【初心者向け】オシロスコープの使い方 | [Beginners] How to use oscilloscope
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2 سال پیش
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In this video, I would
In this video, I would like to talk about the topic of how to use an oscilloscope.
If you are not sure whether or not to buy one, or if you have bought one but do not know how to use it, please refer to this video.
-Related Link
OWON Digital Oscilloscope SDS1022
https://amzn.to/3xN5ZyQ
-Self introduction
Hardware engineer
9 years experience of electronics
-SNS
Web : https://lab-b.jp
Twitter : Twitter: buonoatsushi
-Text
First, let me explain the basics of oscilloscopes.
An oscilloscope is a measuring instrument used to view changes in voltage over time at a given point. It consists of a probe to grab the point to be measured and a main unit to process the captured voltage and display it on a monitor. Testers are often used to view voltages, but the biggest difference between testers and probes is that testers are able to capture changes over time. Testers, in fact, only display averaged voltage values over time, so they cannot capture fast voltage changes. Oscilloscopes, on the other hand, can capture high-speed signals on the order of several ns for fast ones.
Therefore, oscilloscopes are used in all situations where time is involved, for example, to check the output value of a sensor over time, to check whether the signals to turn a motor are in the correct order, or to check whether the rise time of a signal is within a specified range.
To explain the principle, oscilloscopes and probes generally contain such a circuit, which, after reducing the voltage to 1/10 of the voltage to be measured, captures it into the CPU through analog-to-digital conversion and displays the waveforms. The reason why the voltage is reduced to 1/10 here is to minimize the effect on the measurement target. By putting a large resistor in the measurement system, the current flowing to the measurement target remains almost the same even when the probe is connected, so that accurate voltage values can be measured.
Next, let me explain the basics before using an oscilloscope.
Here, I would like to use an oscilloscope provided by a manufacturer called OWON. The basic functions and usage of other oscilloscopes are almost the same.
First, as for how to view the oscilloscope screen, the horizontal axis represents time and the vertical axis represents the magnitude of voltage. The rightmost horizontal axis is the most recent information, and time flows from right to left. The yellow and blue lines are the voltages for channel 1 and channel 2, respectively, and the lines here are the respective 0V standards. The numbers here represent the time per square and the voltage value per square.
The operating part of the oscilloscope is roughly divided into these two parts. The two main parts are used to adjust the length and position of the time axis here and the size and position of the voltage axis here.
The other important part is to adjust the position of this trigger. The trigger is the reference point at which the waveform should be displayed when the voltage is above or below a certain V value. Oscilloscopes cut off a certain portion of continuous time and display it, but if the cut-off width is short, the display will switch from one time to another at high speed if all the time is displayed, and the human eye will not be able to follow it very well. To use an analogy, it is like switching channels on a TV at high speed. In order to take the time to watch the program you want to watch, we generally set this trigger to take in the screen only when the voltage meets a certain criterion and ignore the rest. The trigger is a bit hard to understand, but it is a super important part of using the oscilloscope, so be sure to keep it in mind.
Next, let me explain the probes. Each probe has an alligator clip on the end like this, and the alligator clip is attached to GND, and the probe is used to pinch the point you want to measure in the circuit with the tip. What you must do before measurement is to adjust the probe to capture the voltage as accurately as possible. As explained earlier, oscilloscopes read the actual voltage at 1/10th of the actual voltage. However, if the frequency is high, the parasitic capacitor component that inevitably accompanies the probe will cause the voltage to become unbalanced, making it impossible to accurately measure the value. Therefore, by adjusting the value of the variable capacitor here, it can be reduced to approximately 1/10 of the original value at any frequency.
When adjusting the probe, first connect the GND wire to the bottom of this protrusion on the front of the oscilloscope and the probe to the top. Then, press the Autoset button. Then, the voltage and time axes are automatically adjusted so that the waveform fits on the screen. Since a pulse signal with an amplitude of 5 V and a frequency of 1 kHz is emitted from this protrusion, the waveform should normally display a beautiful, crisp waveform.
If you are not sure whether or not to buy one, or if you have bought one but do not know how to use it, please refer to this video.
-Related Link
OWON Digital Oscilloscope SDS1022
https://amzn.to/3xN5ZyQ
-Self introduction
Hardware engineer
9 years experience of electronics
-SNS
Web : https://lab-b.jp
Twitter : Twitter: buonoatsushi
-Text
First, let me explain the basics of oscilloscopes.
An oscilloscope is a measuring instrument used to view changes in voltage over time at a given point. It consists of a probe to grab the point to be measured and a main unit to process the captured voltage and display it on a monitor. Testers are often used to view voltages, but the biggest difference between testers and probes is that testers are able to capture changes over time. Testers, in fact, only display averaged voltage values over time, so they cannot capture fast voltage changes. Oscilloscopes, on the other hand, can capture high-speed signals on the order of several ns for fast ones.
Therefore, oscilloscopes are used in all situations where time is involved, for example, to check the output value of a sensor over time, to check whether the signals to turn a motor are in the correct order, or to check whether the rise time of a signal is within a specified range.
To explain the principle, oscilloscopes and probes generally contain such a circuit, which, after reducing the voltage to 1/10 of the voltage to be measured, captures it into the CPU through analog-to-digital conversion and displays the waveforms. The reason why the voltage is reduced to 1/10 here is to minimize the effect on the measurement target. By putting a large resistor in the measurement system, the current flowing to the measurement target remains almost the same even when the probe is connected, so that accurate voltage values can be measured.
Next, let me explain the basics before using an oscilloscope.
Here, I would like to use an oscilloscope provided by a manufacturer called OWON. The basic functions and usage of other oscilloscopes are almost the same.
First, as for how to view the oscilloscope screen, the horizontal axis represents time and the vertical axis represents the magnitude of voltage. The rightmost horizontal axis is the most recent information, and time flows from right to left. The yellow and blue lines are the voltages for channel 1 and channel 2, respectively, and the lines here are the respective 0V standards. The numbers here represent the time per square and the voltage value per square.
The operating part of the oscilloscope is roughly divided into these two parts. The two main parts are used to adjust the length and position of the time axis here and the size and position of the voltage axis here.
The other important part is to adjust the position of this trigger. The trigger is the reference point at which the waveform should be displayed when the voltage is above or below a certain V value. Oscilloscopes cut off a certain portion of continuous time and display it, but if the cut-off width is short, the display will switch from one time to another at high speed if all the time is displayed, and the human eye will not be able to follow it very well. To use an analogy, it is like switching channels on a TV at high speed. In order to take the time to watch the program you want to watch, we generally set this trigger to take in the screen only when the voltage meets a certain criterion and ignore the rest. The trigger is a bit hard to understand, but it is a super important part of using the oscilloscope, so be sure to keep it in mind.
Next, let me explain the probes. Each probe has an alligator clip on the end like this, and the alligator clip is attached to GND, and the probe is used to pinch the point you want to measure in the circuit with the tip. What you must do before measurement is to adjust the probe to capture the voltage as accurately as possible. As explained earlier, oscilloscopes read the actual voltage at 1/10th of the actual voltage. However, if the frequency is high, the parasitic capacitor component that inevitably accompanies the probe will cause the voltage to become unbalanced, making it impossible to accurately measure the value. Therefore, by adjusting the value of the variable capacitor here, it can be reduced to approximately 1/10 of the original value at any frequency.
When adjusting the probe, first connect the GND wire to the bottom of this protrusion on the front of the oscilloscope and the probe to the top. Then, press the Autoset button. Then, the voltage and time axes are automatically adjusted so that the waveform fits on the screen. Since a pulse signal with an amplitude of 5 V and a frequency of 1 kHz is emitted from this protrusion, the waveform should normally display a beautiful, crisp waveform.
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