Advantages of Sampling Oscilloscopes
1. High bandwidth
Since the sampling oscilloscope reconstructs the signal through multiple repeated samplings, even if the frequency of the measured signal is very high, the signal can also be reconstructed point by point through a very low sampling rate. At the same time, since there is no analog amplification circuit in front of the sampling chip, the signal bandwidth will not be limited, and a higher measurement bandwidth can be achieved.
2. Low cost
This product does not require an ADC chip. Even with the innovation of the times, the price of a sampling oscilloscope with the same bandwidth is far lower than that of a real-time oscilloscope.
3. High precision
Since the sampling rate of the ADC of a sampling oscilloscope can be very low, a higher-digit ADC chip can be used. Currently, most of the ADC chips used by digital sampling oscilloscopes have 14 or higher digits, which is much higher than 8-bit or 10-bit ADC chips. bit resolution of a real-time oscilloscope, so sampling oscilloscopes are widely used in fields such as high-speed chip measurement and metrology due to their low noise and high waveform accuracy.
4. Can directly measure optical signals
The product adopts a modular structure. Some modules have direct optical port inputs and built-in annotation filters used in optical communication measurements. Therefore, sampling oscilloscopes are also widely used in the field of optical communication and optical device measurement. In this regard, real-time oscilloscopes are much less useful than sampling oscilloscopes. Of course, there are disadvantages. Due to work limitations, the usage scenarios are not like those of real-time oscilloscopes. They can be roughly divided into the following points:
A synchronized trigger signal is required: a time axis or frequency division method that is synchronized with the measured signal must be used for triggering. Otherwise the measurement would not be possible.
Do not use the capture of single or occasional signals: If there are word transient signals in the measured signal, it will be difficult for the sampler to capture; or when there are occasional signals that occur very rarely, a very long period of data needs to be accumulated. observed.
Not suitable for on-board circuit debugging: Use a coaxial SMA interface or optical port for signal input, usually with a probe. Although you can also connect a real-time oscilloscope probe through some external power supply and conversion circuits, it is more troublesome to use. It is recommended to use a real-time oscilloscope to measure the signals on the PCB.
