Transmission electron microscopy has seven valves in the vacuum system that are driven by compressed air: the action is to drive the cylinder through the manipulation of the electromagnetic reversing valve, which in turn drives the valve to close and open. Recently, this electron microscope has a failure due to the electromagnetic reversing valve leakage and the poor contact of the air compressor power supply, causing the electronic mirror to automatically shut down during operation. The situation is as follows. Symptom: The electron mirror is automatically turned off during one operation; the compressed air pressure is insufficient on the display. Fault check and burial: Due to the fault, the compressed air pressure is insufficient. Therefore, first check the air compressor and find that the air compressor's own overload protector is activated. After the switch is reset, the instrument works normally.

However, the above-mentioned fault phenomenon occurred repeatedly on the next day, and the operating current of the air compressor was measured by a clamp meter to be 5 A, which was within the normal range value. The electronic mirror main unit was turned off, and the air compressor was repeatedly inflated and deflated. It was found that the air compressor was blocked when the pressure switch was turned on, causing the air compressor's overload protector to operate. At this time, the air compressor motor input was measured. The voltage is only 80V, and at this time, the output voltage of the air compressor power supply transformer is 95V, and the voltage drop of 15V on the power transmission circuit of the power transformer to the air compressor less than two meters is obviously abnormal. According to this, check the air plug and socket of the air compressor and find that the copper strip of the socket has black marks. At the same time, it is found that the cable connecting the power transformer to the air compressor socket has a cross-sectional area of ​​only 0.5mm2. Replace the cable with a cable with a cross-section of 2.5mm2. Replace the socket, the air compressor can not start the fault, and the compressed air pressure at the start and stop is within the normal range.

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