1、Designation:F204600(Reapproved 2017)An American National StandardStandard Specification forTachometers,Various1This standard is issued under the fixed designation F2046;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last
2、 revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.This standard has been approved for use by agencies of the U.S.Department of Defense.1.Scope1.1 This specification covers various tachomet
3、ers capable ofmeasuring rotational shaft speed.1.2 Special requirements for tachometer types used in navalshipboard applications are included in Supplement S1.1.3 The values stated in SI units are to be regarded asstandard.The values given in parentheses are mathematicalconversions to inch-pound uni
4、ts that are provided for informa-tion only and are not considered standard.1.4 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Re
5、com-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D3951 Practice for Commercial Packaging3.Terminology3.1 Definitions:3.1.1 SI(Le Systeme International dUnites)Units,nunitsof measurement recognized by the Comite I
6、nternational desPoids et Mesures(CIPM).3.1.2 tachometer,nan instrument capable of generating,transmitting,and indicating information or signal that can beconvened into a function of rotational speed.4.Classification4.1 Design TypesThe following are among the types oftachometers available:(1)Centrifu
7、gal;(2)Centrifugal,flexible drive;(3)Chonometric;(4)Electrical,alternating current(ac)voltage responsive,direct drive;(5)Electrical reactance;(6)Electrical,magnetovoltmeter,direct drive;(7)Electrical,magnetovoltmeter;(8)Frequency responsive,electrical control box andvoltmeter,direct drive;(9)Frequen
8、cy sensitive,electrical,nonrotating magneticpickup,direct drive,consists of a magnetic pickup,transducer,and indicator;(10)Photoelectric;(11)Digital contact;(12)Centrifugal,flexible drive;and(13)Vibrating resonant reed.5.Ordering Information5.1 The buyer shall provide the manufacturer with all of th
9、epertinent application data in accordance with the acquisitionrequirements,5.2.5.2 Acquisition RequirementsAcquisition documents shallspecify the following:(1)Title,number,and date of this specification;(2)Quantity of tachometers required;(3)Range;(4)Manufacturers part number;(5)When qualification i
10、nspection is required;(6)Final disposition of qualification test samples;(7)Type of electrical connection;(8)Mounting method;(9)Environmental requirements;(10)Materials;(11)Size and weight restrictions;(12)Critical service life requirements;(13)Performance requirements;(14)Surface finish requirement
11、s;(15)Cleaning requirements;(16)When certification is required;(17)Marking requirements;(18)Packaging requirements;and(19)Preservation requirements.1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.1
12、0 onElectrical.Current edition approved Aug.1,2017.Published August 2017.Originallyapproved in 2000.Last previous edition approved in 2011 as F2046 00(2011).DOI:10.1520/F2046-00R17.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.F
13、or Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally
14、recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 6.Materials and Manufacture6.1 Material SelectionThe material
15、s for all parts shall beselected for long-term compatibility with the environment inwhich the tachometer will be installed or used.6.2 Material InspectionThe manufacturer shall be respon-sible for ensuring that materials used are manufactured,examined,and tested in accordance with the specifications
16、 andstandards as applicable.7.Physical Properties7.1 Size and WeightThe buyer may have intended appli-cations where size and weight are limited.Size and weightlimitations shall be specified in the acquisition requirements.8.Performance Requirements8.1 Service LifeThe buyer may have a minimum specifiedservice life requirement.Critical service life requirements shallbe specified in the acquisition requirements.8.2 Tachometer PerformancePerformance tolerances areusually specified in percentage of r
