IPC-TM-650 EN 2022 试验方法.pdf - 第62页

1.0 Scope This test method identifies the major areas of concern during a visual examination and describes the recom- mended procedures. 2.0 Application Documents None. 3.0 Test Specimen Any representative clad or unclad…

Scope

After

selective chemical removal of the glass-

epoxy from around the through hole and its associated cir-

cuitry, an examination can be made with a microscope of the

plated-through hole (PTH), pad, and conductor at any angle.

Applicable Documents

None

Test Specimen

The

specimen is a part of a glass-epoxy

multilayer or double-sided PCB, which contains a PTH and its

associated interconnected circuitry, which is selected for

closer examination.

Apparatus

4.1

fume hood is to be used, due to the corrosive chemi-

cals used for this evaluation.

4.2

microscope, capable to examine the specimen at

magnifications of 50X to 100X

4.3

stirring hot plate, capable of maintaining a temperature

at 50°C.

4.4

Equipment

The

following equipment is needed to per-

form this test:

• Goggles

• Face mask

• Acid resistant apron or coat

• Acid resistant respirator

• Polyethylene beaker

• Polyvinyl chloride gloves

• Pyrex (glass) beaker

• Sodium dichromate sulfuric acid (Sp. Gr. 1.84)

• Support stand

• Hydrofluoric acid (48%)

• Thermometer

• Utility clamp

• Thermometer clamp

Procedure

Caution: Hydrofluoric and fluosulfonic acids and their vapors

are extremely toxic and corrosive. They should never be

opened or handled except with full protective clothing and

under a fume hood.

5.1

Reagents

For

the sulfuric chromic solution, take 35 ml

of a saturated sodium dichromate (Na

)

solution and

add 1 liter of concentrated sulfuric acid (H

)

in a Pyrex

vessel immersed in a cold water bath. In a polyethylene bea-

ker, make a fluosulfonic acid mixture using one part by weight

of sulfuric acid (H

)

and three parts by weight of hydrof-

luoric acid (H.F. 48%).

5.2

Immersion

a Pyrex beaker of predetermined size,

add enough sulfuric chromic solution to completely immerse

the specimen. Heat the solution to 50°C on a hot plate and

immerse the specimen. After the reaction is completed (the

disappearance of small bubbles), remove the specimen and

rinse in distilled water. Remove excess water with a tissue and

immerse the specimen in a fluosulfonic acid mixture at room

temperature. After two minutes, remove the specimen from

the fluosulfonic acid mixture, rinse in distilled water, and

remove excess water with a tissue. Repeat this process until

the desired amount of exposed circuitry is obtained.

5.3

Test Evaluation

Examine

the specimen under the

microscope and observe the structure and condition of the

PTH, interconnections, and layer-to-layer registration.

6 Notes

Fluosulfonic

acid must always be contained in a

polyethylene beaker.

2215

Sanders Road

Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.1.3

Subject

Plated-Through

Hole Structure Evaluation

Date

8/76

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.

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ASSOCIA

TION CONNECTING

ELECTRONICS INDUSTRIES

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1.0

Scope

This

test method identifies the major areas of

concern during a visual examination and describes the recom-

mended procedures.

2.0

Application Documents

None.

3.0

Test Specimen

Any

representative clad or unclad

sample of printed wiring material.

4.0

Equipment/Apparatus

Magnifier

or microscope

capable of up to 30X magnification, having a reticle capable of

measuring to the nearest 0.001 in.

5.0

Procedures

5.1 Pinholes

Pinholes

are predetermined by visual exami-

nation using not less than 10X magnification on the specimen.

Copper surfaces should be prepared by cleaning or light etch-

ing.

5.2

Pits and Dents

The

maximum total point count for pits

and dents, per square foot of panel inspected is determined

as follows:

Longest Dimension (inch) ..................................... Point Value

0.000 to 0.010 inclusive....................................................... 1

0. 011 to 0.020 inclusive ..................................................... 2

0.021 to 0.030 inclusive....................................................... 4

0.031 to 0.040 inclusive....................................................... 7

over 0.040 ......................................................................... 30

Pits and dents should be determined visually using not less

than 10X magnification on the specimen.

5.3

Scratches

can be measured with the use of

a microscope (30X maximum).

5.4

Wrinkles

should be viewed by normal or cor-

rected 20/20 vision.

5.5

Inclusions

should be measured using 18X

to 30X magnification.

6.0 Notes

For

additional reference see:

IPC-CF-150: Copper Foil

IPC-A-600: Acceptability of Printed Boards

MIL-P-13949: Laminate Materials

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.1.5

Subject

Surface

Examination, Unclad and Metal-Clad

Material

Date

12/82

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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1.0

Scope

This

method is designed to determine the thick-

ness of woven glass fabric, such as E-glass, S-glass, and

quartz, used as reinforcement in prepreg (resin-impregnated

glass fabric, or B-stage). It is applicable for glass fabric

inspection before and after impregnation.

2.0

Applicable Documents

FED-STD-191

3.0 Test Specimens

3.1 Size

Specimen

size of 101.6 x 101.6 mm [4.0 x 4.0 in]

is recommended; specimens used for determination of resin

content by Burn Off Method may be used. Specimens shall be

of sufficient size to insure that all points of the pressure foot of

the thickness gauge shall be at least 6.4 mm [0.25 in] from the

edge of the specimen.

3.2

Quantity and Sampling

Unless

otherwise specified,

three pieces of material shall be cut one each from three

sample sheets. Specimens shall be cut with the edges on a

bias to the orientation of the fabric. Specimens shall be free of

folds, creases, knots or other distortions which are not repre-

sentative of the material surface.

4.0

Apparatus or Material

4.1 Muffle furnace

Muffle

furnace that is capable of main-

taining 550 +/-50°C [1022 ±90°F].

4.2

Thickness Gage (Dead weight type)

dead weight

type thickness gage equipped with a dial graduated to read

with a precision of 0.0025 mm [0.0001 in] shall be used. The

pressure foot shall be circular with a diameter of 6.35

±0.025 mm [0.25 ±0.001 in], and with the moving parts

weighted to apply a total load of 173 ±14 kPa (25 ±2 psi) to

the specimen. The anvil shall be not less than 6.35 mm [0.250

in] in diameter. The micrometer shall be capable of repeating

its readings to 0.0013 mm [0.00005 in] at zero setting or on a

steel gage block.

5.0

Procedure

5.1 Preparation of Prepreg Specimens

Place specimens

in a muffle furnace at 550±50°C [1022 ±90°F], for a period of

time necessary to assure complete removal of the organics

(resin). After removal from the muffle furnace, the specimens

shall be cooled to room temperature.

5.2

Thickness Determination

The

specimen shall be

placed on the thickness gauge anvil, and the pressure foot

shall be closed onto the specimen at a location outside the

area to be measured. The pressure foot shall be backed off to

a distance of 0.008 to 0.01 mm [0.0003 to 0.0004 in], the

specimen moved to the measurement position, and the pres-

sure foot then released onto the specimen. The pressure foot

shall be allowed to rest there for a minimum of 5 seconds. The

dial reading shall then be taken to the nearest 0.0025 mm

[0.0001 in].

5.3

Evaluation

Record

each reading and report the

average of three measurements to the nearest 0.025 mm

[0.001 in].

6.0 Notes

See

Federal Test Method Standard No. 191,

Method No. 5050 for additional information and background

on this procedure.

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062-6135

IPC-TM-650

TEST

METHODS MANUAL

Number

2.1.6

Subject

Thickness

of Glass Fabric

Date

12/94

Revision

Originating Task Group

MIL-P-13949 Test Methods Task Group (7-11b)

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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