Anti-magnetic watch does not mean that all parts of the watch are anti-magnetic, just refers to some of the main parts, such as balance wheel, hairspring, winding, etc. are made of anti-magnetic materials. According to international standards, if the table in the 4800A / m magnetic field can continue to run, and test the day after the maximum error of not more than 30 seconds to meet the anti-magnetic standards. Although the anti-magnetic watch has more and more practical value, but some “ultimate anti-magnetic” watch, in fact, has been far more than the need to prevent the daily magnetic field, they have become the ultimate pursuit of the ultimate table fans ” The
Standard for anti – magnetic watches
When the watch accidentally in the magnetic field with a strength of 4800A / m, the residual effect of the quartz watch does not exceed 1.5 seconds, the mechanical male watch (movement area greater than 314 square millimeters) residual effect of not more than 30 seconds, mechanical female table residual Cartier love bracelet replica effect does not exceed 45 Sec, such a table can be called anti-magnetic watch.
The birth of anti-magnetic watch
Mechanical parts inside the metal parts are easy to take the magnetic, magnetized after the movement of gossamer adhesion, resulting in effective bounce radius reduction, the table will suddenly go fast, which is often caused by the cause of the failure. Before and after World War II, the use of more and more frequent electrical appliances, watches are increasingly susceptible to the impact of electromagnetic. Bear the brunt of the pilots, senders and mechanical and electrical engineers, they must be in a small space for a long time close contact with electromagnetic objects, watch the hairspring magnetization phenomenon is inevitable. Modern society in the electromagnetic field from the eyes of the charger, to a variety of audio, television, microwave ovens, refrigerators, etc., have different sizes of electromagnetic radiation, will affect the normal timing of the watch.
IWC in the 1930s when the development of aviation table is a good solution to this problem, in the history of the history set a great success. The original anti-magnetic method using soft iron made of the case, anti-magnet sleeve to increase the thickness of the movement, equipped with a soft magnetic shield after the movement can withstand 80000A / m strong magnetic field, reducing the possibility of mechanical parts , Of course, both of the table also has a double protection. Later, more thoroughly, simply switch to non-magnetic materials to manufacture parts.
Which watches are susceptible to magnetic
First of all, antique table in particular to pay attention to anti-magnetic, as well as the assembly of antique movement of the table, their materials are not produced in accordance with modern technology, anti-magnetic performance is weak.
Second, the ultra-thin table is easy to be magnetized. Because the ultra-small movement space is small, conventional anti-magnetic measures (such as through a thick case to block the magnetic field) is difficult to implement.
In addition, the mechanical watch in the modern life of the opportunity to contact the magnetic field Cartier love ring replica more and more, the intensity is also growing. Put aside the impact on the accuracy of walking do not say, for a long time to watch in a strong magnetic environment on the movement of the injury is not small. High-end watches to occupy the absolute dominance of mechanical movement, if even the operation can not guarantee the accuracy, then any other function is only superfluous.
Basic knowledge of antiques
1) watch anti-magnetic specifications
Japanese watch: usually do not mark the magnetic, marked with ordinary anti-magnetic and marked with anti-magnetic 3.
Non-standard magnetic resistance: can withstand 1600A / m magnetic field (equivalent to 20 Gauss).
Ordinary anti-magnetic (graphics for the inverted ‘U’ plus a horizontal below): to withstand 4800A / m magnetic field (equivalent to 60 Gauss).
Strengthen the anti-magnetic (graphics for the inverted ‘U’ below plus two horizontal): to resist 16000A / m magnetic field (equivalent to 200 Gauss).
Speaking of magnetic your brother, you have to mention the Rolex MILGAUSS watch, the watch with its own special rare earth Parachrom nickel cobalt blue steel gossamer, with almost no opening of the fully sealed anti-magnetic soft iron cover, the anti-magnetic function to 100000A / m degree, called anti-magnetic watch model.
2) attenuation of the magnetic field with distance
The intensity of the magnetic field is inversely proportional to the second power of the distance, and as the distance increases, the magnetic field is sharply attenuated.
Ordinary anti-magnetic watch, as long as the above 5cm above the material is safe enough. Even if it is not marked with anti-magnetic watch, as long as the farther away (10cm or more) on the line. Daily life, as long as a little attention, you can avoid the magnetic field of the harm to the watch, no need to talk about magnetic changes.
3) Examples of ordinary magnetic objects
Mobile phone, telephone handset, computer, razor, radio, bag of magnetic buckle, refrigerator door, induction Cartier nail bracelet replica cooker, magnetic bracelet, magnetic pillow and so on.
Mechanical watch by the magnetic hazards
The travel time of the mechanical watch is controlled by the hairspring and the balance wheel. When the watch is magnetized, the magnetic force changes the swing frequency of the balance wheel, so the speed of the gear system changes, the watch goes mad. After the magnetic, the watch may stop, slow, or fast. Symptoms of light, the daily error of tens of seconds. Severe, the number of errors on the number of points. Watch by the magnetic, the magnetic will not recede their own, need to be demagnetized repair to return to normal.
Diagnosis of the watch by magnetic method
Always suspected of their own watch is non-magnetic, will seriously affect people’s spiritual peace, here to introduce a simple way to diagnose the watch by magnetic: to the stall to buy a compass, the watch near the compass, if the compass is very powerful deflect , That watch is subject to the magnetic. Even if the watch is not affected by the magnetic, because the watch itself is made of steel, so when the watch near the compass, the compass will be micro-movement, but the degree of deflection is very small.
This method can also be used to detect the presence of a magnetic field where the watch is kept. The compass to keep the watch place, if the compass deflection, there are suspicious near the magnetic objects. Home of the steel material tools, such as vise, etc., often in the unconscious when close to the magnetic material and by the magnetic. Watch the place should also take away such a magnetic tool.
How does the mechanical watch prevent magnetism
1) do not open the back cover, so as not to dust, fiber, water vapor and other invading table machine, affecting the normal travel time;
2) must be timed on the clock every day, the timail on the foot so that the watch can keep the timings of the accuracy;
3) pull the handle can be dial, inverted dial can be, after the need to push the handle to the top of the position, otherwise it will cause the table to stop;
4) should always wipe the watch shell, keep clean. Watches, if not, should be placed in a dry, no mothballs where, every time to a winding, to prevent the oil coagulation, affecting the travel time;
5) in the strenuous exercise or vibration of the larger circumstances, should remove the watch, so as to avoid bad parts;
6) waterproof table in general to prevent the intrusion of water vapor in the air, not absolutely not into the water, do not wear a table swimming, shower, hand washing, washing clothes should also pay attention;
7) Although the watch has a certain anti-magnetic properties, but still need to avoid contact with the strong magnetic field to prevent the magnetization of parts, causing the table to move when the change;
8) do not make the watch and acid, alkali, salt and other corrosive liquids and gas contact, a long time sweat erosion will make the case rust, summer use the watch, the best pad with a pad pad separated;
9) watches have a certain speed error, as long as the error does not exceed the standard, do not often dial the speed needle;
10) If you do not understand the repair technology, do not arbitrarily dial the table parts or refueling, so as to avoid accidental loss.