DA output waveform test

garin.

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How do I test the output waveform of DA in the circuit shown in the figure? I am a complete newbie. Thanks for your help!

chunyang

What do you want to ask? If you just want to measure the waveform, you can use an oscilloscope to check it, but does this question have any meaning?

garin.

chunyang posted on 2019-1-24 14:26 What do you want to ask? If you just want to measure the waveform, you can use an oscilloscope to see it, but does this question have any meaning?

The waveform on the oscilloscope is very messy, is there something wrong with the circuit?

chunyang

garin. Posted on 2019-1-24 14:29 The waveform on the oscilloscope is very messy, is there a problem with the circuit?

If the output is a non-continuous periodic signal, it is normal to look messy directly with the naked eye. Use a storage oscilloscope to capture the waveform and then look at it. If the output should be a continuous periodic signal, and you have operated the oscilloscope correctly, then consider whether it is a circuit problem.

garin.

chunyang posted on 2019-1-24 14:26 What do you want to ask? If you just want to measure the waveform, you can use an oscilloscope to see it, but does this question have any meaning?

Does the oscilloscope need to be set up?

chunyang

Of course, there are problems with your circuit, but first figure out what the input is and what the corresponding output is.

garin.

chunyang posted on 2019-1-24 14:35 Of course, there are problems with your circuit, but first figure out what the input is and what the corresponding output is.

OK, I'll take a closer look. Thank you very much!

chunyang

garin. Posted on 2019-1-24 14:34 Does the oscilloscope need any settings?

Of course, it needs to be set up to match the signal to be tested, but this cannot be explained in the forum. It is best to read the oscilloscope manual and books on skills, try more, summarize more, and observe the waveform of the signal generator first, so that it will be easier to master.

garin.

chunyang posted on 2019-1-24 14:35 Of course, there are problems with your circuit, but first figure out what the input is and what the corresponding output is.

Can you help me take a look at this temperature sampling circuit? I would like to ask how the final temperature value is calculated? Is it to directly measure the resistance of the temperature sensor or to measure the voltage at both ends? NTC temperature sensor

chunyang

garin. Posted on 2019-1-24 14:41 Can you help me look at this temperature sampling circuit? I would like to ask how the final temperature value is calculated? It is directly measured by the temperature sensor...

This circuit is just a voltage follower, which is a small part of the whole circuit. There is no way to talk about how to calculate it. The host really needs to make up for the basics.

garin.

chunyang posted on 2019-1-24 15:04 This circuit is just a voltage follower, a small part of the whole circuit, there is no such thing as how to calculate, the OP really needs to make up for the basics.

Yes, I am just getting started, and my basics are really very poor. Then I can ask how the final temperature value of the NTC temperature sensor in the circuit is determined? Is it measured by resistance and then corresponding to the sensor resistance table? Or is it determined based on the potential?

ou513

Isn't NTC a thermistor? This is used as an adjustable resistor. After the signal conditioning circuit, the voltage at the front end of the ADC corresponds to the temperature calculated by your circuit design. The NTC specification data will give a temperature and resistance calculation formula. I also say that you need to make up for the basics first. NTC is included in the basic experimental courses in schools.

chunyang

garin. Posted on 2019-1-24 16:49 Yes, I am just getting started and my basics are really poor. Then I can ask how the final temperature value of the NTC temperature sensor in the circuit is determined...

Generally speaking, a voltage related to temperature is finally obtained, and the voltage value is converted into a temperature value. The specific correspondence depends on the value of the NTC, the circuit design, etc.

常见泽1

First, the DA waveform can be viewed directly on an oscilloscope. This is how the DA port output of the microcontroller is played. I have done this NTC project and found a parameter table in the manual. The temperature can be obtained by looking up the table.

garin.

Common Ze 1 posted on 2019-1-24 18:20 First of all, the DA waveform can be viewed directly on an oscilloscope. The DA port output of the microcontroller is played in this way. I have done this NTC project and found a parameter table in the manual...

Thank you very much, the problem has been solved

garin.

chunyang posted on 2019-1-24 17:40 Generally speaking, we get a voltage related to temperature in the end, which is converted into a temperature value according to the voltage value. The specific correspondence depends on the value of NTC...

Thank you very much, the problem has been solved

garin.

ou513 Published on 2019-1-24 17:09 Isn't NTC a thermistor? This is used as an adjustable resistor. As for the final voltage entering the ADC front end after passing through the signal conditioning circuit, it corresponds to your circuit design...

Thank you very much, the problem has been solved.