[Keysight Technologies Thanksgiving Month Essay] + How to use an oscilloscope to test the maximum transient value[Copy link]
This content is originally created by luck_gfb, a user of EEWORLD forum. If you need to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source. In the process of power supply debugging, we usually test the maximum peak voltage value of the two terminals of MOS and power diodes when turning on and off and in large dynamics, and then compare it with the rated value of the device specification to see if it is within the requirements of the device manufacturer. If it exceeds the specification range, the device is at risk of damage, and it will also affect the reliability of the product. Therefore, the maximum value measurement of transient voltage and current is very important in the process of power supply debugging. So how can we use an oscilloscope to measure these transient values? Here, taking Keysight DSO-X 3034A as an example, we will briefly introduce the test method. After turning on the oscilloscope, press the horizontal button in the horizontal setting area, set the horizontal mode to "standard", then press the coupling button in the trigger setting area, set the trigger mode to "standard", then adjust the amplitude knob to the appropriate position in the vertical setting area, set the coupling to DC coupling, and then adjust the horizontal setting knob to the appropriate position, so that the basic settings are completed. Then, according to the amplitude of the waveform being measured, continuously adjust the trigger level knob in the trigger setting area. Until no new waveform is captured. Usually, the bandwidth should be set to 20MHZ to avoid capturing environmental interference signals. In this setting state, the oscilloscope will display "Trigger?" in the upper right corner, and it will automatically stop each time a waveform is captured. When the trigger level is at a low position, continuous waveforms can also be displayed. The difference between this setting and the single trigger is that the single trigger is easy to capture waveforms that are not what you want, and this setting can be captured repeatedly until a satisfactory waveform is captured. The function of the Keysight oscilloscope is very powerful, and the measurement power required in power supply design can basically meet the requirements. In 2018, Keysight is giving away oscilloscopes for free! Scan the QR code and sign up once. You will win prizes every day during the working days of March!
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