Selection of digital oscilloscope

The selection of digital oscilloscopes is measured by many hard indicators:
    oscilloscope bandwidth, oscilloscope real-time sampling rate, oscilloscope storage depth, number of channels, vertical sensitivity, trigger mode, mathematical operation, storage system, display system, configuration interface, probe, etc. Among the numerous technical indicators, there are still some principles that must be followed:
Principle 1: The bandwidth of the oscilloscope and probe should be at least 3-5 times the bandwidth of the signal to be measured
Principle 2: Generally speaking, a sampling rate of 4-5 times the bandwidth can reproduce the waveform more accurately
Principle 3: In order to make the timing measurement value close to the accuracy of the oscilloscope time base, the oscilloscope is required to be at least 20 times faster than the measured signal. In most cases, it is acceptable for the oscilloscope to be 3-5 times faster than the measured signal. The following
are some explanations of terms for digital oscilloscopes:
1 Oscilloscope bandwidth: Bandwidth is the frequency range used in the system. The bandwidth of a digital storage oscilloscope generally refers to the analog bandwidth.
When measuring analog signals, the highest frequency of the signal to be measured determines the oscilloscope
bandwidth. When measuring digital signals, the rise time usually determines the oscilloscope bandwidth.
Siglent's oscilloscopes provide 25MHz--300MHz bandwidth to meet different measurement needs.
2 Sampling rate: The sampling rate is the rate at which the waveform is sampled, defined as the maximum number of complete A/D conversions completed per unit time. Digital oscilloscopes use real-time sampling technology and equivalent sampling technology to collect waveforms. If the sampling rate is not enough, aliasing will easily occur.
The higher the sampling rate, the higher the accuracy of signal reconstruction.
The higher the sampling rate, the stronger the instrument's ability to capture signals.
The real-time sampling rate of Siglent 1000CE series oscilloscopes is as high as 2GS/s, and the equivalent is up to 50 GS/s, which is the highest among similar products.
3. Storage depth: also known as record length, it is expressed by the storage capacity occupied by recording one frame of waveform data. The storage capacity and horizontal resolution are numerically inversely related. The larger the storage capacity, the higher the horizontal resolution .
The storage depth of Siglent 1000C series oscilloscopes is up to 2M
4. Resolution: Resolution is used to reflect the comprehensive characteristics of the stored signal waveform details, including vertical resolution and horizontal resolution.
The vertical resolution of Siglent 1000 series oscilloscope is 8bit; the vertical sensitivity is: 2mv--10v/div
5 Display system: that is, the system for waveform display. Generally, it depends on the screen size, resolution, whether it is displayed in color, screen refresh rate, and waveform capture rate (digital fluorescent oscilloscopes will exaggerate this).
Siglent 1000 series oscilloscopes all use 5.7-inch TFT-LCD high-brightness display for display
6 Configuration interface: whether the oscilloscope can be expanded to support the corresponding interface. High-end oscilloscopes have USB storage, waveform printing, RS-232, Pass/Fail interface, etc.
Siglent 1000 series oscilloscopes all have the above interfaces, which is very convenient for waveform storage and printing
7 Trigger system: from the perspective of use, the quality of an oscilloscope depends a lot on its trigger system and whether it contains rich trigger methods. Selecting the appropriate trigger mode for detection makes it easy to find problems and greatly improves measurement efficiency.
The 1000 series oscilloscopes of Dingyang Technology (Siglent) have five trigger modes: edge, pulse, video, slope, and alternation, which are almost unique in domestic oscilloscopes.
8. Operation system: Digital oscilloscopes can save the triggered waveform and sample digital signals. Therefore, the waveform can be processed, which generally includes common mathematical operations, and high-end ones include FFT processing and other operations. The
1000 series oscilloscopes of Dingyang Technology (Siglent) have five operations: +, -, *, /, FFT, and can automatically measure 32 parameters at the same time. The function is at the top of digital oscilloscopes.
9. Probe: The selection of the probe is generally consistent with the bandwidth of the oscilloscope to ensure that the signal is input without distortion. Passive probes are generally used in China, and the measurement range is very wide and basically meets the general measurement needs. If there are special requirements for measurement, you can use active probes, differential probes and other exclusive probes.