ASTM_F_2046_-_00_2011.pdf

Designation:F204600(Reapproved 2011)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 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 tachometers 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 as thestandard.The values given in parentheses are for informationonly.2.Referenced Documents2.1 ASTM Standards:2D3951 Practice for Commercial Packaging3.Terminology3.1 Definitions:3.1.1 SI(Le Systeme International dUnites)Unitsunits ofmeasurement recognized by the Comite International desPoids et Mesures(CIPM).3.1.2 tachometeran 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)Centrifugal;(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)Frequency 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 thepertinent 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 inspection 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 requirements;(15)Cleaning requirements;(16)When certification is required;(17)Marking requirements;(18)Packaging requirements;and(19)Preservation requirements.6.Materials and Manufacture6.1 Material SelectionThe materials 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,1This specification is under the jurisdiction of ASTM Committee F25 on Shipsand Marine Technology and is the direct responsibility of Subcommittee F25.10 onElectrical.Current edition approved April 1,2011.Published April 2011.Originallyapproved in 2000.Last previous edition approved in 2006 as F2046 00(2006).DOI:10.1520/F2046-00R11.2For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For 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 States1 examined,and tested in accordance with the specifications 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 range span.The followingperformance characteristics and environmental exposures mayor may not be important to each buyers intended application.(1)Accuracy,(2)Repeatability,(3)Damping,(4)Temperature,(5)Humidity,(6)Salt spray,(7)Vibration,(8)Shock,and(9)Electromagnetic interference(EMI).9.Workmanship,Finish,and Appearance9.1 Cleaning,Finish,and Appearance Any specialcleaning,surface finish,and appearance requirements shall bespecified in the acquisition requirements.10.Inspection10.1 Classification of InspectionsThe inspection require-ments specified herein are classified as follows:(1)Qualification testing and(2)Quality conformance testing.10.2 Qualification TestingQualification test requirementsshall be specified,where a