Siheyuan: Starting from a fitter

Chapter 122 Multimeter ([-])
The principle of the multimeter is very simple. It can measure resistance value, DC voltage, DC current, AC voltage, AC current and other electrical signals. As for other measurement contents, conditions do not allow it and it is not designed for the time being.

Li Guocheng changed to a blank piece of paper, picked up a pencil and began to sketch, completing the schematic design in a short while.At this moment, Yan Jiefang walked in with a lunch box.

"Brother Li, I see that you have been explaining to us that you don't have time to eat, so I brought you food." Yan Jiefang smiled honestly.

Li Guocheng became more and more satisfied with Yan Jiecheng's foresight.We have known each other since childhood and have no major problems. As long as he is willing and can keep up, Li Guocheng doesn't mind giving him a hand.

"how much is it?"

"Brother Li, no need, I invite you," Yan Jiefang said shyly, but looked at Li Guocheng who was staring at him, and he was very clever.

Li Guocheng handed him the money ticket and said, "Thank you, go back quickly and work hard in the future."

When Yan Jiefang was first transferred to the laboratory, he was very happy, thinking that he would be able to prosper from now on, but he did not expect that he would be disastrous as soon as he arrived.Li Guocheng arranged work for everyone, but ignored him.At that time, he didn't know how he got home.

After that, I never saw Li Guocheng again, but I finally saw him today.He approached cautiously, but he didn't expect that Li Guocheng would treat him normally as before. Only then did he feel relieved.

In fact, what he did before was intentional by Li Guocheng, just to test him.After all, he has been influenced by the third uncle since he was a child, and he is afraid that he will not be able to handle the big and small kings, and he will pretend to be powerful in the laboratory, which will not lead to good results.

When I heard about his performance, I felt much more at ease and felt that I could continue to train him.

After everyone left, Li Guocheng drank a cup of hot tea. The tea was brought from Mr. Yuan.

First, scan the components on the workbench to form a three-dimensional model in my mind.Then sit on the chair and pose as Ge You lying down.At this time, the circuit diagram I just drew is in my mind.

All components were replaced with three-dimensional models. After checking that there were no problems, the layout began. The purpose was to reduce the area of ​​the circuit board as much as possible while meeting the electrical requirements.

After placing it repeatedly, half an hour later, looking at the final version in my mind, Li Guocheng is so beautiful.Since graduation, it has been a long time since I designed a circuit.

The last step is wiring, which is to link all the devices according to the circuit diagram.Since there is no circuit board yet, the device can only be fixed on the insulating substrate, and then connected with enameled wire.

In order to make the connection more beautiful and prevent short circuit, Li Guocheng spent another hour simulating the connection in his mind.

After all the preparatory work was completed, Li Guocheng took an epoxy resin board, cut it to the size in his mind with a carving knife, and made precise holes according to the position of the device in his mind. With Li Guocheng's hand strength and stability, all the holes were completely Replicate the layout in your mind.

Insert the devices into the substrate in turn, fix them with glue, and connect them one by one according to the three-dimensional wiring diagram. The routing direction and position of the enameled wires are completely consistent with the three-dimensional diagram in your mind.

After the soldering of the circuit board was completed, it was checked again, and there was no problem, so it was put aside.

I took out a piece of red sandalwood from the secret realm and started carving. The entire shape completely reproduced the classic Fluke multimeter of later generations.Even the surface knobs are copied exactly.

Looking at the final product, Li Guocheng's inner bad taste seemed to be released.

Installed two batteries and calibrated using the suitcase-sized voltmeter.In fact, the accuracy of this old-fashioned voltmeter is not accurate.No matter, now the first multimeter he made is the benchmark.

Based on the voltage scale and using Ohm's law, the values ​​of current and resistance are calculated, and the calibration of all measurement types is completed.

Fasten the back cover and look at the multimeter with modern industrial aesthetics in your hand. I dare not say that it is the first real multimeter in the world, but it must be the most beautiful multimeter.

I admired the multimeter for a while and put it aside.

Come to the drawing board and put the drawing just now in the drawer.Take out a radio circuit diagram from the secret laboratory,

Using the same method, first form a three-dimensional model in the mind, because the radio signals are easy to interfere with each other, so this time I used the method of wiring while laying out. Because of the experience of the multimeter, the model construction was very smooth.

After completing the three-dimensional construction of the entire circuit diagram, Li Guocheng felt a pain in his head and knew that his telepathy had been completely exhausted.

He took out a wooden folding bed from the secret realm, put it on the quilt he brought from home, and lay down to sleep.

The next morning, Li Guocheng woke up automatically before 6 o'clock. It was indeed a deep sleep. In one night, all his mental power was restored.

Check that the door has been inserted, walk into a hidden corner, enter the secret realm, and complete your daily practice.

I got up too early, and the breakfast in the cafeteria was not ready yet. I just continued to check the three-dimensional model of the radio, corrected several unreasonable layouts and connections, and completed the drilling of the substrate before 7:[-].

Carefully cleaned up the crumbs on the workbench and clothes, and walked to the cafeteria with the lunch box.

A millet porridge, a corn bread, a pickle, a simple breakfast.

Back in the laboratory, everyone came to the laboratory one after another. As soon as they entered the first assembly laboratory, they found Zhou Xiaojuan and Zhang Zhijing playing with multimeters with great interest.

"Oh, you two girls, please be careful, that is a precious thing, the only one in the world." Li Guocheng deliberately shouted loudly, which scared Zhou Xiaojuan's hand and caused her multimeter to drop.

At this time, Li Guocheng's heart tightened. When he thought that the multimeter with special significance was about to be scrapped, Zhang Zhijing stretched out his magical hands and caught it steadily.

All three of them breathed a sigh of relief, and a certain woman patted her chest habitually. Li Guocheng was so upright that it was useless to look at her.

"You two, hurry up and go about your own business, don't worry about my things," Li Guocheng said sincerely.

Zhou Xiaojuan didn't have any eyesight, so she took the multimeter from Zhou Xiaojuan's hand, turned her left and right hands together, and looked at Li Guocheng very worried.

"Director, what do you think this is? Is it very precious?" It seems very casual on the surface, but in fact it is very careful.

"It's a multimeter, much more powerful than that voltmeter. It's portable and can last for a year with two batteries." Even as a soul in his 40s, Li Guocheng was filled with pride and urgently needed to share his masterpieces for later generations.

"So precious", I didn't understand it before, thinking it was just a work of art.But when she heard that it was more advanced than the voltmeter, she felt a little numb. She knew how much the technical department valued that bulky voltmeter.No matter how careless she is usually, she has a blind awe of technological products.

She carefully put the multimeter in her hand on the workbench. Her heart relaxed and her legs softened. If Zhao Zhijing hadn't been quick with her eyesight and quick hands, she would have sat down on the ground.

Li Guocheng, who felt that he had played a little too much, walked to the workbench, picked up the multimeter, and said, "It's okay. If it's broken, I'll make another one." After that, he handed it to Zhou Xiaojuan casually.

She was so frightened that she waved her hands again and again, and Li Guocheng was helpless. He must have thrown the multimeter on the ground just to prove it.

After explaining the functions of the multimeter to them and satisfying their curiosity, the laboratory became quiet again.

But Li Guocheng forgot to tell them, and before noon, an exciting news spread throughout the steel rolling mill.

"Did you know? The laboratory has developed a magical tool that foreigners don't have."

"What an artifact, that is high technology, a high technology more advanced than semiconductors."

"Oh my God, how much does that cost? Can I earn foreign exchange?"

"That's not possible. How can the high technology we finally developed be used by foreign devils?"

"Yes, only the socialist camp can use it, capitalism is not qualified."

. . . . . .

In the morning, Section Chief Wu of the Technology Department contacted Wu Liankui by phone and asked what kind of high technology the laboratory had developed. Wu Liankui, who had just woken up from a hangover, was confused and denied it.

After answering a few more calls, Wu Liankui realized something was wrong.When I walked out of the office, I happened to meet Zhou Xiaojuan. After I understood what was going on, I hurried to the first assembly laboratory to confirm the situation with Li Guocheng.

After some introductions, Wu Liankuile ​​was indifferent and hurried to Li Huaide to report the great news.

As the person involved, Li Guocheng was just a little excited at first. When Wu Liankui came to find him, he was already calm. Because he had seen too many real high-tech products, he didn't care much about the simple analog multimeter.

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(End of this chapter)