EN ISO 7500-1:1999
(Main)Metallic materials - Verification of static uniaxial testing machines - Part 1: Tension/compression testing machines (ISO 7500-1:1999)
Metallic materials - Verification of static uniaxial testing machines - Part 1: Tension/compression testing machines (ISO 7500-1:1999)
This part of ISO 7500 specifies the verification of tension/compression testing machines. The verification consists of: a general inspection of the testing machine, including its accessories for the force application, and a calibration of the force-measuring system.
Metallische Werkstoffe - Prüfung von Prüfmaschinen für statische einachsige Beanspruchung - Teil 1: Zug - und Druckprüfmaschinen (ISO 7500-1:1999)
In diesem Teil von ISO 7500 ist die Prüfung von Zug-Druckprüfmaschinen festgelegt. Diese Prüfung besteht aus: - einer allgemeinen Inspektion der Prüfmaschine einschließlich der Maschinenteile für die Kraftaufbringung, - einer Kalibrierung der Kraftmeßeinrichtung. Diese Norm bezieht sich nicht auf die Kalibrierung von Längenänderungs-Meßeinrichtungen (siehe ISO 9513).
Matériaux métalliques - Vérification des machines pour essais statiques uniaxiaux - Partie 1: Machines d'essai de traction/compression - Vérification et étalonnage du système de mesure de charge (ISO 7500-1:1999)
Kovinski materiali - Preverjanje statičnih enoosnih preskuševalnih strojev - 1. del: Preskuševalni stroji za natezni/tlačni preskus (ISO 7500-1:1999)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN ISO 7500-1:2000
01-oktober-2000
1DGRPHãþD
SIST EN 10002-2:1996
.RYLQVNLPDWHULDOL3UHYHUMDQMHVWDWLþQLKHQRRVQLKSUHVNXãHYDOQLKVWURMHYGHO
3UHVNXãHYDOQLVWURML]DQDWH]QLWODþQLSUHVNXV ,62
Metallic materials - Verification of static uniaxial testing machines - Part 1:
Tension/compression testing machines (ISO 7500-1:1999)
Metallische Werkstoffe - Prüfung von Prüfmaschinen für statische einachsige
Beanspruchung - Teil 1: Zug - und Druckprüfmaschinen (ISO 7500-1:1999)
Matériaux métalliques - Vérification des machines pour essais statiques uniaxiaux -
Partie 1: Machines d'essai de traction/compression - Vérification et étalonnage du
systeme de mesure de charge (ISO 7500-1:1999)
Ta slovenski standard je istoveten z: EN ISO 7500-1:1999
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
SIST EN ISO 7500-1:2000 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN ISO 7500-1:2000
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SIST EN ISO 7500-1:2000
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SIST EN ISO 7500-1:2000
INTERNATIONAL ISO
STANDARD 7500-1
Second edition
1999-09-01
Metallic materials — Verification of static
uniaxial testing machines —
Part 1:
Tension/compression testing machines —
Verification and calibration of
the force-measuring system
Matériaux métalliques — Vérification des machines pour essais statiques
uniaxiaux —
Partie 1: Machines d'essai de traction/compression — Vérification et
étalonnage du système de mesure de charge
A
Reference number
ISO 7500-1:1999(E)
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SIST EN ISO 7500-1:2000
ISO 7500-1:1999(E)
Contents Page
1 Scope .1
2 Normative reference .1
3 Terms and definitions .1
4 Symbols and their meanings.2
5 General inspection of the testing machine .3
6 Calibration of the force-measuring system of the testing machine .3
7 Class of testing machine range.8
8 Verification report.8
9 Intervals between verifications .9
Annex A (normative) General inspection of the testing machine .10
Annex B (informative) Inspection of the loading platens of the compression testing machines.11
Annex C (informative) Alternative method of testing machine classification.12
Bibliography.13
© ISO 1999
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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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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
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 7500-1 was prepared by Technical Committee ISO/TC 164, Mechanical testing of
metals, Subcommittee SC 1, Uniaxial testing.
This second edition cancels and replaces the first edition (ISO 7500-1:1986) which has been technically revised.
ISO 7500 consists of the following parts, under the general title Metallic materials — Verification of static uniaxial
testing machines:
Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system
Part 2: Tension creep testing machines — Verification of the applied load
Annex A forms a normative part of this part of ISO 7500. Annexes B and C are for information only.
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SIST EN ISO 7500-1:2000
INTERNATIONAL STANDARD © ISO ISO 7500-1:1999(E)
Metallic materials — Verification of static uniaxial testing
machines —
Part 1:
Tension/compression testing machines — Verification and calibration
of the force measuring system
1 Scope
This part of ISO 7500 specifies the verification of tension/compression testing machines.
The verification consists of:
a general inspection of the testing machine, including its accessories for the force application;
a calibration of the force-measuring system.
NOTE This part of ISO 7500 addresses the static verification of the force-measuring systems and the calibration values are
not necessarily valid for high-speed or dynamic testing applications. Further information regarding dynamic effects is given in
the Bibliography.
2 Normative reference
The following normative document contains provisions which, through reference in this text, constitute provisions of
this part of ISO 7500. For dated references, subsequent amendments to, or revisions of, any of these publications
do not apply. However, parties to agreements based on this part of ISO 7500 are encouraged to investigate the
possibility of applying the most recent editions of the normative document indicated below. For undated references,
the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of
currently valid International Standards.
ISO 376, Metallic materials — Calibration of force-proving instruments used for the verification of uniaxial testing
machines.
3 Terms and definitions
For the purposes of this part of ISO 7500, the following term and definition apply.
3.1
calibration
set of operations that establish, under specified conditions, the relationship between values of quantities indicated
by a measuring instrument or measuring system, or values represented by a material measure or a reference
material, and the corresponding values realized by standards
NOTE 1 The result of a calibration permits either the assignment of values of measurands to the indications or the
determination of corrections with respect to indications.
NOTE 2 A calibration may also determine other metrological properties such as the effect of influence quantities.
1
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NOTE 3 The result of a calibration may be recorded in a document, sometimes called a calibration certificate or a calibration
report.
[6]
[VIM]
4 Symbols and their meanings
Symbols and their meaning are given in Table 1.
Table 1 — Symbols and their meaning
Symbol Unit Meaning
a % Relative resolution of the force indicator of the testing machine
b % Relative repeatability error of the force-measuring system of the testing machine
f % Relative zero error of the force-measuring system of the testing machine
0
F N True force indicated by the force-proving instrument with increasing test force
N True force indicated by the force-proving instrument with decreasing test force
F'
F N True force indicated by the force-proving instrument with increasing test force, for
c
the complementary series of measurements for the smallest range which is used
F N Force indicated by the force indicator of the testing machine to be verified, with
i
increasing test force
¢F N Force indicated by the force indicator of the testing machine to be verified, with
i
decreasing test force
FF, N Arithmetic mean of several measurements of F and F for the same discrete force
i
i
F , F N Highest or lowest value of F or F for the same discrete force
i max i min i
F , F
max min
F N Force reading on the force indicator of the testing machine to be verified, with
ic
increasing test force, for the complementary series of measurements for the
smallest range which is used
F N Residual indication of the force indicator of the testing machine to be verified after
i0
removal of force
F N Maximum capacity of the measuring range of the force indicator of the testing
N
machine
2
g m/s Local acceleration due to gravity
n
q % Relative accuracy error of the force-measuring system of the testing machine
r N Resolution of the force indicator of the testing machine
v % Relative reversibility error of the force-measuring system of the testing machine
3
rkg/m Density of air
air
3
rkg/m Density of the dead weights
m
2
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5 General inspection of the testing machine
The verification of the testing machine shall only be carried out if the machine is in good working order. For this
purpose, a general inspection of the machine shall be carried out before calibration of the force-measuring system
of the machine (see annex A).
NOTE Good metrological practice requires a calibration run prior to any maintenance or adjustments to the testing
machine.
6 Calibration of the force-measuring system of the testing machine
6.1 General
This calibration shall be carried out for each of the force ranges used and with all force indicators employed. Any
accessory devices (e.g. pointer, recorder) which may affect the force-measuring system shall, where used, be
verified in accordance with 6.4.6.
If the testing machine has several force-measuring systems, each system shall be regarded as a separate testing
machine. The same procedure shall be followed for double-piston hydraulic machines.
The calibration shall be carried out using force-proving instruments with the following exception. If the force to be
verified is below the lower limit of the smallest capacity force proving device used in the calibration procedure, use
known masses.
When more than one force-proving instrument is required to calibrate a force range, the maximum force applied to
the smaller device shall be the same as the minimum force applied to the next force-proving instrument of higher
capacity. When a set of known masses is used to verify forces, the set shall be considered as a single force-proving
instrument.
The calibration should be carried out with constant indicated forces, F. When this method is not feasible, the
i
calibration may be carried out with constant true forces.
NOTE 1 Calibration may be carried out with a slowly increasing force. The word "constant" signifies that the same value of F
i
(or F) is used for the three series of measurements (see 6.4.5).
The instruments used for the calibration shall have a certified traceability to the international system of units.
The force-proving instrument shall comply with the requirements specified in ISO 376. The class of the instrument
shall be equal to or better than the class for which the testing machine is to be calibrated. In the case of dead
weights, the relative error of the force generated by these weights shall be less than or equal to 6 0,1 %.
NOTE 2 The exact equation giving the force, F, in newtons, created by the dead weight of mass m, in kilograms, is:
Ørø
air
Fm=-g 1 (1)
nŒœ
rmºß
This force can be calculated using the following approximate formula:
F = mg (2)
n
The relative error of the force can be calculated, using the formula:
DF D Dg
m n
=+ (3)
Fm g
n
3
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6.2 Determination of the resolution
6.2.1 Analogue scale
The thickness of the graduation marks on the scale shall be uniform and the width of the pointer shall be
approximately equal to the width of a graduation mark.
The resolution, r, of the indicator shall be obtained from the ratio between the width of the pointer and the centre-to-
centre distance between two adjacent scale graduation marks (scale interval). The recommended ratios are 1:2, 1:5
or 1:10, a spacing of 2,5 mm or greater being required for the determination of one-tenth of a scale division.
6.2.2 Digital scale
The resolution is taken to be one increment of the count of the numerical indicator, provided that when the
instrument is unloaded and the motors and controls system are operating, the indication does not fluctuate by more
than one increment.
6.2.3 Variation of readings
If the readings vary by more than the value previously calculated for the resolution (with the calibration of the force-
indicating instrument unloaded and with the motor and/or drive mechanism and control on for determining the sum
of all electrical noise), this resolution, r, shall be deemed to be equal to half the range of fluctuation plus one
increment.
NOTE 1 This only determines the resolution due to system noise and does not account for control errors, i.e. hydraulic
machines.
NOTE 2 For auto-ranging machines, the resolution of the indicator changes as the resolution or gain of the system changes.
6.2.4 Unit
The resolution, r, shall be expressed in units of force.
6.3 Prior determination of the relative resolution of the force indicator
The relative resolution, a, of the force indicator is defined by the relationship :
r
a=· 100 (4)
F
where
r is the resolution defined in 6.2;
F is the force at the point under consideration.
The relative resolution shall be determined at each calibration point and shall not exceed the values given in Table 2
for the class of machine being verified.
6.4 Calibration procedure
6.4.1 Alignment of the force-proving instrument
Mount tension force-proving instruments in the machine in such a way as to minimize any effects of bending
(see ISO 376). For the alignment of a force-pr
...
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