Oscilloscope is a kind of electronic measuring instrument which is very widely used. It can transform the electrical signal invisible to the naked eye into a visible image, which facilitates people to study the change process of various electrical phenomena. The oscilloscope uses a narrow, high-speed electron beam composed of electrons, hitting the screen surface coated with fluorescent material, it can produce tiny dots of light (this is the working principle of the traditional analog oscilloscope).
Under the action of the measured signal, the electron beam is like the tip of a pen, which can depict the change curve of the instantaneous value of the measured signal on the screen surface. The oscilloscope can be used to observe the waveform curves of various different signal amplitudes over time, and it can also be used to test different kinds of power, such as voltage, current, frequency, phase difference, amplitude modulation, etc.
Q1: How to use oscilloscope to test and analyze the reliability of a product that has been designed and completed?
A: Oscilloscope has long been one of the most effective tools for testing electronic circuits. By observing the voltage and current waveforms at key nodes of the circuit, you can visually check whether the circuit is working properly and verify whether the design is appropriate. This is extremely helpful to improve reliability. Of course, the correct analysis of the waveform judgment depends on the engineer's own experience.
Q2: What are the main factors that determine the price of oscilloscope probes?
A: There are very many types of oscilloscope probes with different performance, such as high-voltage, differential, active high-speed probes, etc. The price also ranges from a few hundred RMB to nearly 10,000 USD. The main determinants of price are, of course, bandwidth and functionality. The probe is the part of the oscilloscope that touches the circuit, and a good probe can provide the fidelity needed for testing. In order to do this, even passive probes must have a very large number of passive device compensation circuits (RC networks) inside.
Q3: How long is the life of a typical Yestech oscilloscope probe? Does the probe need to be calibrated regularly?
A: The probe life of the oscilloscope is not easy to say, depending on the use of the environment and method. The standard for the probe does not have a clear measurement provisions, but for passive probes, at least in the replacement of the probe, the probe exchange channel, the probe must be adjusted for compensation. All active probes should have at least 20 minutes of warm-up before use, and some active probes and current probes need to be adjusted for zero drift.
Q4: What is the real-time sampling rate of oscilloscope?
A: Real-time sampling rate is the inverse of the sampling interval of one acquisition (one trigger) of the oscilloscope.
Q5: What is the oscilloscope equivalent time sampling?
A: Equivalent time sampling refers to the oscilloscope to multiple acquisitions (multiple triggers) to collect the waveform into a waveform, each sampling rate may be very slow, two acquisitions trigger point has a certain offset, the final formation of the inverse of the minimum sampling interval between the two points called the equivalent sampling rate. The index can be very high, such as 1ps.
Q6: What is power factor? How to how to measure it?
A: Power factor: In a DC circuit, the voltage times the current is the active power. But in an AC circuit, the voltage times the current is the apparent power, and part of the power that can play a role (i.e., active power) will be less than the apparent power. The ratio of active power to apparent power is called the power factor, expressed as COSΦ.
The simplest way to measure this is to measure the phase difference between voltage and current, and the result is the power factor.
Q7: Is there an oscilloscope that can analyze switching losses?
A: Tektronix's power test system, the TDS5000 series digital fluorescence oscilloscope, coupled with TDSPWR2 power analysis software can easily analyze switching losses and power losses per cycle, even including RDS ON.
Q8: Can oscilloscopes perform filtering? For example, low-pass filtering of PWM waves?
A: The TDS5000 can perform 20MHz, 150MHz low-pass filtering, and a digital low-pass filtering called high-resolution acquisition, in which the vertical resolution of the sampling points can be increased from 8bits to 12bits, and the above system can output a sine wave-like waveform with the trend of the pulse width of a signal such as PWM.
Q9: When using a digital oscilloscope, what are the principles for setting the B trigger and trigger level with the signal under test?
A: Tektronix oscilloscopes support A,B trigger function, simply put, you can dual-event sequence trigger, when you choose A-B seq, A event as the main trigger, with B event to capture complex waveforms. The trigger method is A event arm trigger system, when the defined B event appears at the B event trigger. For detailed trigger instructions, please refer to the oscilloscope manual.
Q10: How to use oscilloscope to measure differential signal?
A: The best way is to use a differential probe, when the measured signal is the most realistic and objective; if there is no differential probe, you can use two differential probes to two channels of the oscilloscope (such as Ch1, Ch2), and then use mathematical operations to get the waveform of ch1-ch2 and analyze, then try to keep the two probes exactly the same, the vertical scale of the oscilloscope two channels (how many volts per frame) set the same, otherwise, the error will be larger.
Oscilloscope is a kind of electronic measuring instrument which is very widely used. It can transform the electrical signal invisible to the naked eye into a visible image, which facilitates people to study the change process of various electrical phenomena. The oscilloscope uses a narrow, high-speed electron beam composed of electrons, hitting the screen surface coated with fluorescent material, it can produce tiny dots of light (this is the working principle of the traditional analog oscilloscope).
Under the action of the measured signal, the electron beam is like the tip of a pen, which can depict the change curve of the instantaneous value of the measured signal on the screen surface. The oscilloscope can be used to observe the waveform curves of various different signal amplitudes over time, and it can also be used to test different kinds of power, such as voltage, current, frequency, phase difference, amplitude modulation, etc.
Q1: How to use oscilloscope to test and analyze the reliability of a product that has been designed and completed?
A: Oscilloscope has long been one of the most effective tools for testing electronic circuits. By observing the voltage and current waveforms at key nodes of the circuit, you can visually check whether the circuit is working properly and verify whether the design is appropriate. This is extremely helpful to improve reliability. Of course, the correct analysis of the waveform judgment depends on the engineer's own experience.
Q2: What are the main factors that determine the price of oscilloscope probes?
A: There are very many types of oscilloscope probes with different performance, such as high-voltage, differential, active high-speed probes, etc. The price also ranges from a few hundred RMB to nearly 10,000 USD. The main determinants of price are, of course, bandwidth and functionality. The probe is the part of the oscilloscope that touches the circuit, and a good probe can provide the fidelity needed for testing. In order to do this, even passive probes must have a very large number of passive device compensation circuits (RC networks) inside.
Q3: How long is the life of a typical Yestech oscilloscope probe? Does the probe need to be calibrated regularly?
A: The probe life of the oscilloscope is not easy to say, depending on the use of the environment and method. The standard for the probe does not have a clear measurement provisions, but for passive probes, at least in the replacement of the probe, the probe exchange channel, the probe must be adjusted for compensation. All active probes should have at least 20 minutes of warm-up before use, and some active probes and current probes need to be adjusted for zero drift.
Q4: What is the real-time sampling rate of oscilloscope?
A: Real-time sampling rate is the inverse of the sampling interval of one acquisition (one trigger) of the oscilloscope.
Q5: What is the oscilloscope equivalent time sampling?
A: Equivalent time sampling refers to the oscilloscope to multiple acquisitions (multiple triggers) to collect the waveform into a waveform, each sampling rate may be very slow, two acquisitions trigger point has a certain offset, the final formation of the inverse of the minimum sampling interval between the two points called the equivalent sampling rate. The index can be very high, such as 1ps.
Q6: What is power factor? How to how to measure it?
A: Power factor: In a DC circuit, the voltage times the current is the active power. But in an AC circuit, the voltage times the current is the apparent power, and part of the power that can play a role (i.e., active power) will be less than the apparent power. The ratio of active power to apparent power is called the power factor, expressed as COSΦ.
The simplest way to measure this is to measure the phase difference between voltage and current, and the result is the power factor.
Q7: Is there an oscilloscope that can analyze switching losses?
A: Tektronix's power test system, the TDS5000 series digital fluorescence oscilloscope, coupled with TDSPWR2 power analysis software can easily analyze switching losses and power losses per cycle, even including RDS ON.
Q8: Can oscilloscopes perform filtering? For example, low-pass filtering of PWM waves?
A: The TDS5000 can perform 20MHz, 150MHz low-pass filtering, and a digital low-pass filtering called high-resolution acquisition, in which the vertical resolution of the sampling points can be increased from 8bits to 12bits, and the above system can output a sine wave-like waveform with the trend of the pulse width of a signal such as PWM.
Q9: When using a digital oscilloscope, what are the principles for setting the B trigger and trigger level with the signal under test?
A: Tektronix oscilloscopes support A,B trigger function, simply put, you can dual-event sequence trigger, when you choose A-B seq, A event as the main trigger, with B event to capture complex waveforms. The trigger method is A event arm trigger system, when the defined B event appears at the B event trigger. For detailed trigger instructions, please refer to the oscilloscope manual.
Q10: How to use oscilloscope to measure differential signal?
A: The best way is to use a differential probe, when the measured signal is the most realistic and objective; if there is no differential probe, you can use two differential probes to two channels of the oscilloscope (such as Ch1, Ch2), and then use mathematical operations to get the waveform of ch1-ch2 and analyze, then try to keep the two probes exactly the same, the vertical scale of the oscilloscope two channels (how many volts per frame) set the same, otherwise, the error will be larger.
