IPC-TM-650 EN 2022 试验方法.pdf - 第98页

1.0 Scope This test method is designed to determine the thickness of unclad or metallic clad laminate, with or without the cladding, using mechanical measurements. 2.0 Applicable Documents IPC-TM-650 Method 2.3.6, Etchin…

5.3

necessary, and for referee tests, blow the surface to

be tested with clean compressed (or canned) air to remove

loose debris.

5.4

Place

the profilometer drive mechanism such that the

probe travels across the foil in the transverse direction.

5.5

Set

the measurement parameters required in 4.2.

5.6

Initiate

the drive mechanism to make a single determina-

tion of the desired parameter.

5.7 Move

the drive mechanism and make two additional

measurements in two other areas of the specimen.

Calculation

6.1

Calculate

the average value for the three determinations

on the specimen.

6.2

Use

the average value of one or more specimens to

conform to the value specified in the material specification.

Report

7.1

Report

the value required by the specification to the

nearest 0.1 microinch or 0.01 micrometer for R

and

to the

nearest 0.01 mils or 0.1 micrometer for R

Apparatus Sources

8.1

Perthometer

M4P; STDS PGN-3 and PGN-10

Atlantech Sales Inc.

8825 Roswell Rd., Suite 591

Atlanta, GA 30350

(404) 992-3329

8.2

Surtronic

Rank Taylor Hobson LTD

PO Box 36

Gathlaxton St.

Leicester LE2 OSL England 0533-23801

8.3

Rodenstock

RM600 Laser Profilometer -

Noncontacting

Mahr Corp.

11435 Williamson Road

Cincinnati, OH 45241

IPC-TM-650

Number

2.2.17A

Subject

Surface

Roughness and Profile of Metallic Foils (Contacting

Stylus Technique)

Date

2/2001

Revision

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1.0

Scope

This

test method is designed to determine the

thickness of unclad or metallic clad laminate, with or without

the cladding, using mechanical measurements.

2.0

Applicable Documents

IPC-TM-650

Method

2.3.6, Etching, Ammonium Persulfate

Method 2.3.7, Etching, Ferric Chloride

Method 2.3.7.1, Cupric Chloride Etching

Method 2.3.7.2, Alkaline Etching

3.0

Test Specimens

Consult

with the applicable specifica-

tion for size or configuration, quantity, and location taken from

the laminate.

3.1

Size

Test

specimens may be strips cut from the lami-

nate and shall be 12.7 mm [0.5 in] wide, minimum. Sheets or

cut-to-size panels may be used as specimens.

3.2

Sampling

Unless

otherwise specified, two specimens

shall be taken from locations within the sampling that repre-

sent the centermost area and the edges, but no closer than

25.4 mm [1.0 in] from the edge, of the as-manufactured

sheet.

4.0

Apparatus or Material

4.1

Micrometer

with a minimum throat depth of 25.4 mm

[1.0 in] and with accuracy of 0.0025 mm [0.0001 in], or

equivalent.

4.2

Etching

system capable of complete removal of metallic

cladding. IPC Test Methods 2.3.6, 2.3.7, 2.3.7.1, or 2.3.7.2

shall be used for referee testing.

5.0

Procedure

5.1 Specimen Preparation

5.1.1 Method A, Metallic Cladding Removed

This

method

is used to determine base laminate thickness by

direct measurement of the laminate without cladding. It shall

be used for qualification or referee testing.

5.1.1.1

Completely

etch the test specimen in accordance

with accepted industry practices.

5.1.2

Method B, As Manufactured

This

method is used

to determine overall thickness of unclad or metallic clad lami-

nates. It is used to determine base thickness of metallic clad

laminates when evaluated in accordance with 5.3.2.2.2.

Unless otherwise specified, it shall be used for product accep-

tance inspection.

5.1.2.1

The

specimens shall be tested in the

as-manufactured condition.

5.2

Measurements

Using

the micrometer, determine the

thickness of the specimen. Unless otherwise specified, speci-

mens that are sheets or panels shall be measured at least

25.4 mm [1.0 in] from the edge at all four (4) corners.

5.3

Evaluation

5.3.1 Data Recording

For

purposes including qualification

or referee testing, product evaluation, statistical analysis, etc.,

each thickness measurement shall be recorded, unless other-

wise specified.

5.3.2

Compliance to Specification

5.3.2.1 Unclad laminates or metallic clad laminates with

overall nominal thickness

Measurements

taken after

specimen preparation per 5.1.2 shall be compared with the

applicable specification for compliance to the required toler-

ances.

5.3.2.2

Metallic Clad Laminates with Base Nominal

Thickness

5.3.2.2.1 Compliance to Specification Using Method A

Specimen Preparation

Measurements

taken after speci-

men preparation per 5.1.1 shall be compared with the appli-

cable specification for compliance to the required tolerances.

5.3.2.2.2

Compliance to Specification Using Method B

Specimen Preparation

The

Institute for Interconnecting and Packaging Electronic Circuits

2215 Sanders Road • Northbrook, IL 60062

IPC-TM-650

TEST

METHODS MANUAL

Number

2.2.18

Subject

Determination

of Thickness of Laminates

by Mechanical Measurement

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.

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5.3.2.2.2.1

Calculate

the overall nominal thickness by add-

ing to the base nominal thickness the total thickness of the

metallic cladding. Thickness of metallic cladding shall be

based on .035 mm [0.0014 in] per 45.7 g [1.0 oz], or as sup-

plied by the foil supplier.

5.3.2.2.2.2 Calculate the minimum and maximum limits by

subtracting and adding the required tolerance from the over-

all nominal thickness.

5.3.2.2.2.3 Measurements

taken after specimen prepara-

tion per 5.1.2 shall be compared with the minimum and maxi-

mum limits as determined in 5.3.2.2.2.

5.4

Report

Unless

otherwise specified, report the average,

minimum and maximum readings, and compliance with

requirements, if applicable.

6.0 Notes

6.1

Use

of hand or manual micrometers should be carefully

administered. Pressure, anvil shape, and other features of the

micrometer and its use must follow accepted industry

practices, if not defined in the applicable specification.

IPC-TM-650

Number

2.2.18

Subject

Determination

of Thickness of Laminates

by Mechanical Measurement

Date

12/94

Revision

age2of2

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