I bought a TO1152 oscilloscope just to test and verify the problem.[Copy link]
A few days ago, I published the first test of Macco X's 202A. Many friends encouraged me to disassemble it. Actually, I also wanted to do it. I'll wait a little longer. At the same time, a friend saw my article on the same day, asked me in their group, and then placed an order. Let me reiterate here that I am not their agent, or after reading this article, you may believe it. But through this comparative test, it may or may not shake your desire to buy, but from my point of view, this brand's products are worth buying. On the one hand, it is a domestic entrepreneurial brand, which we deserve to support. On the other hand, judging from the results of the comparison, their technology and performance are worthy of the price. These days, I have been taking time to play with it, and I have also raised some issues that I think need to be improved with their after-sales and technical staff. I also mentioned in the previous article that I wanted to get another one from them to try. There was no reply. It doesn't matter. I will place another order. They will not not ship the goods after receiving the money. Yesterday Friday, I received a brand new TO1152. I didn't have time to play with it, so today, Saturday, I took some time to compare and test it. First of all, let me talk about why I want this TO1152, 150M bandwidth, 28M storage depth, and the key is that it has a battery. Because I think the TO202A I have now has problems, but the technician asked me to test it and communicated with me. To be honest, the current after-sales service is still very good. I also told them that I want to test it after buying it back, and they directly said that it doesn't matter, Taobao originally has a 30-day return and exchange guarantee. Okay, let me first talk about why I think there is a problem with the instrument I have. The discovery of this problem was raised by my friend who was in the group with me. I guess I was the first to place an order and the first to be shipped in this preferential group, so after I received the goods, my groupmate's goods had not been shipped yet. I sent him my test pictures, and then he asked why your frequency fluctuated so much. This reminded me, because I usually use logic analysis more, only using the concepts of 0 and 1, so for this situation, I will do a test, so this article is basically a noise floor test. To be honest, I should still be at the university stage in terms of analog electronics or oscilloscope testing, so I don’t think I can use my knowledge to test the problem of the instrument on my hand. It’s not self-deprecation, but it’s a few thousand yuan instrument. If you test it wrong, there is no need to damage others, but you may say that you think there is a problem, but you are afraid of saying it wrong, so you can just return it directly from Taobao, don’t spam here. Yes, that's right, I just want to share this brand with you and recommend it. Since I have published the first recommendation, I think it is necessary to follow up with you. My technology may not be up to standard, but I can always use their instruments to test their instruments, so this article is a comparison of spears and shields. Finally, I am going to get to the point. My problem is that the instrument has a very high background noise. I sent pictures to their technical staff. At first, they said that our power grid is relatively bad, because we are working on motor systems. This reason seems to be somewhat valid, and there is also screen interference, so I took the machine home, and the problem still exists. So today both instruments have arrived, and the two instruments are used in the same occasion. If the background noise of the two instruments is the same, then I admit that my working environment abuses the instrument. If TO1152 is perfect, then the problem is confirmed. On the right side of the picture is the TO202A with a 10-inch screen, and on the left side is the 1152 with a 7-inch screen. The screens are different, but the scale grids are visually the same, so you only need to look at the size of the waveform to see the peak in the picture later. Don't say that the waveform will be larger if the 10-inch screen is larger. In addition, for the two appearances, I prefer the TO202A, not because of the large screen, but because of the more fashionable appearance. The TO1152 may be considered portable, so it has a protection similar to a mobile phone case. It's a matter of personal preference, and this is not the technical focus.
I powered it on directly, and the after-sales service told me not to connect the test lead when measuring the background noise. OK, I won't connect it for now. In addition, in the pictures later, you may confuse the two models, but it doesn't matter. My 202A is an old version of the system, and my groupmate's machine is a new version, so my problems may be version issues. You will see in the picture that in the range switch behind CH2 channel 2, there is no "1X" or "10X" between MV and V of 202, but there is in the 1152 system. For example, the following picture is of 202A, which shows the noise floor when powered on. I don't want to say it, just count the grids yourself.
Then the picture below is of TO1152. This effect is what I think is worthy of this configuration. This also proves that this brand has this technology and performance. As a result, my 202A has a problem. The after-sales guys should agree. Careful friends will see that the peak value of the yellow line is smaller than that of the blue line, but the blue is X10, 10MV per grid, and the yellow is X1, 20MV per grid, so the results are similar. That's right, because the blue CH2 channel is connected to the test lead, so when testing the background noise, if you want a better result, then don't connect the test lead. If you do the test yourself, you understand the background noise, because this pen is also involved.
Then let's take a panoramic view, go on stage together, and see the results. The 202 on the right is 20MV per grid, and the 1152 on the left is 2MV per grid. The results are summarized by yourself.
Then for the rigor of the test, I connected the pens connected to the two screens. After connecting, the waveform of TO202A did not change much, because it was not small to begin with, and I was not in the mood to look at it. Let's take a look at T01152, which is different. From the picture, the CH1 channel is not connected to the pen, and the CH2 is connected to the pen. Do you think this has more desire to buy?
After connecting the pen, the measurement channels of the two oscilloscopes are connected together, including the alligator clamp. If you ask me why I do this, I have not read many books, and I only know how to read pictures. The picture is as follows, analyze it yourself. The right side is 202, and the left side is 1152. The line of TO1152 has become thicker. Why? Again, I don’t read much.
Seeing this, you may say that you think the performance of this 202A is very bad. Stop, stop, stop, don’t think so. Since it is a test, it must be rigorous. I said it at the beginning. I think my 202 has problems, because yesterday my group member received his 202, which is a new version, and his test results are much better than mine. As for how beautiful it is, I started to think again, should I buy a new version of TO202A back. Since I took TO1152 out for a stroll today, I will post a picture of the interface of 1152. Actually, the screen of 1152 is a little smaller, but I compared them and found that the grid size on the two screens is almost the same, about 10 mm per grid, and the number of grids in height seems to be the same. I am not good at math and I am afraid I counted it wrong. In horizontal direction, TO202 is 18, TO1152 is 14,I see that the new version interface of the group member's TO202 is similar to TO1152, and the difference is probably in function.
At this point in the article, I personally think that the content in the article has advantages and also points out some problems that may be individual machines, but I still recommend this brand. On the one hand, it is made in China, and on the other hand, it is cost-effective. Or you may think like what my friends said, you are just a local tyrant, but you can weigh this yourself. Third, I think this brand is also relatively innovative. Many of their instruments are portable, or you say that many large manufacturers have them, but tell me, which one do you think you don't feel bad about spending money on. Finally, I still have to insist. My 202A has problems. What do you think of the after-sales technology? I am still hesitating whether to get another one. Let me calm down first. Impulse is the devil. But in my heart, I still feel that I need to do a test to clarify the problem of this 202A. Okay, I will talk about it when I am sober. This content is originally created by EEWORLD forum user fsyicheng. If you want to reprint or use it for commercial purposes, you must obtain the author's consent and indicate the source
Yes, someone reminded me above that I did neglect the self-calibration step. This is a serious topic. So after seeing the reply, I immediately took out 202, powered it on, and did the self-calibration. I won’t say anything else. I felt the same. I should have seen it right, because I just got up.
During the self-check, I saw this photo and felt that I was really wrong. Such fine stripes are not ideal. Wait a minute, about 1.5 minutes later, the result is still the same.
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