SIST EN ISO 3650:2000

SLOVENSKI STANDARD
SIST EN ISO 3650:2000
01-december-2000
Geometrical product specifications (GPS) - Length standards - Gauge blocks (ISO
3650:1998)
Geometrical product specifications (GPS) - Length standards - Gauge blocks (ISO
3650:1998)
Geometrische Produktspezifikation (GPS) - Längennormale - Parallelendmaße (ISO
3650:1998)
Spécification géométrique des produits (GPS) - Etalons de longueur - Cales-étalons (ISO
3650:1998)
Ta slovenski standard je istoveten z: EN ISO 3650:1998
ICS:
17.040.30 Merila Measuring instruments
SIST EN ISO 3650:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 3650:2000

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SIST EN ISO 3650:2000

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SIST EN ISO 3650:2000

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SIST EN ISO 3650:2000

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SIST EN ISO 3650:2000

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SIST EN ISO 3650:2000
INTERNATIONAL ISO
STANDARD 3650
Second edition
1998-12-15
Geometrical Product Specifications
(GPS) — Length standards — Gauge blocks
Spécification géométrique des produits (GPS) — Étalons de longueur —
Cales-étalons
A
Reference number
ISO 3650:1998(E)

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SIST EN ISO 3650:2000
ISO 3650:1998(E)
Contents
1 Scope .1
2 Normative references .1
3 Definitions .1
4 Nomenclature of faces .3
5 Basis of measurement, traceability, reference condition.4
5.1 Unit of length: metre.4
5.2 Traceability of the length of a gauge block.4
5.3 Reference temperature and standard pressure.4
5.4 Reference orientation of gauge blocks .5
6 General dimensions, material properties, marking.5
6.1 General dimensions.5
6.2 Material properties.5
6.2.1 Material .5
6.2.2 Coefficient of thermal expansion.6
6.2.3 Hardness.6
6.2.4 Dimensional stability.6
6.3 Marking .6
7 Metrological requirements.6
7.1 General.6
7.2 Flatness tolerance, t .7
f
7.2.1 Gauge blocks with nominal lengths exceeding 2,5 mm .7
7.2.2 Gauge blocks with nominal lengths up to 2,5 mm .7
7.3 Measuring faces.7
©  ISO 1998
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
7.4 Side faces . 7
7.4.1 Flatness . 7
7.4.2 Parallelism. 8
7.4.3 Perpendicularity. 8
7.4.4 Edges . 9
8 Calibration of gauge blocks. 9
8.1 General . 9
8.2 Wringing test. 10
8.3 Measurement by interferometry. 10
8.3.1 Measured length . 10
8.3.2 Auxiliary plate . 10
8.3.3 Corrections to measurements by interferometry . 10
8.3.4 Calibration certificate. 10
8.4 Measurement by comparison. 11
8.4.1 Principle of measurement. 11
8.4.2 Central length. 11
8.4.3 Method of determining length by comparison . 11
8.4.4 Variation in length . 11
8.4.5 Corrections. 12
8.4.6 Calibration certificate. 12
Annex A (informative) Example of a device for the comparison of gauge blocks . 13
Annex B (informative) Relation to the GPS matrix model. 14
Annex C (informative) Bibliography . 15
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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO
member bodies). The work of preparing International Standards is normally carried out through ISO technical
committees. Each member body interested in a subject for which a technical committee has been established has
the right to be represented on that committee. International organizations, governmental and non-governmental, in
liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical
Commission (IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 3650 was prepared by Technical Committee ISO/TC 213, Dimensional and geometrical
product specifications and verification.
This second edition cancels and replaces the first edition (ISO 3650:1978), which has been technically revised.
Annexes A, B and C of this International Standard are for information only.
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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
Introduction
This International Standard is a geometrical product specification standard and is to be regarded as a general GPS
standard (see ISO/TR 14638). It influences chain link 6 (Calibration requirements — Calibration standards) of the
chain of standards on size and distance.
For more detailed information on the relation of this standard to the GPS matrix model, see annex B.
Gauge blocks are length standards representing specified fractions of the unit of length, the metre, of the
international system of units SI. Depending on the kind of application and the required quality, gauge blocks are
offered in several grades. The calibration of the gauge blocks, i.e. the measurement of the length value at a
specified point of the measuring face and the evaluation of the measurement uncertainty, is the basis for the
application of gauge blocks as length standards.
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SIST EN ISO 3650:2000

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SIST EN ISO 3650:2000
INTERNATIONAL STANDARD  © ISO ISO 3650:1998(E)
Geometrical Product Specifications (GPS) — Length
standards — Gauge blocks
1 Scope
This International Standard specifies the most important design and metrological characteristics of gauge blocks
with a rectangular cross section and a nominal length l ranging from 0,5 mm to 1 000 mm.
n
Limit deviations and tolerances are stated for the calibration grade K and for the grades 0, 1 and 2 for various
measuring purposes.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
ISO 1:1975,
Standard reference temperature for industrial length measurements.
1)
ISO 1101:— , Geometrical Product Specifications (GPS) — Geometrical tolerancing — Generalities, definitions,
symbols, indication on drawings.
ISO 6507-1:1997, Metallic materials — Vickers hardness test — Part 1: Test method.
ISO 14253-1:1998, Geometrical Product Specifications (GPS) — Inspection by measurement of workpieces and
measuring equipment — Part 1: Decision rules for proving conformance or non-conformance with specifications.
International vocabulary of basic and general terms in metrology (VIM). BIPM, IEC, IFCC, ISO, IUPAC, IUPAP,
OIML, 2nd edition, 1993.
3 Definitions
For the purposes of this International Standard, the definitions given in ISO 14253-1, VIM and the following apply.
3.1
gauge block
material measure of rectangular section, made of wear-resistant material, with one pair of planar, mutually parallel
measuring faces, which can be wrung to the measuring faces of other gauge blocks to make composite assemblies,
or to similarly finished surfaces of auxiliary plates for length measurements

1)
To be published. (Revision of ISO 1101:1983)
1

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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
3.2
length of a gauge block
l
perpendicular distance between any particular point of the measuring face and the planar surface of an auxiliary
plate of the same material and surface texture upon which the other measuring face has been wrung
See figure 1.
NOTES
1 The length of a gauge block, l, includes the effect of one-face wringing (see 8.3.1).
2 The length, l, is a physical quantity consisting of a numerical value and a length unit (e.g. metre, millimetre or micrometre).
If only the numerical value is treated (e.g. in tables), the units should be stated explicitly.
3.3
central length of a gauge block
l
c
length of a gauge block taken at the centre point of the free measuring face
See figure 1.
NOTE — Length l is a special instance of length l.
c
Key
1 Auxiliary plate
Figure 1 — Central length l and another example of length l at any point of a gauge block wrung to the
c
plane surface of an auxiliary plate
3.4
deviation of the length at any point from nominal length
e
algebraic difference l – l
n
3.5
deviation from flatness
f
d
minimum distance between two parallel planes between which all points of the measuring face lie
See figure 2.
2

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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
1) See 7.1.
Figure 2 — Deviation f from flatness
d
3.6
variation in length
v
difference between the maximum length l and the minimum length l
max min
See figure 3.
NOTE — The variation in length is equal to the sum of the deviations f and f from the central length l .
o u c
NOTE — See table 4.
Figure 3 — Nominal length l ; central length l ; variation v with f and f ; limit deviations t for the length at
n c o u e
any point, proceeding from the nominal length
3.7
wringing
property of the measuring faces of gauge blocks to adhere to other measuring faces or to faces with similar surface
finish as a result of molecular forces
4 Nomenclature of faces
See figure 4.
3

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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
a) for nominal lengths l < 6 mm
n
b) for nominal lengths l Ä 6 mm
n
Key
1 Left hand measuring face
2 Right hand measuring face
3 Unmarked measuring face
4 Marked measuring face
5 Side faces
6 Marked side face
NOTE — For the complete marking, see 6.3.
Figure 4 — Nomenclature of faces
5 Basis of measurement, traceability, reference condition
5.1 Unit of length: metre
The metre is defined as the length of the path travelled by light in vacuum in 1/299 792 458 of a second (17th
General Conference of Weights and Measures, 1983).
The definition is realized by working wavelength standards recommended by the International Committee of
Weights and Measures (CIPM).
5.2 Traceability of the length of a gauge block
The measured length of a gauge block is traceable to national or international length standards, if the measurement
result can be related by an unbroken chain of comparison measurements each with stated uncertainties to a gauge
block which has been calibrated by interferometry using appropriate wavelength standards.
5.3 Reference temperature and standard pressure
The nominal length and the measured lengths of a gauge block apply at the reference temperature of 20 °C (see

ISO 1) and the standard pressure 101 325 Pa = 1,013 25 bar.
NOTE — The effect on the length of a gauge block caused by deviations from the standard pressure may be ignored under
normal atmospheric conditions.
4

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SIST EN ISO 3650:2000
© ISO
ISO 3650:1998(E)
5.4 Reference orientation of gauge blocks
The length of a gauge block up to and including 100 mm nominal length refers to the vertical orienta
...