Test items and standards of IC chip electrical performance test

Date：2022-03-02 17:56:00 Views：1547

The electrical performance of electronic and electrical equipment directly affects the safe and reliable operation of the whole electrical system. In order to ensure the safety of equipment, all electronic and electrical equipment must pass various type tests in the production and manufacturing process to ensure the safety of electrical environment. Electrical performance test includes the test of basic parameters of conductor or insulation quality, such as conductor resistance, insulation resistance, correct value of dielectric loss angle, capacitance, etc. The higher the working voltage of the cable, the stricter the requirements for its electrical performance.

Introduction to electrical performance:

1. Electrical performance index, DC resistance and AC impedance of conductor, insulation resistance of insulating layer.

2. The main dielectric properties are loss, electric field distribution and electric field strength, cable capacitance, inductance, current carrying capacity, induced voltage and current of metal sheath.

3. In terms of electrical properties, mechanical strength, elongation, mechanical properties of insulating sheath materials, flame retardancy, insulation aging life, etc.

4. Electrical property refers to the electrical characteristics of the electrical load, the importance of the electrical load, the time, occasion, purpose and allowable outage time of the electrical load.

5. Different power consumption properties of electrical performance have different requirements and effects on power supply quality, and their positions in the power load curve of power grid are also different.

Detection of electrical performance:

The test of electrical performance includes the test of basic parameters of conductor or insulation quality such as conductor resistance, insulation resistance, dielectric loss and capacitance. The higher the working voltage of the cable, the stricter the requirements for its electrical performance.

1. DC resistance test of conductive core:

The resistance of the cable of each nominal section shall not exceed a certain value, otherwise it will increase the core loss of the cable during use, resulting in cable heating, which will not only consume electric energy and accelerate the aging of plastic cable, but also bring danger to the reliability and stability of cable operation. Double arm bridge measurement is commonly used.

2. Insulation resistance test

The ratio of DC voltage U applied to insulation to leakage current I is called insulation resistance R. The insulation resistance of cable is mainly to judge the moisture degree and insulation quality of cable insulation layer. If the cable is not dry enough in the manufacturing process, or is too wet, the insulation resistance will be greatly reduced. In addition, if the insulating layer contains too many conductive impurities, the insulation resistance will also be reduced. If the insulation resistance of the cable is too small, it will cause large leakage current, increase the insulation temperature and accelerate the aging of the wire. Voltage current method is widely used to measure the insulation resistance of cables.

3. Immersion voltage test

Most wires and cables for electrical equipment do not have metal sheath or metal wire braid as the external electrode during voltage test. When conducting voltage withstand test on these products, they must be immersed in water, that is, water is used as the external electrode with insulation surface and uniform contact resistance between products and products. It is mainly applicable to insulated wire core and single core sheathed wire and cable of products. During the test, the conductive wire core is connected to the high-voltage end and the water is connected to the low-voltage end. Check the grounding reliability before the test and fully discharge after the test.

4. Spark test

Spark withstand voltage test is a fast and connected voltage withstand test method. The purpose of the test is to find out whether there are defects in the process or impurities in the material, so as to ensure the basic electrical performance of the product. In the spark test, the conductor must be grounded.

5. Partial discharge test

It refers to the phenomenon of local and repeated breakdown and extinction under a certain applied voltage due to the weakness in the insulating medium. The purpose of the test is to judge whether the sample has obvious partial discharge under the working voltage, and to assess the free performance in the insulation; Measure the initial voltage of internal discharge of insulation; Measure the degree of partial discharge under the specified voltage. At present, the most commonly used high-frequency electric pulse measurement method.

Relevant test standards:

GB 11297.11-1989 test method for dielectric constant of pyroelectric materials

Test methods for properties of piezoelectric ceramics -- Measurement of relative free permittivity and temperature characteristics

GB / T 12636-1990 strip line test method for complex permittivity of microwave dielectric substrates

GB / T 1693-2007 vulcanized rubber Determination of dielectric constant and dielectric loss tangent

GB / T 2951.51-2008 general test methods for insulating and sheathing materials of electric and optical cables Part 51: special test methods for filling paste drop oil separation low temperature brittleness total acid value corrosivity dielectric constant at 23 ℃ and DC resistivity at 100 ℃

GB / T 5597-1999 test method for microwave complex permittivity of solid dielectrics

GB / T 7265.1-1987 test method for microwave complex permittivity of solid dielectrics perturbation method

Test method for microwave complex permittivity of solid dielectrics "open cavity" method

SJ / T 10142-1991 test method for microwave complex permittivity of dielectric materials coaxial terminal open circuit method

SJ / T 10143-1991 test method for microwave complex permittivity of solid dielectrics reentrant cavity method

Test method of dielectric constant and high frequency dielectric constant of glass SJ / t-1996

SJ / T 1147-1993 test method for dielectric loss tangent and dielectric constant of organic thin films for capacitors

SJ 20512-1995 test method for complex permittivity and complex permeability of microwave large loss solid materials

SY / T 6528-2002 measurement method of dielectric constant of rock samples

GB / T 3333-1999 test method for power frequency breakdown voltage of cable paper

GB / T 3789.17-1991 test method for electrical properties of transmitting tubes test method for electrical strength

GB / T 507-2002 determination of breakdown voltage of insulating oils

GB 7752-1987 test method for power frequency breakdown strength of insulating adhesive tapes

SH / T 0101-1991 petroleum wax and petroleum grease determination of dielectric strength

GB / T 1424-1996 test method for resistance coefficient of precious metals and their alloys

GB / T 351-1995 measurement method of resistance coefficient of metallic materials

Hg / T 3331-1978 determination of volume resistance coefficient and surface resistance coefficient of insulating paint film (original Hg / T 2-59-78)

Hg 3332-1978 determination of arc resistance of insulating paints

Hg / T 3332-1980 determination of arc resistance of arc resistant paint