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Anti-magnetic
Mechanical watch travel time by the gossamer and balance wheel control. After the watch by the magnetic, the magnetic makes the swing frequency of the balance changes, so the speed of the gear system will change, watch go crazy. After the magnetic, the watch may stop, slow, or fast. Light symptoms, the error of tens of seconds. Severe, the daily error of several points. After the watch by the magnetic, its magnetic will not recede, the need for degaussing repair to return to normal. Before and after World War II, the use of electrical appliances more frequently, watches are also increasingly vulnerable to electromagnetic effects. Bear the brunt of the pilots, senders and mechanical and electrical engineers, they must be in close contact with a small space for a long time with electromagnetic items, the watch's hairspring magnetization is inevitable. In modern society, electromagnetic fields range from chargers that are widely used to various types of audio, television sets, microwave ovens and refrigerators, all of which have different sizes of electromagnetic radiation and affect the normal timing of the watch. IWC in the thirties of the 20th century to develop aviation watch when a good solution to this problem. The original method of using anti-magnetic soft iron inner case, anti-magnet sleeve to increase the thickness of the movement, equipped with anti-magnetic soft iron movement after the core can resist the 80000A / m strong magnetic field and reduce the possibility of mechanical magnetization , Of course, also have a dual protection of the table. Later, more thorough, simply use non-magnetic materials to manufacture parts. Anti-magnetic watch does not mean that all parts of the watch are anti-magnetic, just refers to some of the major components, such as balance, hairspring, clockwork, etc. are made of anti-magnetic material. According to international standards, if the table in 4800A / m magnetic field can continue to run, and the maximum error of the day after the test does not exceed 30 seconds to meet the anti-magnetic standard. Quartz watch in the day after the test the maximum error of not more than 1.5 seconds, then this table will be regarded as anti-magnetic watch can be marked. Mechanical methods of anti-magnetic 1. Do not open the back cover, so as to avoid dust, fiber, water vapor and other invade the machine, affecting the watch's normal travel time; 2. Must be on time every day winding, timing on the foot winding watch can keep timekeeping Accuracy; 3. Pull out the handle can be allocated to the needle, dial-up can be allocated to dial, dial needle after the head will be pushed onto the position, otherwise it will cause the watch machine stopped; 4. Should always rub the watch case ,keep clean. Watch if not, should be placed in a dry, no mothballs place, from time to time on a winding, to prevent the solidification of lubricating oil, affecting the travel time; 5. In the case of strenuous exercise or vibration, the watch should pick Under the case, so as not to damage the mechanical parts; 6. Waterproof table under normal circumstances to prevent air intrusion of water vapor, not absolutely not into the water, not to wear table swimming, showering, hand washing, washing clothes should also be noted; Although the watch has a certain anti-magnetic properties, but still need to avoid contact with the strong magnetic field to prevent parts magnetization, causing the watch machine travel time changes; 8. Do not make watches with acid, alkali, salt and other corrosive liquids and gases contact for a long time Sweat erosion will make the case rust, the summer watch, it is best to use cushion pad separated from the arm; 9. watches have a certain speed error, as long as the error does not exceed the standard, do not often turn the speed needle; 10. If you do not understand the repair techniques, do not arbitrarily dial the table parts or refueling, so as to avoid accidental damage.