ASTM_F_1755M_-_96_2012e1.pdf

Designation:F1755M96(Reapproved 2012)1An American National StandardStandard Specification forSolid State Bargraph Meters for Shipboard Use Metric1This standard is issued under the fixed designation F1755M;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.1NOTEReapproved with editorial changes in October 2012.1.Scope1.1 This specification provides the requirements for design,construction,performance,and testing of solid state bargraph-type indicating meters.1.2 The solid state bargraph meters covered by this speci-fication are intended for use in shipboard applications ofelectrical measurement.This specification covers the require-ments and quality assurance provisions for solid state,panel-type(edgewise),andrectangularswitchboard-typeinstruments,which use light-emitting diodes(LEDs)for bar-graph indication and optional digital displays.1.3 This specifications requirements may be invoked forspecialized measurement applications where another quantity,for example,position,weight,concentration of a trace elementin an atmosphere sample,and so forth,is converted to electricalenergy for display and measurement.Special dial markingsshall be specified for such cases.1.4 The values stated in metric units are to be regarded asthe standard.The values given in parentheses are for informa-tion only.2.Referenced Documents2.1 ASTM Standards:2B117 Practice for Operating Salt Spray(Fog)ApparatusD3951 Practice for Commercial PackagingF1166 Practice for Human Engineering Design for MarineSystems,Equipment,and Facilities2.2 Federal Specifications:TTE529 Enamel,Alkyd,Semigloss,Low VOC Content32.3 Federal Standards:H28 Screw Thread Standards for Federal Services33.Terminology3.1 Definitions of Terms Specific to This Standard:3.1.1 accuracy,nthe accuracy is a number that defines thelimit of errors expressed as a percentage of full-scale value.3.1.2 center-zero meter,nmeter with display mode char-acterized by a sequentially illuminated string of LEDs startingat the center scale zero position and extending in eitherdirection from zero,proportional to the polarity and magnitudeof the input signal.3.1.3 dual bargraph display,ntwo completely indepen-dent bargraph displays included in a single enclosure.3.1.4 end-scale value,nthe value of the actuating electri-cal quantity that corresponds to end scale indication.Whenzero is not at the end or at the electrical center of the scale,thehigher value is used.See Table 1.3.1.5 end-zero meter,nmeter with display mode charac-terized by a sequentially illuminated string of LEDs startingfrom a zero point,normally at the left for switchboard-stylemeters or horizontally installed edgewise meters,or the bottomof vertically installed edgewise meters,that extends in thedirection of full-scale value.3.1.6 full-scale value,nfull-scale value is the largest valueof the actuating electrical quantity that can be indicated on thescale.For instruments with zero between the ends of the scale,the full-scale value is the arithmetic sum of the values of theactuating electrical quantity corresponding to the two ends ofthe scale.3.1.7 response time,nthe response time is the time re-quired for the indicating means to display a new value after astep change has occurred in the measured quantity to a newconstant value.3.1.8 scale division,na scale division is the incrementbetween the centers of two consecutive scale marks.Thenumber of scale marks is one more than the number of scaledivisions.For example,10 scale divisions require 11 scalemarks.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 Oct.1,2012.Published November 2012.Originallyapproved in 1996.Last previous edition approved in 2007 as F1755M-96(2007).DOI:10.1520/F1755M-96R12E01.2For 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.3Available from Standardization Documents Order Desk,Bldg.4 Section D,700Robbins Ave.,Philadelphia,PA 191115098,ATTN:NPODS.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.1.8.1 linear scale divisions,nlinear scale divisions arescale divisions that are spaced an equal distance apart and ofthe same value,for example,scale divisions spaced 5 A aparton a 100A meter.3.1.8.2 nonlinear scale divisions,nnonlinear scale divi-sions are scale divisions of the same value spaced an unequaldistance apart.3.1.9 scale length,nthe scale length is the length of thepath described by the pattern of the LEDs in moving from oneend of the