When you start using a transmission electron microscope, it's easy to get busy. If you run into some abnormal situations you haven't seen before, you're panicked. At this time, the most prone to the reaction, and the most erroneous reaction is to start with a trace of luck, and the more chaotic. It was a small problem and might eventually become a big problem.
The correct way is to calm down and think about each adjustment before you know what you are going to do, and then stick your hand out. If there is a problem, first check if you can judge the cause of the problem. If you feel that you are beyond your ability and can't solve it, stop and find an engineer. If you find that the state is getting more and more chaotic, but you feel that you can solve it, the best way is to return to the previous state.
In fact, the design of TEM is still very safe. The most important thing to note is that the sample should be fixed on the sample stage. When the sample stage is inserted, the vacuum is protected. This is the most dangerous place, and it is the easiest to make mistakes at the beginning. After the sample enters the electron microscope, there is no danger. The most common problem is to destroy the centering, but it will not cause physical damage to the electron microscope itself.
The consequences of TEM blind operation are mainly to destroy the alignment, and the possibility of physical damage is small. If the SEM is operated blindly, it may damage some of the probes in the sample chamber.
Daily maintenance precautions for TEM
1. Always turn on the machine and use it more, so that you can keep track of the working condition of the instrument at any time, pay attention to observe the changes of map, light, sound, vacuum, air pressure and power supply at any time, adjust it in time, make a record, and it will definitely accumulate a lot of experience after a long time. .
2. Pay attention to the air humidity , prevent the rats from splashing , the voltage should be stable, the gas should be clean and dry, and prevent small samples from falling in, especially fine particles, powder, and collision prevention.
3. Monitor whether the Freon in the electron gun is lowered, monitor whether the oil in the mechanical pump is lower than the horizontal line, and the air compressor often releases the air. The water in the circulating water device should be replaced regularly to keep the indoor humidity at 40~70%. The temperature is between 15 and 25 degrees. For the repair of electron microscopy, it is necessary to have a high level of technology. One must be interested, and the second must be savvy. It is mainly the practical ability, and the flexible use of superb comprehensive knowledge. At the same time, it depends on the accumulation of experience. People who learn electronics have the practical ability to manage electron microscopy.
4. The vacuum oil used for the rotary pump is conditionally replaced with oil once a year. The speed of oil dirty is mainly related to the cleanliness and humidity of the laboratory. The electron microscope is not open at all. It is vacuumed every day. The circuit is energized every other day or two. The school is on holiday. It is best to open two days a week, especially in the summer. The end of the summer vacation is the most common time.
Powder samples more easily see the oil becomes cloudy oil relatively deep color to see it is the time to replace! We have changed it once in 4 years, and it is said that there is still a longer time. The original oil is not very expensive more than 300 points. Still good to change.
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