Noise measurement methods for printing, paper converting, paper making machines and auxiliary equipment - Accuracy grades 2 and 3

This standard specifies all the information necessary to carry out efficiently and under standardized conditions the determination, declaration and verification of airborne noise emission from printing and paper converting machines covered by the EN 1010 series and from paper making and finishing machines covered by the EN 1034 series. It specifies noise measurement methods and installation and operating conditions to be used for the test. This standard applies to those machines listed in the normative annexes A to J. The principles of this noise test code should be applied as far as possible also for the determination of noise emission of machines and machine parts not listed in the normative annexes A to J. In such cases, all information relating to assembly, installation and operating conditions as well as the arrangement of work stations should be recorded and reported in the test report. Noise emission characteristics include emission sound pressure levels at work stations and the sound power level. Declared noise emission values permit comparison of printing and paper machines on the market. The use of this noise test code ensures the reproducibility of the determination of the characteristic noise emissions within specific limits. These limits are determined by the accuracy grade of the noise measuring method used. Noise measurements specified by this standard are carried out by the engineering method (accuracy grade 2) and the survey method (accuracy grade 3).

Geräuschmessverfahren für Druck- und Papierverarbeitungs-, Papierherstellungs- und Ausrüstungsmaschinen - Genauigkeitsklassen 2 und 3

Diese Norm enthält alle Festlegungen, die erforderlich sind, um die Ermittlung, Kennzeichnung und Nachprüfung
von Luftschallemissionen an den durch die Reihe EN 1010 abgedeckten Druck- und Papierverarbeitungsmaschinen
und den durch die Reihe EN 1034 abgedeckten Maschinen der Papierherstellung
und Ausrüstung effektiv und unter einheitlichen Voraussetzungen durchführen zu können. Die Norm
beschreibt die Lärmmessverfahren sowie die Betriebs- und Installationsbedingungen für die Geräuschmessung.
Diese Norm bezieht sich auf die Maschinen, die in den normativen Anhängen A bis J aufgeführt sind. Auch
zur Bestimmung der Geräuschemission von Maschinen oder Maschinenteilen, die nicht in den normativen
Anhängen A bis J aufgeführt sind, sollten die Grundsätze dieser Geräuschmessvorschrift so weit wie möglich
angewendet werden. In diesem Fall sollten alle Informationen über Aufstellungs-, Befestigungs- und
Betriebsbedingungen und die Anordnung der Arbeitsplätze dokumentiert und im Ergebnisbericht angegeben
werden.
Zu den charakteristischen Geräuschemissionswerten gehören Emissons-Schalldruckpegel am Arbeitsplatz
sowie der Schallleistungspegel. Die angegebenen Geräuschwerte ermöglichen den Vergleich der am Markt
befindlichen Druck- und Papiermaschinen.
Die Anwendung dieser Geräuschmessvorschrift gewährleistet die Reproduzierbarkeit der Bestimmung der
charakteristischen Geräuschemissionswerte innerhalb genau festgelegter Grenzen. Diese Grenzen werden
durch die Genauigkeitsklasse des Geräuschmessverfahrens festgelegt. Geräuschmessungen nach dieser
Norm entsprechen der Genauigkeitsklasse 2 oder der Genauigkeitsklasse 3.

Méthodes de mesurage du bruit émis par les machines d'impression, de transformation, de fabrication et de finition du papier - Classes de précision 2 et 3

La présente Norme spécifie toutes les informations nécessaires pour procéder efficacement et dans des conditions normalisées à la détermination, la déclaration et la vérification des émissions sonores aériennes des machines destinées à l'impression et à la transformation du papier qui font l'objet des séries EN 1010 ainsi que des machines destinées à la fabrication et à la finition du papier traitées par les séries EN 1034. La Norme spécifie les méthodes de mesurage des émissions sonores, ainsi que les conditions de fonctionnement et de montage qui doivent être utilisées lors de l'essai.
La présente Norme s’applique aux machines énumérées dans les annexes normatives A à J. Pour les machines non énumérées dans ces annexes, l’émission sonore doit être autant que possible déterminée selon les principes de ces prescriptions de mesurage du bruit. Dans ce cas, toutes les informations relatives aux conditions d’installation, de montage et de fonctionnement ainsi que l’emplacement des postes de travail doivent être relevées et consignées dans le rapport d’essai.
Les valeurs d'émission sonore comprennent le niveau de pression acoustique d'émission aux postes de travail et le niveau de puissance acoustique. Les valeurs d’émission sonore déclarées permettent de comparer les différentes machines graphiques et papetières en présence sur le marché.
L'utilisation de ce code d'essai acoustique garantit la reproductibilité de la détermination des valeurs d'émission sonore caractéristiques dans des limites spécifiées. Ces limites sont déterminées par la classe de précision de la méthode utilisée pour le mesurage de l'émission sonore. Les méthodes de mesurage acoustique spécifiées par la présente norme sont des méthodes d'expertise (classe 2) et des méthodes de contrôle (classe 3).

Metode za merjenje hrupa pri strojih za tiskanje, obdelavo in izdelavo papirja in dodatni opremi - Razreda točnosti 2 in 3

Ta standard opredeljuje vse informacije, ki so potrebne za učinkovito izvajanje pod opredeljenimi pogoji določevanja, deklariranja in preverjanja emisij hrupa, ki se prenašajo po zraku, pri strojih za tiskanje in obdelavo papirja, ki jih zajema serija EN 1010, ter strojih in opremi za izdelavo papirja, ki jih zajema serija EN 1034. Opredeljuje metode meritve hrupa ter pogoje namestitve in obratovanja, ki se uporabljajo pri preskusu. Ta standard velja za stroje, navedene v normativnih dodatkih od A do J. Načela preskusne kode hrupa je treba uporabljati, kolikor je to mogoče, tudi za določevanje emisij hrupa strojev in delov strojev, ki niso našteti v normativnih dodatkih od A do J. V takih primerih je vse informacije, ki se nanašajo na pogoje sestavljanja, namestitve in obratovanja, kot tudi ureditev delovnih postaj, treba evidentirati in o njih poročati v poročilu o preskusu. Značilnosti emisij hrupa vključujejo ravni emisije zvočnega tlaka na delovnih postajah in raven zvočne moči. Nazivne vrednosti emisij hrupa omogočajo primerjavo strojev za tiskanje in papir na trgu. Uporaba te preskusne kode hrupa zagotavlja obnovljivost določevanja značilnih emisij hrupa znotraj posebnih omejitev. Te omejitve so določene z razredom točnosti uporabljene metode merjenja hrupa. Meritve hrupa, opredeljene v tem standardu, se izvajajo z inženirsko metodo (razred točnosti 2) in metodo analize (razred točnosti 3).

General Information

Status
Published
Publication Date
08-Apr-2010
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
22-Mar-2010
Due Date
27-May-2010
Completion Date
09-Apr-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Geräuschmessverfahren für Druck- und Papierverarbeitungs-, Papierherstellungs- und Ausrüstungsmaschinen - Genauigkeitsklassen 2 und 3Méthodes de mesurage du bruit émis par les machines d'impression, de transformation, de fabrication et de finition du papier - Classes de précision 2 et 3Noise measurement methods for printing, paper converting, paper making machines and auxiliary equipment - Accuracy grades 2 and 385.100Oprema za papirno industrijoEquipment for the paper industry37.100.10Reprodukcijska opremaReproduction equipment17.140.20Emisija hrupa naprav in opremeNoise emitted by machines and equipmentICS:Ta slovenski standard je istoveten z:EN 13023:2003+A1:2010SIST EN 13023:2004+A1:2010en,fr01-maj-2010SIST EN 13023:2004+A1:2010SLOVENSKI
STANDARD



SIST EN 13023:2004+A1:2010



EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13023:2003+A1
March 2010 ICS 17.140.20; 37.100.10; 85.100 Supersedes EN 13023:2003English Version
Noise measurement methods for printing, paper converting, paper making machines and auxiliary equipment - Accuracy grades 2 and 3
Méthodes de mesurage du bruit émis par les machines d'impression, de transformation, de fabrication et de finition du papier - Classes de précision 2 et 3
Geräuschmessverfahren für Druck- und Papierverarbeitungs-, Papierherstellungs- und Ausrüstungsmaschinen - Genauigkeitsklassen 2 und 3 This European Standard was approved by CEN on 25 March 2003 and includes Amendment 1 approved by CEN on 7 February 2010.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 13023:2003+A1:2010: ESIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 2 Contents Page Foreword .41Scope .52Normative references .53Terms and definitions .64Description of machines .65Emission sound pressure level determination .66Sound power level determination .76.1General method .76.2Alternative method for large machines .77Assembly and installation conditions .78Operating conditions .79Measurement uncertainty .810Information to be recorded .811Information to be reported .812Declaration and verification of noise emission values .9Annex A (normative)
Machines for processing raw material . 10Annex B (normative)
Machines for the preparation of wood pulp . 11Annex C (normative)
Machines for the preparation of cellulose . 12Annex D (normative)
Machines for the preparation of stock . 13D.1Disintegrators . 13D.2Pulpers . 13D.3Refiners . 14D.4Hydrocyclones . 14D.5Vibration screens . 15D.6Pressure screens . 15D.7Chests . 15Annex E (normative)
Paper, board and de-watering machines . 16Annex F (normative)
Finishing machines . 17F.1Winders and slitters . 17F.2Sheeter-sorters, sheet cutters . 17F.3Calenders . 18F.4Coaters . 19F.5Conditioners . 19F.6Sheet packaging machines . 19F.7Reel packaging machines . 20Annex G (normative)
Machines for production of printing formes . 21Annex H (normative)
Printing presses . 22H.1Proofing presses. 22H.1.1Offset proofing presses . 22H.1.2Web-fed proofing presses for gravure and flexo-printing . 22H.2Sheet-fed printing presses . 23H.2.1Automatic platen machines . 23SIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 3 H.2.2Sheet-fed rotary printing presses . 23H.2.3Sheet-fed screen printing presses . 23H.3Tube printing machines . 24H.4Web-fed rotary printing presses . 24H.4.1Web-fed rotary printing presses — all printing methods (excluding: continuous form presses, combined label printing and punching machines) . 24H.4.2Continuous form printing presses . 25H.4.3Label printing and die cutting machines, combined . 25Annex J (normative)
Paper converting machines . 26J.1Bundling machines . 26J.2Bending and folding machines . 27J.2.1Bending, scoring and creasing machines rotary bending, grooving and buckling machines, scoring and creasing machines . 27J.2.2Sheet-fed folding machines . 27J.2.3Folding machines for sanitary items (web-fed) . 29J.3Binding and finishing machines . 29J.3.1Stitching, corner staying and inserting machines . 29J.3.2Collating, web joining and inserting machines . 30J.4Gluing machines and equipment . 32J.4.1Gluing machines, gluing equipment and auxiliary equipment for paper converting . 32J.4.2Gluing machines, gluing equipment and auxiliary equipment for cardboard processing . 33J.4.3Gluing machines, gluing equipment and auxiliary equipment for book production. 33J.5Paper bag, sack and envelope making machines for paper and foil . 34J.6Presses . 36J.6.1Presses for book binding . 36J.6.2Forming presses for paper, board and foil . 36J.7Cutting machines . 37J.7.1Sheet-fed cutting machines . 37J.7.2Rotary cutters . 38J.7.3Toilet paper winding machine, tissue winding machine . 38J.7.4Cutting machines for book making and paper, cardboard and foil processing . 39J.8Punching machines . 40J.8.1Punching machines for book production . 40J.8.2Punching machines for paper and cardboard converting . 40J.9Coating, finishing and drying equipment for paper, board and foil . 47J.9.1Coating and finishing machines . 47J.9.2Continuous flow dryers for paper, board and foil . 48J.10Corrugated board production machines . 49J.11Auxiliary equipment . 50J.11.1Pile processing machines . 50J.11.2Tube processing and finishing machines . 50J.11.3Jogging machines . 51J.11.4Bridging machines . 51J.11.5Back rounding machines . 52J.11.6Paper drills . 52J.12Production lines and equipment for production of school and office stationery . 53J.12.1Exercise book production lines . 53J.13Shredders for paper and cardboard . 53Annex ZA (informative)
!Relationship between this European Standard and the Essential Requirements of EU Directive 98/37/EC" . 54Annex ZB (informative)
!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC" . 55Bibliography . 56 SIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 4 Foreword This document (EN 13023:2003+A1:2010) has been prepared by Technical Committee CEN/TC 198 “Printing and paper machinery - Safety”, the secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by September 2010, and conflicting national standards shall be withdrawn at the latest by September 2010. This document includes Amendment 1, approved by CEN on 2010-02-07. This document supersedes EN 13023:2003. The start and finish of text introduced or altered by amendment is indicated in the text by tags!"Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). !For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this document." Annexes A to J are normative. This document contains a bibliography. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 5 1 Scope This standard specifies all the information necessary to carry out efficiently and under standardized conditions the determination, declaration and verification of airborne noise emission from printing and paper converting machines covered by the EN 1010 series and from paper making and finishing machines covered by the EN 1034 series. It specifies noise measurement methods and installation and operating conditions to be used for the test.
This standard applies to those machines listed in the normative annexes A to J. The principles of this noise test code should be applied as far as possible also for the determination of noise emission of machines and machine parts not listed in the normative annexes A to J. In such cases, all information relating to assembly, installation and operating conditions as well as the arrangement of work stations should be recorded and reported in the test report. Noise emission characteristics include emission sound pressure levels at work stations and the sound power level. Declared noise emission values permit comparison of printing and paper machines on the market. The use of this noise test code ensures the reproducibility of the determination of the characteristic noise emissions within specific limits. These limits are determined by the accuracy grade of the noise measuring method used. Noise measurements specified by this standard are carried out by the engineering method (accuracy grade 2) and the survey method (accuracy grade 3). 2 Normative references !The following referenced documents are indispensable for the application 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." !deleted text" !EN ISO 216:2007, Writing paper and certain classes of printed matter — Trimmed sizes — A and B series, and indication of machine direction (ISO 216:2007)" !EN ISO 3740:2000, Acoustics — Determination of sound power levels of noise sources — Guidelines for the use of basic standards (ISO 3740:2000)" EN ISO 3744:1994, Acoustics — Determination of sound power levels of noise sources using sound pressure — Engineering method in an essentially free field over a reflecting plane (ISO 3744:1994) EN ISO 3746:1995, Acoustics — Determination of sound power levels of noise sources using sound pressure — Survey method using an enveloping measurement surface over a reflecting plane for accuracy grade 3 (ISO 3746:1995) EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996) EN ISO 9614-1:1995, Acoustics — Determination of sound-power levels of noise sources using sound intensity — Part 1: Measurement at discrete points (ISO 9614-1:1993) EN ISO 9614-2:1996, Acoustics — Determination of sound-power levels of noise sources using sound intensity — Part 2: Measurement by scanning (ISO 9614-2:1996) EN ISO 11200:1995, Acoustics — Noise emitted by machinery and equipment — Guidelines for the use of basic standards for the determination of emission sound pressure levels at a work station and at other specified positions (ISO 11200:1995) SIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 6 EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Survey method for measurements accuracy grade 3 under operating conditions (ISO 11202:1995) EN ISO 11203:1995, Acoustics — Noise emitted by machinery and equipment — Determination of emission sound pressure levels at a work station and at other specified positions from the sound-power level
(ISO 11203:1995) EN ISO 11204:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Method requiring environmental corrections (ISO 11204:1995) 3 Terms and definitions For the purposes of this Error! Reference source not found., the following term and definition applies in addition to the definitions given in the basic standards for the determination of emission sound pressure levels at work stations and other specified positions (EN ISO 11200:1995, EN ISO 11202:1995, EN ISO 11203:1995 and EN ISO 11204:1995) and in the basic standards for the determination of sound power levels (EN ISO 3740:2000, EN ISO 3744:1995, EN ISO 3746:1995 and EN ISO 9614-1:1995 and ISO 9614-2:1996). 3.1 large machines large machines within the meaning of this standard are machines where the greatest linear dimension exceeds 15 m 4 Description of machines The machines described in this standard include the equipment or parts covered by the normative annexes A to J or as described in the measurement reports, which contribute significantly to noise emission. For machines not listed in the normative annexes A to J, a description of auxiliary devices shall be provided where these devices are required for the correct operation of the machines and are therefore subject to the noise measurement methods. 5 Emission sound pressure level determination The measuring points for determining the emission sound pressure level at work stations and other specified positions are defined in the normative annexes A to J. All microphone positions are at a height of 1,6 m above the floor or access level.
Emission sound pressure levels shall be determined in accordance with EN ISO 11204 (with accuracy grade 2). Where this standard is not applicable, EN ISO 11204 (with accuracy grade 3) or EN ISO 11202:1995 shall be applied. The test report shall state the reasons why it was not possible to apply a grade 2 method. Where measuring is made difficult due to strong environmental influences such as sound reflections from walls and high levels of noise from other sources, EN ISO 11203 (with accuracy grades 2 or 3) may be applied if the sound power level has been determined in accordance with EN ISO 9614-1 or EN ISO 9614-2. Where emission sound pressure levels are determined in frequency bands, EN ISO 11204 shall be applied. The work station should preferably be used as the measuring point or, if this cannot be defined, the point with the highest sound pressure level measured at a distance of 1 m from the machine surface and at a height of 1,6 m above the floor or access level. !The C-weighted peak emission sound pressure level (LpCpeak) shall be determined where this exceeds 63 Pa (130 dB in relation to 20 µPa)." SIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 7 6 Sound power level determination 6.1 General method !If at any workstation the A-weighted emission sound pressure level exceeds 80 dB(A) the sound power level has to be determined additionally. This shall be done in accordance with EN ISO 3744, EN ISO 9614-1 (with accuracy grade 2) or EN ISO 9614-2 (with accuracy grade 2)." Where these standards are not applicable, EN ISO 3746, EN ISO 9614-1 (with accuracy grade 3) or EN ISO 9614-2 (with accuracy grade 3) shall be used. The test report shall state the reasons why it was not possible to apply a grade 2 method for determining the sound power level. 6.2 Alternative method for large machines For large machines, instead of the sound power level, it is permissible to determine and declare emission sound pressure levels at specified measurement points around the machine.
Such measuring points are specified along a path around the machine at a height of 1,6 m above the floor or access level and at a distance of 1 m from the machine. They shall be spaced so that the difference in emission sound pressure levels between adjacent points does not exceed 5 dB(A). NOTE Where the emission sound pressure levels around the machine vary by less than 5 dB e.g. when the sound radiation is very uniform, measurements should be made at 4 characteristic positions at least. For determining the emission sound pressure level, the method described in clause 5 shall be used.
7 Assembly and installation conditions The machine shall be assembled and installed in accordance with the manufacturer's instructions. If the conditions of installation are not known or if several modes of installation are possible, the type of installation used for noise measurement shall be specified in the test report. The assembly and installation conditions of the machine shall be identical for determining both sound power levels and also emission sound pressure levels at the measuring points specified in the normative annexes A to J.
Care shall be taken that any electrical connections, piping or air ducts connected to the machine do not significantly increase noise emission. 8 Operating conditions Operating conditions with significant noise emission are stipulated in the normative annexes A to J. Operating conditions shall be identical for determining both the emission sound pressure level at the specified measuring points and also the sound power level. Where there are no operating conditions defined in the normative annexes A to J, it is understood that operating conditions with significance for noise emission do not exist. If the operating conditions specified in the annexes cannot be adhered to partly or completely, the operating conditions that differ shall be recorded and documented in the test report. There are basically two different types of operating conditions: a) Where the normal running of the machine leads to a constant noise emission, this operating condition shall be used for noise measurements. b) For variable operating conditions, either one or more typical operating conditions or one characteristic work cycle comprising, amongst other things, the time required for converting and finishing the product (printed sheet, folded box, book block etc.) shall be defined. SIST EN 13023:2004+A1:2010



EN 13023:2003+A1:2010 (E) 8 Where work cycles are used for measuring and fluctuations of the A-weighted sound pressure level occurring during such cycles exceed 5 dB(A), the cycles are divided into operational subcycles during which specific operating conditions exist, for example operation under no load or operation under full load. Where subdividing the work cycle into subcycles is not possible, the time averaged level LpA and, if required, LpCpeak shall be determined for the whole work cycle and be reported. On machines with varying applications (such as combined machines, production lines), separate noise measurements shall be taken for the specific applications intended in accordance with the annexes to this standard. The noise emission shall be measured, unless otherwise stated in the normative annexes A to J, with the machine operating at 100 % of the maximum speed specified by the manufacturer. 9 Measurement uncertainty The measurement uncertainty of the noise emission values will comply with the accuracy grade of the method applied. Accuracy grades are specified in the standards for determining emission sound pressure levels (see clause 5) and sound power levels (see clause 6). 10 Information to be recorded The information to be recorded covers all the technical requirements of the noise test code. Any deviations from the noise test code or from the basic standards upon which it is based are to be recorded together with the technical justification for such deviations. 11 Information to be reported The test report of the noise measurements shall include, the following information, in addition to the designation (see clause 12),
a) type, classification and technical data, dimensions, as well as manufacturer, machine serial number and year of manufacture of the machine tested; b) any installation and operating conditions relevant to noise emission during the test (see clauses 7 and 8) that are not specified in the normative annexes A to J; c) basic standards applied for the determination of the noise emission (see clauses 5 and 6), giving, where applicable, reasons for not using accuracy grade 2 methods; d) measurement result
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