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1、J I S C*2562 92 m 4933bR8 05247b7 336 m r UDC 621.31 8.1 34:681.327.66.001.4: 669.1 12.228 JIS JAPANESE INDUSTRIAL STANDARD Measuring methods for characteristics of materials of ferrite cores JIS C 2 5 6 1 - 1 9 9 2 Translated and Published by Japanese Standards Association Printed in Japan 18 S Cop
2、yright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- In the event of any doubt arising, the original Standard in J
3、apanese is to be final authority. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*:25bL 92 4933608
4、 0534769 LO9 UDC 621.318.134:681.327.66.001.4:669.112.228 JAPANESE INDUSTRIAL STANDARD J I S Measuring methods for characteristics C 2561-1992 of materials of ferrite cores 1 . Scope This Japanese Industrial Standard specifies measuring methods for the characteristics of materials of ferrite cores m
5、ainly used in electronic components with inductance. Remarks: The following Standards are cited in the Standard: JIS B 0601 Definitions and designation of surface roughness JIS B 7410 Liquid-in-glass thermometers for testing of petroleum products JIS B 7502 Micrometer callipers for external measurem
6、ent JIS B 7507 Vernier callipers JIS C 2560 General rules for ferrite cores JIS R 1602 Testing methods for elastic modulus of high performance ceramics JIS R 1610 Testing method for vickers hardness of high performance ceramics JIS R 1611 Testing methods of thermal diffusivisty, specific heat capaci
7、ty, and thermal conductivity for high performance ceramics by laser flash method JIS R 3503 Glass apparatus for chemical analysis JIS Z 8704 Electrical methods of temperature measurements 2 . Definitions For the purpose of this Standard, the principal defini- tions and symbols specified in JIS C 256
8、0 shall apply. 3. Test conditions 3.1 Standard conditions Unless otherwise specified in the detail specifi- cation, the test shall be carried out under the standard conditions shown in Table 1 . If any doubt arises on the decision based on the measured values under the standard conditions or if requ
9、ested especially the test shall be made under the conditions of 3.2. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from
10、 IHS -,-,- - J I S C*2563 92 4933608 0534770 920 2 C 2561-1992 Table 1 . Standard conditions Temperature 15OC to 35OC Air pressure 86 kPa to 106 kPa 3.2 Referee conditions The referee conditions shall be either of the grades given in Table 2 . If the grade is not specified in the detail specificatio
11、n the conditions of grade 2 in Table 2 shall be employed. I Table 2. Reference conditions Item Conditions I I Grade 1 1 Grade 2 Temperature 1C 123C - + 2 O C Relative humidity I 48 % to 52 % 145 % to 55 % Air pressure 86 kPa to 106 kPa 4. Specimens for test are shown in Fig. 1 . The shapes and dimen
12、sions (nominal values) of specimens used Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- Fig. 1 . Specimen
13、s ( 2 ) o a J O O C u .li Remarks 1 . The calculation formulae of core factors of specimens (i) to (3) are as follows: 2n Cl i 2 log,- e - c, A - c, = Tn Unit: mm (31 o h 3 C 2561-1992 Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, U
14、ser=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- _ _ _ JIS CS2561 92 M 4933608 051q772 7T3 M 4 C 2561-1992 2. The core factors of specimens (1) to (3) are shown below. Ci (mm-l) C,(mm+) ,(mm2) (mrn) ve(mm3) Specimen (i): 1
15、.538 2.455 x 10-2 62.63 96.29 6 030 Specimen (2): 2.460 1.006 x 10-1 24.46 60.18 1472 Specimen (3): 6.150 1.571 3.914 24.07 94.22 5 . Electrical, magnetic and physical characteristic tests Remarks: Unless otherwise stated, the voltage applied to the specimen shall be sinusoidal in electrical and mag
16、netic tests. 5.1 Permeability Remarks: Various permeabilities except permeability of vacuum shall be expressed in relative permeability. 5 * l e l Initial Dermeabilitv (1) Device and apparatus The testing device and apparatus used for the measurement shall be calibrated previously, shall have suffic
17、ient accuracy and the circuits shall be as given in Fig. 2 to Fig. 5 . Fig. 2. Maxwell bridge Fig. 3. LCR meter Under 40 M H z Under 100 M H z IAl i., i., z , =- = R, + jwL, = I i, I eje 1 i, I sin6 L= R,= I 2, I cos6 K/,=50.x I Copyright Japanese Standards Association Provided by IHS under license
18、with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- Fig. 4 . Q meter 7 7 b At resonance Q=- v 2 Vl wLxC,=l 5 C 2561-1992 Fig. 5 . Network analyzer i Mixer Reference signal Lx Rx 1F
19、.Measurement specimen (a) Winding type measuring method Choose the specimens from those given in Fig. 1 . (1) to (3) and uniformly wind an insulated wire over all the periphery of specimen. Select the pitch adequately so that the effect of distributed capacity is avoided. When the measurement is mad
20、e at a high temperature, use a heat resistant insulated wire, or apply a heat resistant insulating tape to the specimen. (b) Short-circuit coaxial method The specimen shall be that of Fig. 1 (3). Preconditioning measurements. Use a.c. neutralization or thermal neutralization as the neutralizing meth
21、od. measured values, the neutralization may be omitted. Neutralize the specimen before electro-magnetic If there is no possibility of influence on the Test methods and calculation (a) Winding type measuring method Measure the self inductance of specimen with the Maxwell bridge or LCR meter shown in
22、Fig. 2 or Fig. 3, and calculate the initial permeabilityp:, from the formula below. The strength of measuring magnetic field shall be as given in Table 3. Record the measuring frequency on the measurement record additionally. where, Ie : effective magnetic path length of specimen actually measured (
23、m) I, : self inductance of specimen (H) po : permeability of vacuum 4 n x (H/m) 1% : effective cross-sectional area of specimen actually measured (m2 X : number of turns of specimen coil Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001,
24、 User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S Cw25bl 92 4933608 O534774 576 = 6 C 2561-1992 (b) Short-circuit coaxial type measuring method Measure the self inductance of short-circuit coaxial tube shown in Fig.
25、 6 before insertion of specimen and that after insertion of specimen, by means of the LCR meter or network analyzer shown in Fig. 3 or Fig. 5, obtain the difference in the inductances so measured and calculate the initial permeabilitypi, from the formula given below. The strength of measuring magnet
26、ic field shall be as given in Table 3. Record the measuring frequency on the measurement record additionally. Fig. 6. Example of short-circuit coaxial tube n Specimen “Measuring terminals where, A L : difference in self inductances before and after insertion of specimen (H) l e : effective magnetic
27、path length of specimen actually measured (m) PO : permeability of vacuum 4 z x (H/m) A, : effective cross-sectional area of specimen actually measured (m2) Table 3. Magnetic field for measuring initial permeability Classification Measuring magnetic field A/m Material with general P (IC, (A) A R : c
28、hange in effective resistance when the current increase from current Il (+I to current (4) (QI Note (4) The current 1; and current Iz shall be in r . m . s . value. 5 . 5 Curie temperature (1) Device and apparatus As specified in 5 . 1 . 1 ( 1 ) . (2) Measurement specimen As specified in 5.1.1 ( 2 )
29、 . (3) Preconditioning As specified in 5.1.1 (3). ( 4 ) Test method and calculation Place the specimen in the thermostatic chamber, maintain it at each temperature until it sufficiently stabilizes, and then measure the initial permeability rui according to 5 . 1 . 1 . Prepare the relationship betwee
30、n the initial permeability and the temperature as illustrated in Fig. 10, draw a straight line which passes through a point equal to 80 X of the maximum value and a point equal to 20 % in the fallen region of the initial permeability beyond its maximum value, obtain the point of intersection of the
31、extension of the above straight line and a line of P I = 1, and take the temperature at this point as the Curie temperature T,. The measuring frequency shall be 1 kHz. T ( O C ) Curie temperature T= Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees
32、/1111111001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- 16 C 2561-1992 5 . 6 Disaccommodation factor (1) Device and apparatus As specified in 5 . 1 . 1 (1). (2) Measurement specimen As specified in 5 . 1 . 1 (2). (3
33、) Preconditioning As specified in 5.1.1 (3). (4) Test method and calculation Measure the inductance I, after tl hours under a prescribed temperature from complete neutralization, and the inductance L after f hours and calculate the disaccommodation factor DI: from the formula given below. The tl and
34、 f may be selected optionally, but in general it is selected in one decade unit such as 1 min and 10 min, 10 min and 100 min, etc. when the time is within 1 min. during the measurement are - + 0.2OC. The accuracy on time shall be + 1 X in general, but + 2 . 5 % Tolerances on ambient temperature The
35、measuring magnetic field strength shall be as given in Table 3. Record the measuring frequency on the measurement record additionally. where, MI : initial permeability at inductance L.1 (H) AZ : initial permeability at inductance L2 (H) fl, f : elapse of time from complete neutralization to measurem
36、ents (provided f tl 1 Calculate the initial permeability according to 5 . 1 . 1 ( 4 ) . 5 . 7 D . C . magnetic characteristics (1) Device and apparatus A recording magnetic flux meter previously calibrated having sufficient accuracy shall be used. In the recording magnetic flux meter, there are M in
37、tegrating system which employs a mutual inductor and CR integrating system which employs a capacitor and a resistor. The principle diagrams for both systems are given in Fig. 11 and Fig. 12. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111
38、001, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- J I S C*Z563 92 m 4933608 0534785 353 m Fig. 1 1 . Measurement principle (M integrating system) - A : density of water at the test (kg/m3 Mass of dry specimen thermost
39、atic chamber regulated at 105C to 12OoC, take it out of Sufficiently dry the specimen in the the thermostatic chamber, place it in a desiccator and cool it to the room temperature, then measure the mass with a balance and take the mass so measured as the mass of dry specimen tn,. Water saturation me
40、thod 1 specimen into a dried beaker, and place the beaker in the yacuum container. Maintain the beaker at a vacuum of 2 to 3 x 10 Pa for 5 min. located in the vacuum container. immerse the specimen completely. Place the dried and constant weighted After the above procedure, put water into the beaker
41、 Introduce enough water to After enough immersion into water, vacuum the container for a further 5 min, and return the pressure in the container to atmospheric pressure by introducing air. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/111111100
42、1, User=Wing, Bernie Not for Resale, 03/13/2007 20:00:00 MDTNo reproduction or networking permitted without license from IHS -,-,- JIS C*25bL 92 W q933b 05L479b 137 W 28 C 2561-1992 Water saturation method 2 Place the dried and constant weighted specimen into a beaker containing water, and boil it.
43、procedure the amount of water shall be enough t o immerse the specimen completely . In this Prepare a w i r e gauze about 1 c m above the bottom of the beaker. circulates sufficiently. Place the specimen on this wire gauze so that the water The duration of boiling shall be 30 min. Mass of water satu
44、rated specimen i n water saturated specimen with a suspension wire, put the specimen into water and measure the mass. suspension w i r e only into water, subtract the latter mass from the former mass t o obtain the mass of water saturated specimen i n water 1712. Record the temperature of water i n
45、this procedure. Suspend the water Then measure the mass by putting the Mass of w a t e r saturated mecimen Take out the water saturated specimen from the water, wipe off water drops on the surface quickly with wet gauze(61, measure the mass and take it as the mass of water saturated specimen m3. Not
46、e ( 6 ) Soak the gauze so that it contains sufficient w a t e r , squeeze it just enough t o remove water drops on the specimen surface and then use it. 5.11.2 Method bv Daraffin imDrennated mecimen (1) Device and apparatus The device and apparatus shall be as follows: (a) Thermostatic chamber A cha
47、mber which can control the temperature inside the chamber at 105C t o 120C. (b) Balance A balance with a reciprocal sensibility 1 m g or better. (c) Paraffin (d) Suspension w i r e A w i r e which has sufficient strength t o suspend the specimen and which causes a negligible error i n the measuremen
48、t due t o the change i n volume of the wire immersed into water. (e) Thermometer The alcohol thermometer with minimum graduation of l0C specified in JIS B 7410. (2) Measurement specimen The measurement specimen shall have a mass of 5 g or more and shall be free from f l a w s and cracks. (3) Preconditioning Not carried out. ( 4 ) T e s t method and calculation Measure the mass of dry specimen, the mass of paraffin impre