How to identify the two-piece magnetic ring material:

First, the soft ferrite core: made of nickel zinc, manganese zinc material, used in high-frequency inductors, transformers, filters, etc., is the most commonly used radio materials. (Black / white), (blue / yellow) or (green / blue), (gray / yellow), the color of the iron core can be quickly identified according to the color or characteristics of the surface of the coating. Carbon black iron paint color: (all yellow) or (blue / white) high magnetic flux paint color: (blue) iron nickel molybdenum paint color: (all gray), (varnish) Color is: (all black) nickel-zinc ferrite (NXO) is not painted the surface rough, easy to powder, the color of gray manganese zinc ferrite (MXO) is not painted the surface is more smooth, easy to powder, color Deep amorphous nanocrystalline alloy coated with full red, full blue, all white and other colors, and the coating is significantly different.

Second, the ferrite magnetic ring permeability measurement:

1, measuring the outer diameter of the magnetic ring D, diameter d, ring height H, unit mm.

2, with the enameled wire to wear around 10 to 20 laps, around the point, not too loose, measure the amount of inductance L, the unit uH, inductance measurement error is small, the inductance of small measurement error will be large, according to actual needs Determine the number of turns around N.

3, the above data into the following formula to calculate the approximate permeability u0 u0 = 2500 * L * (D + d) / ((Dd) * H * N * N) For example: 13X7X5 magnetic ring, (13 + 7) / ((13-7) * 5 * 20 * 20) = 1150000/12000 = 95.8 The result of the calculation and the specification of the magnetic permeability 100 are calculated as follows: u0 = 2500 * 23 * (13 + 7) The closest to determine the magnetic ring u0 is 100, pay attention to the general u0 nominal error of + -10%. For the absence of parameters of the magnetic ring can be based on the appearance of the initial characteristics of the initial judge which material, and then calculate the permeability, you can determine the main specifications of the magnetic ring.

Third, how to distinguish between manganese zinc or nickel-zinc ferrite MnZn ferrite MXO and nickel-zinc ferrite NXO is the production of soft ferrite in the most species, the most widely used two series of core components. We know that for the TV set for the output transformer U-shaped core, deflection core, as well as the transformer E-shaped core, are generally made of manganese zinc ferrite material. For the magnetic antenna in the radio, there are manganese zinc also nickel zinc, but can be different from the stick to different colors. For example, some factories in the manganese zinc wave rods sprayed with black paint, in the nickel-zinc short-wave bar at the end of the spray with a large red paint. In addition, a variety of ring core also have manganese zinc, nickel zinc points. But encountered a smaller thread-shaped, cylindrical, shape and cap-shaped core, and some made of manganese zinc material, and some made of nickel-zinc material, and no core color on the core, when these When the core is mixed together, how to distinguish it? Here are two specific methods.

(A), visual method: MnZn ferrite MXO as a result of the general permeability μ is relatively high, larger grain, the structure is also relatively close, often black. The nickel-zinc ferrite NXO general permeability μ is relatively low, fine and small grain, and porous structure, often brown, especially in the production process is relatively low sintering temperature is particularly prominent. According to these characteristics, we can use visual method to distinguish. 1, in the light of the bright place, if you see the ferrite color black, there are more bright bright crystal, the core is manganese zinc ferrite; if you see the ferrite with brown, shiny dim, crystal Grain is not dazzling, this core is nickel-zinc ferrite. Visual method is a relatively rough method, after some practice can also be grasped. Visual method is best to prepare an ordinary magnifying glass, if there are several components on the better, in order to compare. In the case of bright daylight, with a magnifying glass to observe, if the ferrite with brown, and shiny dim; grain is not bright, then the magnetic element is nickel zinc ferrite. If you see the ferrite color black, there are more bright bright crystal, then the magnetic components for the manganese zinc ferrite. If several components of the same species, can not distinguish, you can with the home radio in the wave of magnetic comparison, it is easy to distinguish. It is noteworthy that this method is not difficult to distinguish in the light, the best day to observe in the outdoors. 2, water mill According to the principle of visual method, MnZn ferrite was black, nickel-zinc ferrite in the brown, you can use water mill to identify. Method is to put a magnetic surface of the magnetic components on more than 200 fine grinding wheel or grinding stone on the ground a few times, and then according to the grinding out of the water powder to judge. Judgment method with the visual method, that is, black powder for the manganin ferrite, and gouache brown brown nickel ferrite;

(B), test method: This method is more reliable, but requires some test equipment, such as high resistance meter, high frequency Q table and so on.

1, the use of manganese zinc and nickel-zinc ferrite resistivity ρ different to distinguish. As the resistivity of MnZn ferrite is relatively low, about 103Ω · cm below, while the nickel-zinc ferrite has a high resistivity of about 105 ~ 108Ω · cm. So, we can use a high resistance meter or any other instrument that can measure the resistivity. Before the test, to make two arbitrary position on the core of the electrode, in order to test a convenient, optional thread, cylindrical, working core two cylindrical end of the electrode, cap-shaped core can be selected in the same circular plane for two An electrode, then, with sand skin gently grinding the core of the site to be tested oxide layer, and then coated with a good conductive material as a test electrode, generally available 6B pencil painted two graphite electrodes, made cylindrical core, Cap-shaped magnetic core shown in the graphite electrode, measured DC voltage in the tens of volts or more when the resistivity. After making two graphite electrodes, can also be used 500-type multimeter (range selector switch can be placed in 10K file) measured core resistance to distinguish between manganese zinc or nickel zinc ferrite. General resistance below 150KΩ is manganese zinc; resistance is quite large, multimeter table head pointer is basically not moving nickel zinc ferrite.

2, we can also use the manganese zinc and nickel zinc ferrite use frequency f to distinguish. As the use of MnZn ferrite material frequency is generally below 2 MHz, its Q value is low; and nickel zinc ferrite use frequency of 2 ~ 200MHz, its Q value is higher. We can use the existing high-frequency coil, such as shown in Figure 3 (requires this coil does not install the core, the inductance is less than 20μH), first remove the core, and then to test the ferrite core were loaded, In the QBG-3 high-frequency Q table or other instruments with the same accuracy Q value, Q value of the high nickel-zinc; Q low (generally several times lower) is manganese zinc. If the above methods are used at the same time, the judgment is even more correct. At present, some factories in order to reduce costs to magnesium zinc on behalf of nickel zinc, magnesium zinc also applies high frequency, so whether visual or test the high-frequency core components may not be nickel zinc, but magnesium zinc ferrite, which A little draw attention.

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