GB/T 11437-1989 Sectional specification for ferrite cores for broadcast receiver antennas (for certification purposes) GB/T11437-1989 Standard download decompression password: www.bzxz.net

1 Scope
National Standard of the People's Republic of China
Ferrite cores used in broadcast receiver antennas
Sectfonal specification
(For certification)
GB 11437-89
This specification specifies the quality assessment procedures and quality consistency inspection requirements for ferrite cores used in broadcast receiver antennas (hereinafter referred to as "cores").
This specification is applicable to cores with circular or rectangular cross-sections. This specification is derived from the general specification GB9623IEC723-1) Communication transducer and transformer cores Part 1: General specification" and the basic standards GB9635 (IEC492) "Measuring methods for antenna rods", GB9636 (IEC223) "Dimensions of magnetic oxide circular antenna rods and fan antenna rods", SJ/Z 9001.1 (IEC 68-1) and other test methods suitable for use in detailed specifications. Detailed specifications should be prepared in accordance with this specification and should comply with the provisions of the corresponding blank detailed specifications. The measurement conditions, measurement equipment and monitoring measures to be followed by the relevant measurement methods should be specified in the detailed specifications. 2 General provisions
2.1 Relevant standards
GB9623 (IEC723-1) Communication inductors and transformer cores Part 1: General specifications GB11439 (IEC367-2) Communication inductors and transformer cores Part 1: Guidelines for drafting performance specifications GB9636 (IEC223) Dimensions of magnetic oxide circular antenna rods and flat antenna rods GB 9635 (IEC 4192)
GB 9634 (IFC 424)
S1/Z 9G07 (IEC 410)
SJ/7.9006 (IFC 419)
Methods for measuring antenna drop
Guide to limit specifications for external defects of components made of magnetic oxides
Guide to batch inspection and periodic inspection in specifications for electronic components (or parts) SJ/Z 9001. 1 (IEC 68--1)
Basic environmental testing procedures Part 1: General SJ/Z 9001. 2 (IEC 68-2-1)1
Part 2: Various tests Test A, low temperature Test B: dry heat
SI/Z 9001.3 (IFC 68-—2-2)
SJ/Z9001.5 (IEC68-2-5) Test Ca, steady-state damp heat SJ/Z9001.4 (1EC68-2-14) Test N: temperature change SJ/Z 9001.7 (IEC 68-2—13) Test M: Low pressure SJ1582 Ferrite magnetic material brand and part model naming method 2.2 Units, derivatives and terms
Units, graphic symbols, text symbols and terms should be in accordance with the provisions of GB9623 (IEC 723—1). Approved by the Ministry of Machinery and Electronics Industry of the People's Republic of China on March 20, 1989 and implemented on March 1, 1990
GB 11437B9
Supplementary units, symbols and terms can be found in GB9636 (IEC223) and GB9635 (IEC492). 2.3 Classification
Magnetic cores should be classified according to their general characteristics and combined with shape, specifications and the use rate range of magnetic core materials. 2.3.1 Shape
AY, — round antenna core,
A—— fan-shaped large wire core.
2.3.2 Specifications
a. Round antenna core dx!
d—diameter, mm,
1—length, mm.
. Fan wire core: tx×
t—thickness, mm,
6—width, mm:
t—length, mm.
2.3.3 The category or grade of core material
according to the provisions of SJ1582, such as R60.R100.R400.2.4 Size
The size of the core shall comply with the provisions of GB96361EC223). 2.5 Core parameters
The detailed specifications shall be in accordance with the requirements of GB9635 (JEC492) and GB9636 (IEC223), and shall specify the requirements and parameter values ​​of the electrical and mechanical characteristics of the core.
3 Quality Assessment Procedure
3.1 Composition of Inspection Lots
The composition of inspection lots and the appraisal approval procedure shall comply with the provisions of GB 9623 (IEC 723--1). 3.2 Approval InspectionwwW.bzxz.Net
In order to obtain the appraisal approval, the manufacturer shall conduct batch inspections of three consecutive batches and a periodic inspection of one batch to provide quality consistency test data that meets the requirements of the detailed specification. Normal inspection shall be adopted, and the qualified quality level (AQL) and sampling plan shall be in accordance with the provisions of SJ/Z9007 (IEC410). For batch inspection, a bundle sampling plan with a qualified judgment number A. not less than 1 shall be adopted. 3.3 Quality Consistency Inspection
All blank detailed specifications, regardless of the assessment level, shall at least include the following content. 3.3.1 Batch inspection
3.3.1.1 Appearance quality
Appearance,
Marking;
Bending;
Bending and twisting (only for flat antenna core). 3.3.1.2 Electromagnetic parameters
Inductance r.(μap);
Quality factor Q.
3.3.2 Cyclic inspection
3.3.2.1 Mechanical parameters
Bending strength.
3.3.2.2 Environmental resistance
a. Low overflow:
b. Heat:
c. Rapid temperature change;
a. Steady state damp heat.
4 Test and measurement methods
CB 11437.-B9
Test and measurement methods shall be in accordance with the provisions of Chapter 4 of GB9623 (IEC723-1) and this chapter. 4.1 Appearance and dimensional inspection
4.1.1 Appearance defects and surface finish shall be inspected by comparing with samples with an allowable defect rate. The determination of appearance defects shall be in accordance with the provisions of GB9634 (IEC424). 4.1.2 Check the content and clarity of the markings on the core, label and (or) packaging in accordance with the provisions of the detailed specification. 4.1.3 Dimension marking shall comply with the requirements of Article 12.3 of GB9623 (IEC723-1). 4.1.4 The curvature of the circular antenna core and the total deformation (bending plus torsion) of the fan antenna core can be inspected by gauges made in accordance with GB9636 (IFC223) or other methods.
4.2 Measurement methods of electromagnetic parameters
4.2.1 General
The measuring instruments, methods, measuring voltages, measuring positions related to the line diagram and monitoring measures during measurement of the electromagnetic parameters of the magnetic core shall comply with the provisions of CB9635 (IEC492). The measuring frequency of the electromagnetic parameters of the magnetic core shall be specified in the detailed specifications and shall comply with the following series specified in Article 4-4 of GB9635 (IEC492) or GB11439IEC367-2): 1.3, 10, *...kHz.
The length, wall thickness and shape, depth, pitch and length of the coil skeleton of the circular antenna magnetic core measurement shall comply with the requirements of Article 5.4 of GB9635 (IEC492).
GB9635 shall be adopted
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