The six acquisition modes of the oscilloscope make signal acquisition easier!
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The six acquisition modes of the oscilloscope make signal acquisition easier!

Posted Date: 2024-01-21

The six acquisition modes of the oscilloscope make signal acquisition easier!

An oscilloscope is a measuring instrument widely used in the fields of electronics, electrical engineering and communications. It can convert electrical signals into visual waveforms so that signal characteristics can be observed and analyzed. In practical applications, oscilloscopes have many different signal acquisition modes, and each mode has its own characteristics and scope of application. Next, I will introduce six common oscilloscope acquisition modes and analyze which mode is better to choose in different situations.

1. Real-time collection mode:

Real-time acquisition mode is the most basic and commonly used mode of the oscilloscope. It collects signals at the fastest sampling rate (usually GS/s level) and displays the waveform in real time. This mode is suitable for applications that require high time resolution, such as observing high-frequency signals, transient signals, rapidly changing waveforms, etc.

2. Equivalent time acquisition mode:

The equivalent time acquisition mode obtains waveforms by sampling multiple cycles and performing interpolation calculations. Its sampling rate is usually low (MHz level) and is suitable for observing steady-state and periodic signals, such as audio signals, low-frequency oscillation signals, etc. Due to the low sampling rate, the equivalent time acquisition mode may not be able to accurately restore the signal waveform under high-frequency signals, so it is mainly used for lower-frequency applications.

3. Segmented collection mode:

The segmented acquisition mode divides long-lasting signal waveforms into multiple segments for acquisition and storage. Each segment can be set according to the trigger conditions, and only the waveform segments that meet the trigger conditions are saved. This mode is suitable for observing sparse events, intermittent signals, etc., and can save storage space and analysis time.

4. Persistent acquisition mode:

The persistent acquisition mode displays waveforms by accumulating multiple sampling results. The color of the sampling point will be displayed cumulatively according to the number of occurrences, and the repeated signals will be displayed with emphasis, so that low-amplitude noise or slowly changing signals can be observed more clearly. This mode is suitable for applications such as weak signal observation and noise analysis.

5. Single acquisition mode:

Single acquisition mode refers to taking only one complete sample and displaying it on the screen. This mode is suitable for observing single events, non-repeating signals, etc. Since only one sampling is performed, appropriate triggering conditions are required to ensure that the signal of interest is acquired.

6. Encrypted collection mode:

The encrypted acquisition mode averages multiple sampling results to reduce noise. It can obtain a smooth waveform by sampling multiple triggers and averaging the waveforms. This mode is suitable for observing signals with larger measurement noise, and can also increase vertical resolution.

The above are the six common signal acquisition modes of oscilloscopes. Each mode has its own characteristics and scope of application. When selecting the acquisition mode, we need to consider the frequency, amplitude, stability, noise and other factors of the signal. Below I will detail which mode is better to choose in different situations.

1. High frequency signal collection:

For high-frequency signals, we usually choose real-time acquisition mode. Due to the rapid changes of high-frequency signals, a fast sampling rate is required to restore the signal waveform to ensure that accurate waveform characteristics are observed.

2. Low-frequency signal collection:

For low frequency signals, equivalent time acquisition mode is ideal. Since the low-frequency signal has a long period, the acquisition rate is not required, and the equivalent time acquisition mode can improve the time resolution of sampling through multiple cycles of sampling to obtain a steady-state waveform.

3. Sparse event collection:

For sparse events, segmented acquisition mode can capture events better. By setting appropriate trigger conditions, only waveform segments that meet the conditions will be saved, thus saving storage space and analysis time.

4. Weak signal collection:

For weak signals, persistent acquisition mode can enhance the signal display. Since weak signals are easily interfered by noise, the persistent acquisition mode can increase the display effect of the signal by accumulating multiple sampling results.

5. Single event collection:

For single events, single acquisition mode ensures that the signal of interest is acquired. After setting the appropriate trigger conditions, the oscilloscope can perform a complete sampling when the trigger event occurs to obtain the complete waveform.

6. Noise signal collection:

For signals with noise, encryption acquisition mode can smooth the signal and reduce noise interference. By triggering multiple times and averaging the sampling results, a clearer and more stable waveform can be obtained.

It should be noted that the selection of acquisition mode also needs to be comprehensively considered based on the specific oscilloscope model and application requirements. Different models of oscilloscopes may differ in sampling rate, storage capacity, trigger function, etc., which will also affect the selection of acquisition mode. In addition, experiments and tests should be conducted based on actual needs to determine the most suitable acquisition mode.

To sum up, according to the characteristics and needs of the signal, you can choose the appropriate oscilloscope acquisition mode to better obtain the waveform characteristics of the signal for observation and analysis. Whether it is high-frequency signals, low-frequency signals, sparse events or weak signals, there are corresponding acquisition modes that can be applied. By selecting an appropriate acquisition mode, signal acquisition can be made easier and measurement results improved.


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