IPC-TM-650 EN 2022 试验方法.pdf - 第800页

6.3 Thermal equilibrium shall be assumed to have been attained when three successive temperature readings taken at five-minute intervals show a variation not greater than 3°C. 6.4 The exposure and transfer times specifie…

1.0 Scope

1.1

To determine the effects of exposing connectors to

extremes of high and low temperature and of the mechanical

stresses created by rapid transition between the temperature

extremes.

2.0 Reference Documents

2.1

Information in this section is intended to parallel the test

method described in EIA-RS-364/TP-32.

3.0 Test Specimen

3.1

A connector (plug and receptacle) complete with all

applicable guide, keying and engaging hardware or a card-

edge receptacle.

3.2 The plug and receptacle shall be tested in a configura-

tion normal to its functional capacity including mounting, ter-

mination, and mating.

3.3 The plug and receptacle or the card-edge receptacle

and a nominal thickness printed circuit board shall be mated

during this test, except as otherwise specified.

4.0 Apparatus

4.1

A dual chamber (or two separate chambers) capable of

maintaining the applicable temperature within ± 2°C at the

geometric center under no load conditions, and a thermal dis-

tribution not greater than ± 5°C of the temperature at the

geometrical center.

5.0 Procedure

5.1

The chamber(s) shall be adjusted to, and maintained at,

the high and low extremes specified in the individual connec-

tor specification. Thermal equilibrium shall be attained prior to

the start of the test. (See 6.3)

5.2 The mated test specimen shall be suspended within the

low temperature chamber and subjected to the number of

continuous thermal shock cycles specified in the individual

connector specification. One complete cycle of thermal shock

is defined by Table 1. (See 6.4)

Table 1 Thermal Shock Test Conditions (One Cycle)

Step Temperature, °C Time

1 Low extreme (+0, -5°C) 30 min. (min.)

2 25°C (+10, -5°C) 2 min. (max.)

3 High extreme (+5, -0°C) 30 Min. (min.)

4 25°C (+10, -5°C) 2 min. (max.)

WARNING:

BOTH THE HIGH AND LOW TEMPERATURE

EXTREMES USED DURING THIS TEST WILL CAUSE

SEVERE BURNS. USE INSULATED GLOVES WHEN HAN-

DLING THE TEST SPECIMEN.

5.3 After completion of the specified number of cycles and

attaining room ambient temperature, the sample shall be visu-

ally examined for evidence of the following:

A. Excessive permanent dimensional changes (distortion).

B. Cracking or delamination of finishes or dielectric materials.

C. Opening of seals or seams.

D. Hardening or softening of dielectric materials.

5.4 Unless otherwise specified in the individual connector

specification, the test specimen shall be subjected to the with-

standing voltage test, (3.13).

6.0

Notes

6.1 Acceptance criteria shall be established in terms of one,

or any combination, of the following:

A. Visible evidence of damage or significant material change.

B. A deterioration in withstanding voltage occasioned by

internal fissures in the dielectric with or without the

accompanying entrapment, of moisture.

6.2 The test chambers shall be of the forced (circulating) air

type to insure even temperature distribution.

2215 Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST METHODS MANUAL

Number

3.11

Subject

Thermal Shock, Connectors

Date

7/75

Revision

Originating Task Group

N/A

Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

Page1of2

ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES

6.3 Thermal equilibrium shall be assumed to have been

attained when three successive temperature readings taken at

five-minute intervals show a variation not greater than 3°C.

6.4 The exposure and transfer times specified in Table 1 are

based on an assumed sample weight less than 0.5 pound

(226 GMS). Appropriate increases in these periods shall be

made for larger samples to ensure that the designated test

temperature is attained.

IPC-TM-650

Number

3.11

Subject

Thermal Shock, Connectors

Date

7/75

Revision

Page2of2

1.0 Scope

1.1

To determine the effect on the connector of the stresses

produced by mechanical vibration within the predominant fre-

quency ranges and of amplitudes that may be encountered

during field service; two input vibration types are provided:

Sinusoidal — Used to determine critical frequencies, modes

of vibration, and other data necessary for planning protective

steps against the effects of undue vibration. The simple har-

monic motion provided by this method is not representative of

most vibration encountered during field service.

Random — Used to provide a closer approximation to the

complex, non-periodic vibration encountered during field ser-

vice.

2.0 Reference Documents

2.1

Information in this section is intended to parallel the test

method described in EIA-RS-364/TP-28.

3.0 Test Specimen

3.1

A connector (plug and receptacle) complete with appli-

cable guide, keying, and engaging hardware or a card-edge

receptacle and mating nominal-thickness printed circuit

board.

3.2 Mounting and Termination

3.2.1 Right Angle, Two-Piece Connector

The receptacle

shall be mounted and terminated normally during this test;

receptacles designed for mounting on non-rigid bases (e.g.,

motherboards, metal-plate back panels, etc.) shall be

mounted on the smallest section of such a base that will

accommodate the test specimen. The plug shall be termi-

nated normally during this test and shall be mounted on a

nominal-thickness printed circuit board extending the full

width of the plug; the board shall extend a minimum of four

inches from the receptacle when the connector is mated.

3.2.2 Card-Edge Receptacle The receptacle shall be

mounted and terminated normally during this test (see 3.2.1 ).

The mating printed circuit board shall extend the full width of

the receptacle and shall extend a minimum of four inches from

the receptacle when mated.

3.2.3 Parallel, Two-Piece Connector The receptacle and

plug shall be terminated normally during this test; both com-

ponents shall be mounted on nominal-thickness printed circuit

boards extending the full width of each. The printed circuit

boards shall extend a minimum of four inches from each com-

ponent when the connector is mated.

3.3 Fixturing

3.3.1 Right Angle Connector

The test specimen shall be

held in an adequate resonant free fixture. (Figure 1, Reference

example.)

3.3.2 Parallel Connector The test specimen shall be held

in an adequate resonant free fixture. (Figure 2, Reference

example.)

3.4 The connector shall be wired (or printed circuit boards

designed) such that a continuous electrical circuit (comprising

all contacts in series) is formed when the plug (or board) and

receptacle are mated.

4.0 Apparatus

4.1

An electrodynamics vibration system and associated

instrumentation capable of producing the vibration indicated in

Table 1 and Figures 3 and 4 as specified in the individual con-

nector specification. The system shall be capable of maintain-

ing the vibratory input within the following tolerances:

Displacement – ± 10%

Acceleration – ± 10%

Power Spectral Density – ± 3.0 DB (50 Hz maximum

filter bandwidth)

Frequency – ± 2%

4.2 A circuit monitor capable of supplying a continuous cur-

rent of 100 milliamperes and of detecting discontinuities in this

current greater than 1 microsecond.

5.0 Procedure

5.1 Calibration

5.1.1

The vibration system shall be set up to provide the

sinusoidal or random vibratory input in accordance with

2215 Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST METHODS MANUAL

Number

3.12

Subject

Vibration, Connectors

Date

7/75

Revision

Originating Task Group

N/A

Material in this Test Methods Manual was voluntarily established by Technical Committees of the IPC. This material is advisory only

and its use or adaptation is entirely voluntary. IPC disclaims all liability of any kind as to the use, application, or adaptation of this

material. Users are also wholly responsible for protecting themselves against all claims or liabilities for patent infringement.

Equipment referenced is for the convenience of the user and does not imply endorsement by the IPC.

Page1of6

ASSOCIATION CONNECTING

ELECTRONICS INDUSTRIES