1、April 2016 English price group 6No part of this translation may be reproduced without prior permission ofDIN Deutsches Institut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany,has the exclusive right of sale for German Standards (DIN-Normen).ICS 07.040; 17.180.30!%Q0“2469713www.di
2、n.deDIN ISO 12858-1Optics and optical instruments Ancillary devices for geodetic instruments Part 1: Invar levelling staffs (ISO 12858-1:2014),English translation of DIN ISO 12858-1:2016-04Optik und optische Instrumente Zubehr fr geodtische Instrumente Teil 1: Przisions-Nivellierlatten (Invarlatten)
3、 (ISO 12858-1:2014),Englische bersetzung von DIN ISO 12858-1:2016-04Optique et instruments doptique Equipements annexes pour les instruments godsiques Partie 1: Mires de nivellement en invar (ISO 12858-1:2014),Traduction anglaise de DIN ISO 12858-1:2016-04SupersedesDIN 18717:1996-11www.beuth.deDocum
4、ent comprises 8 pagesDTranslation by DIN-Sprachendienst.In case of doubt, the German-language original shall be considered authoritative.04.16 A comma is used as the decimal marker. Contents PageNational foreword 3Introduction 41 Scope . 52 Normative references 53 Terms and definitions . 54 Design 5
5、5 Invar scale strip . 56 Scale and scale numbering . 66.1 Classical staff 66.2 Staffs for digital levels . 67 Zero-point error 78 Baseplate 79 Accessories . 710 Circular level . 711 Designation and marking 7Annex A (informative) Examples of Invar levelling staffs . 8DIN ISO 12858-1:2016-04 2 DIN ISO
6、 12858-1:2016-04 3 National foreword International Standard ISO 12858-1:2014, Optics and optical instruments Ancillary devices for geodetic instruments Part 1: Invar levelling staffs, has been adopted in this standard without any modification. ISO 12858-1:2014 has been prepared by Technical Committe
7、e ISO/TC 172 “Optics and photonics”, Subcommittee SC 6 “Geodetic and surveying instruments” (Secretariat: SNV, Switzerland). The responsible German body involved in its preparation was DIN-Normenausschuss Bauwesen (DIN Standards Committee Building and Civil Engineering), Working Committee NA 005-03-
8、04 AA Geodtische Instrumente und Gerte. This document supersedes DIN EN 18717:1996-11. Attention is drawn to the possibility that some elements of this document may be the subject of patent rights. DIN and/or DKE shall not be held responsible for identifying any or all such patent rights. ISO 12858
9、consists of the following parts, under the general title Optics and optical instruments Ancillary devices for geodetic instruments: Part 1: Invar levelling staffs Part 2: Tripods Part 3: Tribrachs It is intended to adopt all ISO Standards of ISO/TC 172/SC 6 as German national standards. The content
10、of ISO 12858-1 corresponds in substance to that of DIN 18717, since the first version of the ISO Standard published in 1999 was prepared on the basis of DIN 18717 with the active participation of German experts. Annex A of this part of ISO 12858 is for information only. For the International Standar
11、ds referred to in this standard there are (as yet) no national standards available. Amendments This standard differs from DIN 18717:1996-11 as follows: a) three different classes for the coefficient of thermal expansion have been introduced; b) three different classes for the graduation precision ha
12、ve been introduced; c) code staffs are specifically mentioned. Previous editions DIN 18717: 1961-11, 1977-10, 1996-11 IntroductionThe ISO 12858 series consists of several parts which detail specifications for ancillary devices to be used with geodetic instruments in surveying. This part of ISO 12858
13、 specifies requirements for Invar levelling staffs.Additional parts, covering other ancillary devices, may be added to ISO 12858 as the need arises.DIN ISO 12858-1:2016-04 4 Optics and optical instruments Ancillary devices for geodetic instruments Part 1: Invar levelling staffs1 ScopeThis part of IS
14、O 12858 specifies the most important requirements of Invar levelling staffs used in geodesy and industry for precise measurement of heights in combination with either an optical-mechanical level equipped with a parallel plate micrometre, or a digital level of comparable precision.It is applicable to
15、 classical staffs with graduation lines and numbering; staffs used in digital levelling with code patterns.NOTE The measurement uncertainty of the height differences depends on a multitude of influencing factors of the whole measuring system including the levelling instruments.This part of ISO 12858
16、 is not applicable to the detailed design and construction of Invar levelling staffs (e.g. materials, handles, fixing points for the struts, fixing of the Invar strip and of the circular level), which may be selected by the manufacturer as appropriate.2 Normative referencesThe following documents, i
17、n whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 9849, Optics and optical instr
18、uments Geodetic and surveying instruments Vocabulary3 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 9849 apply.4 DesignInvar levelling staffs are normally manufactured in nominal lengths of 2 m or 3 m. However, other alternative lengths may be adopted
19、.The detailed design and construction are left to the manufacturer.Examples of Invar levelling staffs are shown in Annex A.5 Invar scale stripThe Invar strip carrying the scale is classified in Table 1.DIN ISO 12858-1:2016-04 5 Table 1 Classification of Invar stripClassification of Invar strip A B C
20、Coefficient of thermal expansion | 0,5 106K1| 1,0 106K1| 1,5 106K1K is the SI unit of temperature in KelvinThis classification may be used to specify the quality of the Invar strip.6 Scale and scale numbering6.1 Classical staffThe Invar scale strip on levelling staffs may be equipped with one or two
21、 parallel sets of scales. The scale marks shall be sharp, parallel and of equal thickness. The colours of the scale marks and of the scale numbering shall be of good contrast. In case of two parallel sets of scales, they shall be offset (staff constant, equal to the difference between the two opposi
22、te scale values), the value of which shall be indicated on the staff frame or on the Invar scale strip.The scale numbering shall be on the staff frame, adjacent to the lnvar scale strip. In the case of two parallel sets of scales, the scale numbering shall be placed adjacent to the respective scales
23、, on each side of the lnvar scale strip.The maximum deviation (MPE) of the distance between any two scale marks shall not exceed the value specified in Table 2:Table 2 Classification of scaleClass A B Cadmissible deviationll+()0 015 1105,ll+()0,025 2,5105ll+()0055105,wherel is the admissible deviati
24、on (MPE), in millimetres, at 20 C;l is the distance, in millimetres, between any two scale marks or any two code pattern edges, which are 200 mm apart.6.2 Staffs for digital levelsThe scale of staffs for digital levels is different from classical staffs; it consists of a sequence of code patterns.Th
25、e admissible deviation for the scale of code staffs shall be compatible with Table 2.ll l=MS(1)wherelMis the measured value under a test;lSis the standard value by designing of manufacturers.The test should be accomplished by a special measuring machine.N1)National footnote: To be understood as a re
26、commendation. N1)DIN ISO 12858-1:2016-04 6 7 Zero-point errorThe measurement to determine this difference shall be made parallel to the staff length axis and perpendicular to the baseplate, at 20 C. The zero-point error shall not exceed 0,05 mm . Provision for adjusting the zero-point shall be made
27、.8 BaseplateThe baseplate shall have on its lower side a hardened stainless steel plate. The flatness deviation of the plate shall not exceed 0,02 mm. The baseplate shall be perpendicular, within 5, to the staff length axis.9 AccessoriesAt a suitable position on the staff frame, two foldable handles
28、 and fittings for struts shall be provided. Heat insulating materials should be selected for the handle or handles jacket.The alternative use of a centring ring at the baseplate should be possible.10 Circular levelA circular level having an (usable) indicating range of 15 5 shall be fixed to the bac
29、kside of the levelling staff.11 Designation and markingThe marking shall indicate at least the following data on the backside of the levelling staff: the name or trademark of the manufacturer (or responsible supplier); the individual identification number (serial number).The staff may be marked addi
30、tionally on the back with the designation as shown below for the example of a precision levelling staff of 2 m length:Table 3 Example designation of Invar levelling staff1 2 3 4 5Invar levelling staff ISO 12858-1 2 B B1: description2: International Standard number3: nominal length (m)4: classificati
31、on of Invar strip5: classification of scale (l)N2)National footnote: 0,05 mm is understood to mean the zero-point error as an amount. N3)National footnote: The adjustment shall preferably be carried out by the manufacturer. N2)N3)DIN ISO 12858-1:2016-04 7 Annex A (informative) Examples of Invar leve
32、lling staffsKey1 baseplate 4 scale(s)2 staff frame 5 scale numbering3 Invar scale stripNOTE Dimensions, scale numbering and scale interval are left to the manufacturers discretion.Figure A.1 Examples of Invar levelling staffsN4)National footnote: The numerical values given in the figure are dimensions in millimetres. “Ra 1,6” is the roughness, in m. N4)DIN ISO 12858-1:2016-04 8
