Q21: Which one is more advantageous, analog or digital oscilloscope, when observing the fine details of waveforms (e.g., observing parasitic waveforms below 1% when crossing zero and peaks)?
A: Observe the parasitic waveform below 1%, either analog oscilloscope or digital oscilloscope, observe its accuracy is not very good, the vertical accuracy of analog oscilloscope may not be higher than digital oscilloscope, such as a 500MHz bandwidth analog oscilloscope vertical accuracy is +/-3%, is not more advantageous than the digital oscilloscope (usually 1-2% accuracy), and for details, the automatic measurement function of digital oscilloscope than analog The automatic measurement function of digital oscilloscope is more accurate than the manual measurement of analog oscilloscope.
Q22: Which oscilloscopes from Yestech can test carrier signals with a frequency of 500M?
A: If only the carrier signal itself is measured, usually the carrier signal is a sine wave, we recommend using a 1.5GHz oscilloscope (Yestech 54845B) and connecting the object under test with a BNC cable to get a rise time measurement accuracy of ~94.6%. If a probe must be used, the 1157A active probe (2.5GHz bandwidth) is recommended. If you use a 500MHz bandwidth oscilloscope, even with a BNC cable, the best case amplitude measurement error is 29.3% and rise time measurement accuracy is 58.6%.
Q23: How can I use a Yestech oscilloscope to measure the Settle time of PLL?
A: It can be done by using the Yestech 548xx series oscilloscope + USB-GPIB 82357A adapter + software option. It can also be done with the lower cost modulation domain analyzer from keysight.
Q24: How do I test optical signals with a Yestech device?
A: Yestech has a full set of test solutions to measure optical signals, from light sources, spectrometers, optical multimeters, optical oscilloscopes, optical wavelength meters, etc. If you want to measure optical signals with a real-time oscilloscope, you can use a photoelectric converter combined with an oscilloscope to complete the measurement.
Q25: How to use oscilloscope to measure the output ripple value of some low ripple power supply? For example, to measure the output ripple of 1.8V, the output ripple is generally claimed to be less than 20mV, how can I verify it with an oscilloscope? And ordinary oscilloscope even if the direct probe connected to the probe ground clip noise will have twenty to thirty millivolts.
A: The problem of this is very representative. To use a high common mode rejection ratio of the voltage differential probe, it can work in a high noise environment.
Q26: How to view and read out the period of the displayed waveform with a digital oscilloscope?
A: All digital oscilloscopes support waveform period measurement, from the point of view of improving test accuracy, if you use the 5462x/546?x (except 546?5), you can select Counter in its measurement parameters, its embedded hardware frequency counter will be started for accurate frequency measurement (5digit), if you use other models of oscilloscopes, try to let the oscilloscope screen display a period of the signal, the amplitude as full as possible. Scale, when the measurement accuracy is generally better, you can use the oscilloscope's automatic measurement function, but also available cursor manual measurement.
Q27: What type of oscilloscope can effectively improve the design efficiency?
A: Oscilloscope development to the present stage, has raised the data analysis to an important position. The use of oscilloscope has not only in debugging to observe the waveform, more importantly, can be good in the design of analysis and calculation of device parameters, to help you optimize the design plan. Choose what kind of oscilloscope is most suitable to combine with the signal you want to observe and analyze to decide.
Q28: Switching power supply in the low temperature start (such as: -20 ℃ below) what are the special requirements?
A: The key is the temperature range of the device selection. For example, capacitors, MOSFETs, diodes, etc.
Q29: How to test the jitter component with an oscilloscope?
A: Deterministic jitter can be measured with an oscilloscope. The time width of the rising/falling edge can be read out on the oscilloscope, which can be converted to UIp-p according to the signal period, which is the peak amplitude of jitter, as shown below. For more details, please refer to the relevant information from oscilloscope manufacturers such as Tektronix.
Q30: How to distinguish between analog bandwidth and digital real-time bandwidth?
A: Bandwidth is one of the most important indicators of oscilloscopes. The bandwidth of analog oscilloscope is a fixed value, while the bandwidth of digital oscilloscope has two kinds of analog bandwidth and digital real-time bandwidth. Digital oscilloscope for repetitive signals using sequential sampling or random sampling technology can achieve the highest bandwidth for the oscilloscope's digital real-time bandwidth, digital real-time bandwidth and the highest digitization frequency and waveform reconstruction technology factor K related (digital real-time bandwidth = highest digitization rate / K), and generally not as an indicator directly given. From the definition of the two types of bandwidth can be seen, analog bandwidth is only suitable for the measurement of repetitive periodic signals, while digital real-time bandwidth is suitable for both repetitive signals and single signal measurements. Manufacturers claim that the bandwidth of the oscilloscope can reach how many megabytes, actually refers to the analog bandwidth, digital real-time bandwidth is to be lower than this value. For example, the bandwidth of TEK's TES520B is 500MHz, which actually means its analog bandwidth is 500MHz, while the maximum digital real-time bandwidth can only reach 400MHz, which is much lower than the analog bandwidth. Therefore, when measuring a single signal, be sure to refer to the digital real-time bandwidth of the digital oscilloscope, otherwise it will bring unexpected errors to the measurement.
Q21: Which one is more advantageous, analog or digital oscilloscope, when observing the fine details of waveforms (e.g., observing parasitic waveforms below 1% when crossing zero and peaks)?
A: Observe the parasitic waveform below 1%, either analog oscilloscope or digital oscilloscope, observe its accuracy is not very good, the vertical accuracy of analog oscilloscope may not be higher than digital oscilloscope, such as a 500MHz bandwidth analog oscilloscope vertical accuracy is +/-3%, is not more advantageous than the digital oscilloscope (usually 1-2% accuracy), and for details, the automatic measurement function of digital oscilloscope than analog The automatic measurement function of digital oscilloscope is more accurate than the manual measurement of analog oscilloscope.
Q22: Which oscilloscopes from Yestech can test carrier signals with a frequency of 500M?
A: If only the carrier signal itself is measured, usually the carrier signal is a sine wave, we recommend using a 1.5GHz oscilloscope (Yestech 54845B) and connecting the object under test with a BNC cable to get a rise time measurement accuracy of ~94.6%. If a probe must be used, the 1157A active probe (2.5GHz bandwidth) is recommended. If you use a 500MHz bandwidth oscilloscope, even with a BNC cable, the best case amplitude measurement error is 29.3% and rise time measurement accuracy is 58.6%.
Q23: How can I use a Yestech oscilloscope to measure the Settle time of PLL?
A: It can be done by using the Yestech 548xx series oscilloscope + USB-GPIB 82357A adapter + software option. It can also be done with the lower cost modulation domain analyzer from keysight.
Q24: How do I test optical signals with a Yestech device?
A: Yestech has a full set of test solutions to measure optical signals, from light sources, spectrometers, optical multimeters, optical oscilloscopes, optical wavelength meters, etc. If you want to measure optical signals with a real-time oscilloscope, you can use a photoelectric converter combined with an oscilloscope to complete the measurement.
Q25: How to use oscilloscope to measure the output ripple value of some low ripple power supply? For example, to measure the output ripple of 1.8V, the output ripple is generally claimed to be less than 20mV, how can I verify it with an oscilloscope? And ordinary oscilloscope even if the direct probe connected to the probe ground clip noise will have twenty to thirty millivolts.
A: The problem of this is very representative. To use a high common mode rejection ratio of the voltage differential probe, it can work in a high noise environment.
Q26: How to view and read out the period of the displayed waveform with a digital oscilloscope?
A: All digital oscilloscopes support waveform period measurement, from the point of view of improving test accuracy, if you use the 5462x/546?x (except 546?5), you can select Counter in its measurement parameters, its embedded hardware frequency counter will be started for accurate frequency measurement (5digit), if you use other models of oscilloscopes, try to let the oscilloscope screen display a period of the signal, the amplitude as full as possible. Scale, when the measurement accuracy is generally better, you can use the oscilloscope's automatic measurement function, but also available cursor manual measurement.
Q27: What type of oscilloscope can effectively improve the design efficiency?
A: Oscilloscope development to the present stage, has raised the data analysis to an important position. The use of oscilloscope has not only in debugging to observe the waveform, more importantly, can be good in the design of analysis and calculation of device parameters, to help you optimize the design plan. Choose what kind of oscilloscope is most suitable to combine with the signal you want to observe and analyze to decide.
Q28: Switching power supply in the low temperature start (such as: -20 ℃ below) what are the special requirements?
A: The key is the temperature range of the device selection. For example, capacitors, MOSFETs, diodes, etc.
Q29: How to test the jitter component with an oscilloscope?
A: Deterministic jitter can be measured with an oscilloscope. The time width of the rising/falling edge can be read out on the oscilloscope, which can be converted to UIp-p according to the signal period, which is the peak amplitude of jitter, as shown below. For more details, please refer to the relevant information from oscilloscope manufacturers such as Tektronix.
Q30: How to distinguish between analog bandwidth and digital real-time bandwidth?
A: Bandwidth is one of the most important indicators of oscilloscopes. The bandwidth of analog oscilloscope is a fixed value, while the bandwidth of digital oscilloscope has two kinds of analog bandwidth and digital real-time bandwidth. Digital oscilloscope for repetitive signals using sequential sampling or random sampling technology can achieve the highest bandwidth for the oscilloscope's digital real-time bandwidth, digital real-time bandwidth and the highest digitization frequency and waveform reconstruction technology factor K related (digital real-time bandwidth = highest digitization rate / K), and generally not as an indicator directly given. From the definition of the two types of bandwidth can be seen, analog bandwidth is only suitable for the measurement of repetitive periodic signals, while digital real-time bandwidth is suitable for both repetitive signals and single signal measurements. Manufacturers claim that the bandwidth of the oscilloscope can reach how many megabytes, actually refers to the analog bandwidth, digital real-time bandwidth is to be lower than this value. For example, the bandwidth of TEK's TES520B is 500MHz, which actually means its analog bandwidth is 500MHz, while the maximum digital real-time bandwidth can only reach 400MHz, which is much lower than the analog bandwidth. Therefore, when measuring a single signal, be sure to refer to the digital real-time bandwidth of the digital oscilloscope, otherwise it will bring unexpected errors to the measurement.
