Dak li teħid ta 'kampjuni rata huwa meħtieġ biex miżura diversi tipi ta' sinjali bi an oxxilloskopju ?
We input a signal to the oscilloscope through the probe. After the measured signal passes through the amplification, attenuation and other signal conditioning circuits at the front end of the oscilloscope, the high-speed ADC analog-to-digital converter performs signal sampling and digital quantization. The sampling rate of the oscilloscope is the analog-to-digital conversion of the input signal. The frequency of the sampling clock during conversion is, in layman's terms, the sampling interval. One sampling point is collected at each sampling interval. For example, a sampling rate of 1GSa/s means that the oscilloscope has the ability to collect 1 billion sampling points per second. At this time, its sampling intervall is 1 nanosecond.
Għal real-time oscilloscopes, the real-time sampling method is currently commonly used. The so-called real-time sampling is to perform continuous high-speed sampling at equal intervals on the measured waveform signal, and reconstruct or restore the waveform based on these continuously sampled sampled points. In the real-time sampling process, it is important to ensure li the sampling rate of the oscilloscope is much faster than il bidla ta ' is-sinjal li qed jiġi imkejjel.
Allura kif ħafna aktar mgħaġġel huwa it? The Nyquist law in digital signal processing says that if the bandwidth of the signal being measured is limited, then when sampling and quantizing the signal, if the sampling rate is is aktar than darbtejn the bandwidth of the signal being system of the signal being measured, it can be completely Reconstruct or recover the information carry in the signal without aliasing.
Li jmiss, we will make the time tone smaller, so that the sampling rate will become larger. We will adjust the sampling rate until the sampling rate is times times and 10 times the signal frequency to observe the signal changes, that is, 2c 2MSa/s and 10MSa/s. The signal on the left in the figure below is at a sampling rate of 2MSa/s. You can see that the frequency of is-sinjal is-sinjal inbidel back 1MHz, li is il korrett frekwenza valur ta' is-sinjal. But l-oriġinali sine mewġa sar sar a trijangolu mewġ, u il-forma tal-mewġ ġiet ġiet ġie mgħawweġ. Meta it it-teħid ta' kampjuni rata bidliet għal 10MSa/s, li is is-sinjal fuq il lemin in-naħa ta' il-figura taħt, tista' ara li is-sinjal is-sinjal is qed jasal ktar eqreb u eqreb a sine wave, iżda it is xorta mhux ħafna sabiħ.
