IPC-TM-650 EN 2022 试验方法.pdf - 第686页

1 Scope This method is to determine the electrical perfor- mance of multilayer printed wiring boards by following the shock with an electrical continuity test as specified. 2 Applicable Documents None 3 Test Specimen Com…

5.4

Exposure

5.4.1

Prior

to operation, all temperature-vacuum apparatus

such as the heating bar, separators, and cooling plates shall

be clean and aligned.

5.4.2

Place

the test specimen and boat into the specimen

compartment in the temperature-vacuum system. Mount the

respective cover plates of each specimen compartment and

at least three (3) control compartments.

5.4.3

and activate the vacuum system and allow the

system to evacuate to 7.0 X 10

-3

(5 X 10

-5

Torr)

or less

within one hour. During this period, control of the collector

plate temperature at 25 °C ± 1 °C [77 °F ± 2 °F] shall be

achieved.

5.4.4

When

the required vacuum has been achieved, turn

on the heater bar and adjust the controller to heat the bar to

125 °C ± 1°C [257 °F ± 2 °F] within 60 minutes.

5.4.5

Maintain

the collector plate temperatures at 25 °C ±

1 °C [77 °F ± 2 °F] and the heater bar temperature at 125 °C

± 1 °C [257 °F ± 2 °F] for 24 hours. After this time period close

the vacuum valve to the pumping system and turn off the cur-

rent to the heater bars.

5.4.6

Open

the vent valve and backfill with clean, dry nitro-

gen at a gage pressure of 10 to 30 kPa (2 to 4 psi) above

atmosphere to rapidly cool the bars to 50 °C [122 °F] within

two hours, nominally.

5.4.7

Turn

off the collector-plate heat exhchangers, return

the vacuum chamber to room pressure using clean, dry nitro-

gen, and open the chamber. Remove the aluminum specimen

boats and their respective collector plates and the control col-

lector plates and immediately store in the dry desiccator (see

4.3).

5.4.8

After

allowing the specimens to cool to approximately

room temperature, but after no more than 1/2 hour, weigh the

specimens and boats and the collector plates to the nearest

1 microgram within two minutes of removal from the desicca-

tors.

5.5

Evaluation of Test

5.5.1

Measurements

of the control collector plates are used

to detect contamination and/or poor technique. Mass loss of

greater than 20 micrograms is an indication of poor cleaning

of the collector plates. Mass gain of greater than 50 micro-

grams is an indication of poor cleaning of elements of the

apparatus, cross contamination between specimen compart-

ments, or poor vacuum technique. Any change of 50 micro-

grams or greater calls for a review of or change in technique.

All data obtained during such runs shall be discarded and the

test rerun when the system(s) are corrected.

5.5.2

Calculation

of Total Mass Loss (TML). Calculate the

TML as follows:

Initial Mass Final Mass

Specimens Weights:

)-B S

)-B

Mass Loss (L) = S

-S

Total

Mass Loss (TML) (%) = (L/S

)

X 100

Where:

B = Mass of boat in grams

Initial specimen mass in grams

Final Specimen mass in grams

L = Mass Loss in grams

5.5.3

Calculate

the Collected Condensable Volatile Material

(CVCM) as follows:

Mass of condensable material (C

)=C

-C

CVCM

(%) = (C

)

X 100 Where:

Final mass of collector plate in grams

Initial mass of collector plate in grams

Mass of condensable material in grams

Initial specimen mass in grams

6 Notes

6.1

useful outgassing test data sheet format can be found

in Appendix X1 of ASTM E 595.

6.2

Additional

information regarding this test method and

suggested requirements for certain spacecraft applications

can be found in NASA SP-R-0022.

IPC-TM-650

Number

2.6.4

Subject

Outgassing,

Printed Boards

Date

05/04

Revision

age2of2

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Scope

This

method is to determine the electrical perfor-

mance of multilayer printed wiring boards by following the

shock with an electrical continuity test as specified.

Applicable Documents

None

Test Specimen

Complete

multilayer printed wiring board

or qualification test board IPC-A-47.

Apparatus

4.1

standard AVCO 150 pneumatic drop shock tester, or

equivalent, capable of attaining at least 150 Gs.

4.2

High-speed

motion picture and oscilloscope photogra-

phy is not normally necessary and is not recommended for the

average ‘‘go no-go’’ testing program.

Procedure

5.1 Preparation

Fixture the test pattern boards so they are

restrained on all four edges. Fabricate the fixtures so that it

can be oriented to test the boards on three principle planes.

5.2

Test

Subject

each specimen to three shock pulses of

100 Gs with a duration of 6.5 milliseconds in each of the three

principle planes—a total of nine blows.

5.3

Evaluation

Subject

each specimen to a continuity test

as specified.

6 Notes

None

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.6.5

Subject

Physical

Shock, Multilayer Printed Wiring

Date

05/04

Revision

Originating Task Group

Rigid Printed Board Performance Task Group

(D-33a)

Material

in this Test Methods Manual was voluntarily established by Technical Committees of 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 IPC.

age1of1

ASSOCIA

TION CONNECTING

ELECTRONICS INDUSTRIES

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1.0

Scope

This

test is conducted for the purpose of deter-

mining the resistance of a material such as a laminate or mul-

tilayer circuit board, to the shock of repeated exposures to

extremes of high and low temperatures for comparatively

short periods of time.

2.0

Applicable documents

None

3.0

Test specimen

The

test specimen for this test shall be

a sheet of laminate material at least 6 inch x 6 inch by the

thickness of the laminate. In the case of multilayer boards, the

test specimen shall be the entire qualification specimen

detailed in part 5.8.4 of this publication.

4.0

Apparatus

chamber automatic temperature cycling

equipment suitable for the temperature extremes specified

herein. The air temperature shall be maintained by forced air

circulation. The chamber shall have sufficient heating or cool-

ing capacity to maintain the specified air temperature.

5.0

Procedure

5.1 Conditions

During

the exposures, maintain the cham-

ber at the temperatures shown below:

Class

A Class B

Step

emp.

(°C)

Time

(Min.)

Temp.

(°C)

Time

(Min.)

1 125+3/–0 30 85+3/–0 30

2 25+10/–5 10–15 25+10/–5 10–15

3 –65+0/–5 30 –55+0/–5 30

4 25+10/–5 10–15 25+10/–5 10–15

5.2 Preparation

The

test specimen must be cleaned of

dirt, grease, and other contaminants prior to the thermal

exposure. The test specimen should be cleaned by wiping

with a dry, clean lint-free cloth, or wiped with a clean lint-free

cloth dampened with acetone or isopropyl alcohol. The speci-

men must be allowed to air dry prior to thermal exposure.

5.3

Test exposure

The

test specimen must be placed in

the thermal chamber maintained at the temperature specified

in Step 1 for the appropriate test condition. The test specimen

must be maintained at each temperature in the order speci-

fied. Throughout the test, the specimen must be placed in

such a position so that there is essentially no obstruction to

the flow of air around them. The specimen should be sub-

jected to the specified temperatures in the sequence specified

for a total of five cycles performed continuously.

5.4

Upon

copulation of the five temperature cycles, allow

the specimen to return to room temperature. Visually inspect

the specimen in accordance with detailed requirements.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.6.6

Subject

Temperature

Cycling, Printed Wiring Board

Date

12/87

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.

age1of1

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