Q1: How can I test the signal quality for 100M Ethernet signals and Gigabit Ethernet? How many are recommended for desktop devices? How many are recommended for portable devices?
A1: The Ethernet physical layer signal quality can be tested by the widely used solution provided by Tektronix.
Q2: How to conduct power supply test?
A2: Tektronix provides a complete set of power supply testing solutions, including various current probes, voltage probes, and analysis software. Testable current amplitude from 1mA to 20KA, bandwidth from DC to 2GHz; testable voltage, amplitude from 1mV to 40KV, bandwidth DC to 1GHz (low voltage can be 16GHz), these ranges are the most extensive in the industry. Testable items include: switching loss of switching devices, safe working area; inductance of magnetic components, magnetic loss, BH curve, conductivity, etc .; power supply ripple, power factor, current harmonic analysis, etc. Many of the test items are only provided by Tektronix.
Q3: What are the impacts of the oscilloscope's storage depth on signal testing?
A3: The memory depth will affect the test window and test items of the oscilloscope. For example, the sampling rate of 20GS / s, the maximum storage depth of 1M or the sampling rate of 40GS / s and the maximum storage depth of 2M, which are equipped with traditional oscilloscopes, can only collect signals of 50us.
Q4: Please illustrate the application of digital fluorescent oscilloscope in the design and debugging of automotive electronics.
A4: The digital fluorescent oscilloscope provides the timing and protocol decoding analysis functions of CAN bus and LIN bus. It can synchronously decode the control network with CAN and LIN bus, and test the transmission accuracy and error tolerance between the networks. Locate network synchronization faults by testing crystal tolerance and transmission delay. Through the integrated search function to achieve fault debugging at the data link layer. Through the eye diagram test of the CAN signal, the noise on the CAN data packet caused by jitter, amplitude distortion and glitch can be analyzed. Complex triggering conditions: frame type (data, remote, error, overload), identifier, data, acknowledgment loss, and bit stuffing errors can be used to trigger the collection of positioning signal characteristics and faults.
Q5: Can the digital oscilloscope measure AC220 mains power directly? How to measure mains power?
A5: High voltage probe can be selected.
Q6: How should I define the trigger signal required by the user?
A6: It is recommended to discover the specific parameters of the signal we want to trigger through the DPO function, such as amplitude time and other information.
Q7: The Cass-D amplifier is output through the inductor. I want to test the output waveform. How do I connect the oscilloscope probe?
A7: Just connect the oscilloscope probe to the inductor.
Q8: Can the jitter parameters be set? For example, time and frequency.
A8: The number of test samples (that is, test time / number) can be changed during actual jitter test.
Q9: What is the function of Tektronix digital fluorescent oscilloscope? What is the difference between this oscilloscope and traditional oscilloscope?
A9: The biggest difference is that the waveform capture rate is greatly provided. This and refresh rate are not a concept, which can help us fundamentally increase the probability of capturing accidental failures. The other is the performance improvement on the display.
Q10: Suppose I want to capture 20MHz RF signal, sinusoidal signal, does my oscilloscope bandwidth need 1GHz bandwidth?
A10: If it is a sinusoidal signal, it does not need to be as high as 1G. In addition, how much bandwidth is required depends on our test accuracy requirements.
Q11: How to debug DDR or DDR2 SDRAM?
A11: For DDR and DDRII signals, there is no standard for the signal itself, so the accurate test should be based on the requirements of different DDR / DDRII chips, including the voltage / timing relationship of the signal.
Q12: What is the biggest advantage of DPO? What are the main points of selection?
A12: The biggest advantage is the very high waveform capture rate, which can help us find occasional faults and at the same time can help us accumulate enough test samples in a short period of time.
Q13: How to test PSRR with an oscilloscope?
A13: The ratio of the percentage of full-scale voltage change to the percentage of power supply voltage change is usually called the power supply rejection ratio. The power supply rejection ratio can be divided into AC power supply rejection ratio and DC power supply rejection ratio.
Q14: What is the difference between a digital oscilloscope and a fluorescent oscilloscope?
A14: The digital fluorescent oscilloscope is the third-generation oscilloscope with innovative design based on the digital storage oscilloscope. It greatly provides the waveform capture rate, and also greatly improves triggering, bandwidth, and performance.
Q15: How to solve the grounding problem of the probe when measuring high frequency? Is it sufficient if the ground of the probe is connected to the ground of the oscilloscope probe?
A15: The ground of the probe should also be connected to the ground of the DUT to ensure that the test system and the DUT share the same ground.
Q16: Is there any good solution to reduce the trouble caused by the parasitic inductance of the oscilloscope probe when debugging high-frequency circuits?
A16: The first is to choose the appropriate probe; the second is to make the ground wire as short as possible, and the ground signal should be near the detection signal. The loop formed between the ground wire and the signal under test is the shortest.
Q17: When the amplitude of the detected signal changes regularly between 2.5-10mV, the frequency is: 70.7MHz. The bandwidth of the oscilloscope is 500M. How to distinguish the effective signal from the noise of the oscilloscope?
A17: You can use termination to connect the oscilloscope channel to 50 ohms. First test the noise of the oscilloscope itself. Or consult the oscilloscope manual, so that when you test the actual signal, you will know the impact of the oscilloscope noise on your signal.
Q18: I would like to ask, if the test signal is difficult to measure during the test, for example, inside the cabinet, you can only fly the wire out, how to reduce the impact of this measurement?
A18: Use a better flying lead, and at the same time, the signal wire and the ground wire should be as close as possible to ensure a better coupling. Also keep it as short as possible.
Q19: What format is the stored file?
A19: The oscilloscope can store various contents such as waveform data, pictures and settings as required. The file format can be a special file format that can be recognized by tools such as binary, text, CSV and Mablab.
Q20: When choosing an oscilloscope, what are the main indicators to buy from?
A20: Select an oscilloscope. You need to consider the oscilloscope's bandwidth, sampling rate, storage depth, number of channels, analysis capabilities, probes, and other indicators and related factors according to the frequency, amplitude, type, and number of signals to be tested. Relationships cannot be listed here. You can obtain the "Digital Phosphor Oscilloscope Selection Guide", which has detailed descriptions of related issues.
Q21: How many logic analyzers does the oscilloscope have?
A21: MSO mixed signal oscilloscope in the family of digital fluorescent oscilloscopes, with 16 digital channels. The general oscilloscope does not have a digital channel, but you can use the iLink tool set to integrate any Tektronix oscilloscope root with any Tektronix digital fluorescent oscilloscope to form a time-logic domain comprehensive test system
Q22: We have a TDS2024B oscilloscope, but when connected to the computer through Ni's software, the waveform is a little delayed, how to solve it?
A22: Transmission delay is inevitable, you can try to use a faster connection to reduce the delay.
Q23: How to choose an oscilloscope according to data rate, test eye diagram, etc. For example, 5Gbps
A23: The fundamental frequency of the 5Gbps signal is half of the data rate, which is 2.5GHz. To verify the signal of this rate, it is generally necessary to collect the 5th harmonic, that is, the oscilloscope of 12.5GHz. If debugging, the bandwidth requirements can be reduced slightly.
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