, the longer the dead zone time is, the shorter the relative effective capture time is. Once the waveform capture rate of oscilloscope is too low, abnormal signals may be missed in the dead zone time.It can be seen that oscilloscope waveform capture rate for whether to capture the low probability of abnormal signal is very critical, signal inside the random abnormal signal and occasional signal is often unable to be predicted, the higher the waveform capture rate, the more conducive to capture the low probability of signal!