ISO 12858-1:2014

INTERNATIONAL ISO
STANDARD 12858-1
Second edition
2014-08-01
Optics and optical instruments —
Ancillary devices for geodetic
instruments —
Part 1:
Invar levelling staffs
Optique et instruments d’optique — Equipements annexes pour les
instruments géodésiques —
Partie 1: Mires de nivellement en invar
Reference number
©
ISO 2014
© ISO 2014
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ii © ISO 2014 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Design . 1
5 Invar scale strip . 1
6 Scale and scale numbering . 2
6.1 Classical staff . 2
6.2 Staffs for digital levels . 2
7 Zero-point error . 3
8 Baseplate . 3
9 Accessories . 3
10 Circular level . 3
11 Designation and marking . 3
Annex A (informative) Examples of Invar levelling staffs . 4
Foreword
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electrotechnical standardization.
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The committee responsible for this document is ISO/TC 172, Optics and photonics, Subcommittee SC 6,
Geodetic and surveying instruments.
This second edition cancels and replaces the first edition (ISO 12858-1:1999), which has been technically
revised.
ISO 12858 consists of the following parts, under the general title Optics and optical instruments —
Ancillary devices for geodetic ins
...