ISO/TS 15855:2025

Technical
Specification
ISO/TS 15855
First edition
Copper, lead and zinc sulfide
2025-01
concentrates — Step-by-step
procedure for the testing of
static scales
Concentrés sulfurés de cuivre, de plomb et de zinc — Procédure
pas à pas pour les essais des bascules statiques
Reference number
© ISO 2025
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on
the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below
or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 General information . 1
5 Frequency of testing . . 1
6 Precision test procedures . 2
6.1 General .2
6.2 Determining the precision of weighbridges by replicate tests .2
6.3 Determining the precision of hopper scales by replicate tests .2
6.4 Determining the precision of platform scales by replicate tests .2
7 Calibration (bias and linearity test) procedures . 3
7.1 General .3
7.2 Calibration procedure using a single certified test weight .3
7.3 Calibration procedure using a set of certified test weights .3

iii
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.
The procedures used to develop this document and those intended for its further maintenance are described
in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the different types
of ISO document should be noted. This document was drafted in accordance with the editorial rules of the
ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and expressions
related to conformity assessment, as well as information about ISO’s adherence to the World Trade
Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 183, Copper, lead, zinc and nickel ores and
concentrates.
This first edition cancels and replaces ISO/TR 15855:2001, which has been technically revised.
The main changes are as follows:
— in 7.2 e), “a total approximately equal to half the scale capacity” has been changed to “a total approximately
equal to full-scale capacity less the certified weight”.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.

iv
Technical Specification ISO/TS 15855:2025(en)
Copper, lead and zinc sulfide concentrates — Step-by-step
procedure for the testing of static scales
1 Scope
This document specifies simple procedures to check the performance and calibration status of static scales.
The test sequence is applicable to routine applications, generating results which can be used to calculate
explicit scale performance parameters (precision, bias and linearity) in accordance with the relevant
formulae shown in ISO 12745.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 12745:2008, Copper, lead and zinc ores and concentrates — Precision and bias of mass measurement
techniques
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 12745:2008 apply.
ISO and IEC maintain terminology d
...