X r

cal ibr ' : r l io ' In te. r ,a l corr t ro l .s N, lcasur .e ' re ' t l lc l iab i l i tV

I) rcsett ler

l { . Sutrtrrrr.ajl l lectrorrics' l 'est & l)evelopnrent Ccntre

l)epartnrcnt o { ' I l l ectLonics / Sl 'eC DircctdlateGovcr.rrnrent ol ' Irrdia' l 'h i r uvar r rn iyur . (Ncar ,Lat t icc Br i r lgc,y

Chc r rna i 600 04 l , I nd ia

It, Subburaj,I l lect lonics"fcst &

I)tpcr t lttt l tors '

I ( . Ar"u lsc lv i , A. Yegi ranatharrDcvcloprr rcnt Ccntrc ( l j ' l 'DC), Chcr tna i

Abs t r " l c lI

r

, t

F

' l ' l tc t 'cseat clt torvart ls estintert i trg t lre l iglrt cal ibration iutervals ,for achievipg a targctl lreasurel l lctt l" rcl iabi l i ty of 90% for ecltr iprttetrt cal ibratecl, was i ir i t i l te4 at p' i-pi, Clrerrfai' i r r thc ycar 1995. Si r rcc ' t l tc t t , t l tc t la ta on the pc i for rn, , , , . " o f c<1Lr i1 l ruc" t . , . l i r r r , , i " , i i .accttnttt latccl in a clatatlelse. ' l ' l te

achicvetl rel ia[r i l i ty lor cach class olequil l 'eut is r le4uceclf i 'ottt t l te data col lcctct l ' Atl justtt tcttts o{ 'cal iblat ion intcrvals have becn ca'. iecl out twicebasct l t t l lo t l t l te ac l t ievet l re l iab i l i ty o f c lasses of er lu ipnrent . . l -he

adjustnre. t o f i . te^ ,a l isyiclding t lrc clesit:cd tesults. ' l 'he resLrlts corrl lnn that the intervals control t lre achievccl

l l le i lsLt rc l t le t tL re l iab i l i ty . l t is a lso foLrr td t l ra t l r rec is iou ureasr i r i r rg anc l ' test

ec lu ipurcpt(M&'iE) sttch as calibt 'ators ancl soPlrist icatccl equiprirent such as osci l losco'cs pcr.fbr. 'rbettcr t l tat l t l te low ctlst, low uccttt 'acy etluipurent. ' f l r is

rvork could be carriecl out easily arrclcorrcctly only bccitt tse of atttolt tat i t tg t lre clata col lection arrcl analysis. ' l 'o

sul l ' r ir t lreact iv i ty ' t l te cet t t re I tas a lso devc loped an appl icat ior r sof t rvare ent i t lec l "Cal ibrat ion ln terva l.Wizard - Clt l l r l t 98" i t t- l touse. ' l 'he

{ 'eatures oI thc softrvarc are also discussecl brief ly. ' l '5csoft\vare catt be ttsed acldit ionally for cal ibration laboratol 'y lnaltagente61. '1e

availabi l i ty ol^t l tc softwat'e is a great boott to cal ibration laboratories both in Irrr l ia ancl abroad fcrr car.,yingot t t ass igt t t l re t l t a t td i tc l j t ts t t t tc t t I o I ca l ib la t ion in terva ls on sc ient i f jc bas is auc l l .e i l ,c t io ' o ft l re ur rcer ta in ty of per lon l ta l tce of the M&' t '8 .

I (q ' \ \ /or t ls

Achievcc l rc l iab i l i ty , ad justnrer t t (o f in terva l ) , ass ignnrent (o f in ter -va l ) , ca l ibrat i6h,calibratidn i t t terval, cal ibration laborttory luanagcrl lent, erluipuietrt class, graphical userit t tcr[ace, i t t-toleratrce, l l tcasuretttettt rel iabi l i ty, rncasuring antl test equil lnrentltvt&t ' l i ) , o*t-,of- lo lel ance, l terlortrt al lce nreasure, l 'el iab i l i ty targct, tol elance l i r ir i ts.

l l

I ' r ' ca n r [ l I c

A paPer e l l t i t l cd "A 1 t l 'ac t i ca l ap l t toac l r lo r Ca l ib ra t ion In te rva l " was 1) resentec l by g re au t lo rsin the 1996 NCSL WorkshoP & Synrl losiunr l th:r t brought <)ut a siruple aucl easy tcri t t t l l lct t rel t t al lproaclt tor cal i t rrat iou i r i tcLval assignur",r t o,r , t acl just l le l t . Tle al lproaclraclvocatcd was also i t t tPlct trcntcd at L, ' fDC, Chcrrnaiwith a target,r- ,"our, t .u, ,r"pi rel iabi l i ty o{ '90o/o lo r the cq t r ipn ten t ca l ib ra tec l by thenr . ' fhc work was ip i t ia tec l on Apr i l 1 , 1995. 1 - l t cyItave classi f ied thc eqtt i l l t t tet t t leceived for cal ibrat ion into [e1 groults known. as classes.

' l '5e

descr ip t ion o [ t l le c lasses is g iveu in Append ix L They cont inued w i t5 t5e ex is t i r lg u . i fo . 'i ' te rva ls o f l2 rnonths fo r a l l r t l r c c lasses o f equ ipnre ' t ,

' l ' l t c cc t t t l ' c t v i t s t l t c t t . a t loPt i l rg a labc l i i rg sc l renrc w i l l r t l r rcc co lou ls uud per fg r . l ln rcc o f t5e

ccl t t i l t t t ret t t wns clcr ived usi t ig thc colour o{ ' thc labcl erwaldecl basecl op t5e status ol 'cal ibrat ion.

' i 'he Perfonttat tces oI the classes of ccluipnrent are apalyzecl at t le speci l iet l

per iocB al tc l h 'act iol t i t t - tolerartce is calcrr latecl lor eacl i c lnss.. ' f l re fr 'aot ion in-tolcra.ce is

cotrvcrtccl to rel iabi l i ty using l{el iabi l i ty ' l 'able2. l l 'hen t i re achieverl rel iabi l i ' ty is cor ' 'arcdwi th the ta rge t Le l iab i l i t y . ' l ' l t c

ac l r i cvcr l re l iab i l i t y w i l l be c i tScr equa l to o r less t5a ' o rtnore t l ta t r t l re spec i f i cc l ta rgc t . Wl tc r t t l re ac l r ieved re l iab i l i t y equa ls t le ta r .ge t , l re ' ' oacl j t tst t t r 'ert t is t t tade to the ct trrent i t r terval ol ' the class. Whcn i t exceecls the target, t le ' t l rei t t l 'crval is i t tcrcasccl nnd whcn i t is bclow thc talgct, thcp t6e i l terval is l .ed'ced, A'a lgor i t l rn t [o r ad j t rs tn lc l l t o I in te r t ,a ls baset l u l lon the resu l t o I t l re p rev igus i l te rva l a r ra lys isa t td t l te c t t r t ' c t t t a t ta lys is , was t levc lo l tcd . ' l ' l ro

a t l jus t r r rcp t o f i l te rva l i .e . t l re r .cduc t io r r o ri r rc rcase w i l l i r c in {e r -n rs o f rnor r t l rs . I

Data tvas co l lec tec l o t l t l te p" r ,b r , t to , t . c o f ' t l t c cqu i l l rnent be fore anc l a f le r ca l ib ra t io l . A f te ro l le year o f acc t t t l t t t l t r t io t t o l - c la ta t l t c ac l r ieved re l iab i l i t y o f the equ ipurcu t c lasses wercarlalyzcd. ' l ' l le i t t tcr"vals in t 'csl lect of four classes r.vere recluced anrJ one class i 'creased,bascc l upon thc ach ieved re l iab i l i t y (Apper rd ix 3 ) .

I t sv isc t l l l gu l ' i th rn

I i t i r ther atralysis was carried out regardirrg the algorit lurr for adjustnreltt of iutervals. l '6ealgorithnr is rcf i t iecl and given in Appenclix 2. The fol lowipg cSalges Save beel ptacle to t5eprev ious a lgor i t l rn t :

The algorit l t t t t has beert sinrpl i f ied now. When the perfornrauce of t5e classes oI equiplrcptis poorer t l tatt expected, t l teu the interval is reduced by a rnonth. When the aclr ieveclrcl iabi l i ty trtcets t l te target, obviously the interval is left untl isturbecl. When t lre perforuralceis l le t ter t rv ice i .e , two analyses consecut ive ly t l ren, the in tcrva l is increased by a urouth.These_refirtetttettts wete tt tade to bring irr stabil i ty irr the interval adjustrnent progranmlc.

I tcv iscc l pc l ' [ornrancc nreasulc

Norv, t l lb centre h.as"rev ised i ts label ing schente wi th zr s ing le type of label that isaltpropriately rnar:kctl clepending upon the perfonuance of the equipmerit cluring calibration.Accordingly, ' the criterion to cletelnrine in-tolerance has also bsen rcvised.

tg .9.S ̂ JC.Sl Worksl ton & Svrnnosi t tn t

! r - t o l c l i r r r c c

' l 'hc ccluiPrt tct i t ot t t 'cceiPt is c lrccl ibcl bcf i i rc cal ibrat iorr [o scc wlretSer t5c 'erfornra'ce is

u ' i t l t i t t to le ra t tce . I f t l r c l te r fc l tu rar rce is w i t l r i r r [o le rauce, r ,v i t l r ou t any ad jus t rpe l t evcr rbe lo rc ca l ib ra t io t r , t l t c t t i t i s cor rs ide t ' c t l to be i r r - to le rancc . l f the c rpr ip r i rc l t rece ivc r l i s i r ro t t t -o [ - to lc ra t tce cont l i t ion i .e . t l r c per f i i l n rance is bcyor r r l s ta tec l to lc r -auce l i ' r i t s i l l ' uc o r ,n ro lc l ro in ts o Ica l ib la t ion , t l re r r t l r c rc a lc l rvo posq ib i l i i i es :

( l ,

b)

' l 'he c t lu ipntcr r t rvas

'f l tc cclu i l lurent n,i lsknor.vn.

i n- to lcrancc r lur ing t l re prev ious ca l ibrat io ,n.out -of ' - to lc ' i l l l cc or the l ler ' [onna'ce t lur i 'g last ca l ibrat ior r is nor

In t l rc for t t tcr case, t l tc e t l t t iPutcut wi l l be c lass i f icc l as out -of - to lerancc. Iq t5c la t ter 'cuse,

t l te ot r t -o [ - to lerat lce u ' i l l be ignot 'er l s ince i t is r ro t cer ta in t l ra t i t was lv i th in to lcra.cc i ' thel ) rcv lo l ' ts ca l ib |a t ion. I r l o t l ter wot ' t ls , t l tc cquiprnerr t wl r ic l r t ra ls i t io l f io tp i1- to lera.oo t . outoI to lerat tcc co l td i t io l t bct lvect t s t tcccss ivc ca l i t r r "a{ ions is on ly t reaLct l as out o I to lcr i i r rce l i r rt l r is pur 'posc.

Norv, t l tc to ta l f i "act io t t i t t - to lc t 'ar rcc rv i l l be courprr (c t l as per t l re fo l lowing; : .

I ; t ' ac t io r r I r r - t t l l c r i r r rcc -=

' l 'o tu l nunrber oI ' i r r - to lcrauce ecpr i l lnrcnt

( ' l 'o ta l r r r rn tbel in- to lcrancc - t ' l 'o t i r l nunrber . out_o[_to lcrance)

l 'he achicvcd lc l iab i l i ty fur a c lass can be foLrr r t l out f ionr thc f iact ior r in- to lerapce by.s i 'gI(el iabi l i ty ' l 'atr lc2, ' l ' l rc aclr icverl rel iab,i l i ty is co'r1rur"o *i ir , ' i --. ; lg;r ir l 'ycl,x autl rSqrra l lPropr ia te ly t l re t lcw i t t tc rva l is ass igr rc i l ls pcr lhc a lgor i t l rnr g iven in Apl tenc l lx 2 .

Cu r r cn t Scu ra r i u

Tl ie c l i ta was at ta fyzcd a l lc r l rvo years o l - t l re p lcv ious at l justnrcn l . i .e . on Apr i l l , 199g. ' l ]5eitrten'als i t t resl lcct ol-t lrc sit t t te loul classes hatl to be further reclucec.l by ope prore nro't5 asgiven ir l Appendix 3. Atldit iortal ly, thc pcrfornrance in respect of two , iror" g1"oups 6ad alsolal len below thc target attd l tcnce t lre iutervals of t lrese trvo classes wcre also icthr-.ed.

T'he perfol l l lal lcc clata {br t l tc otre year period i.e. l99B-99 is also givep i1 Appe.cl ix 3. l"heperforntattce i t t al l the six classes, where t lre irrtervals rvere recluced,

- ias i ' ' rovcrl

co l rs iderably rv l r i lc be l tcr ' l tc t [o t t t t i t tg c lersses cont inue to t leet t l re ta tget . ' l ' [e next i l r terva ladjtrstrr lctt l , wil l be Itradc ott ly after ottc nlore yc:rr siucc oui pol icy is to carry out irrtcr-valadjttsttt tetr l" ottce i tr 2'years. I3y that t inre i t is expectecl that the achieved rel iabi l i ty rvi l lapprodcl r t l re targc{ . in a l rnost a l I cases.

I r r [ c r : cnccs

'fhe clata l lrovicies a' lot of insight into the lrerfolruauce of Llre classes of ecluipruent. [rr9r1Appendix 3, t l re fo l lorv ing in ferences could be arr ived at :

. / ,

: 1

' [ ' l i t ' ce ot r t o I te t t c lasses a l 'e cot ts is tcnt ly nrect ing t l rc target re l i lb i l i ty wi t l r co 's tar ti r i t c r vn l o f l 2 ruo r r t l r s f o r . t hc l as t l bu r . yca i s .

Or le c lass t ta t t te ly osc i l loscol les Per fb l rn bet tcr l . I ran a l l o t l rer .c lasses, leat l i rg toet t l ta t tcet t re t t t o I t l lc i r r terva l to l3 nrorr ths. , l r r s l l i r .e oI t l re incr .eas ing i i r terva l , t l le c lasscoLtt i t tues to be t l ie best Perforrrrer uurintaini irg air r ichievcrl rel iabi l i ty ot95o/,, i i ,"; , ' i i ,"irr i t ial interval of l2 tnolrths is jLrsl" i f iet l [or foriy percent of the ipstrurnelt classes

For t rc lasscs I ) , C, D ar tc l [ , l lc r for t t tcd l roor ly wi th an i r r terva l o f l2 r lont l rs , E,vcn af lcrredt tc t io t t o{ ' i t t terva l to l0 t t ro t t t l rs , these c lasses d id not i rnprov" ,1 ; " l r , " j rcr ron l ra 'ces igni f icar l { ly l lowcvcr , wl te t t t l tcy l tar l l lcen rec luccr l to 9 rnont l rs , thc i r l ler for -prapcesarc

- [ rc t ter and ac l t ipved rc l iab i l i ty ' is ncar ly approacl r i r rg t l rc targct . t

l '1 ,1s, , t l , " i , .pcr fo ' rn : rnccs l l ray s tabi l izc wi t l , r ar r in tcr"va l o f 9 urorr ths,

' ihe c lasscs

| & G l rc t ' fo t ' t t tcd wcl l i r r t l re f i r 's t yca l anr l the i r in tcrva ls were pra iuta i lec l a t12 I t ro t t ths ' 13t r t , i r f t l rc s t tbset lucnt 2 years, the aol r ieved ro l iab i l i ty o f t lese c lasscs wcrr t

clowll to 85(%, lcircl ing to reductiotr ol ' intcn,als to l l nrontlrs. ' l 'he class G 6as i 'r1rr 'vcelIhc l lc t ' [or t l tancc agai t t to I t reet t l ie targct re l iab i l i ty and Class I r is in the verge oI rneet i r rg{ltc t irrgct. ' l ' l lere[bt 'c,

t l tese two classes nray. be able to aclr ievc t5c.t i-get wit l airi n t cn ,a l o f l 0 t o I I r non ths .

I ' l l t ts , t l tc l 'c are t l l tce catcgor ics of - inst runrcrr ts , wl lcn the per lbr .nrance is ar ra lyzed, .15cIIrsl ' category oIfour classes being on thc tr i l l ol ' the spectLir lr. T'he otlrcr four classes areat t l lc lower ettd irt Perlorttrattce ancl even t lrese classes wilI bc able to trr""t tn" i .rr*;|c l iab i l i ty a t rc t l t tcc t l i t t terva l o f g lnot t t l rs . ' l 'hc

othcr t rvo c lasscs l rave t ley l ic te i l r r icd iur .l lcrfort l tattce.

' l 'hcrefot 'e, assigtt irrg unifbrnr intervnls I 'or alt equiirntent i* , ioicor.rcct,

I t t t ray a lso bc t to tcd t l ta t the c lasses that n teet thc targct rc l iab i l i ty wi t6 a ' i ' terva l o l '9I t tont l ts t l t t ra t ion, cot ts t i t t t tc a tu i t lor l ror t ior r o I the cquipnrent r .ecc iver ] for ca l ibrat io l . .

At the sat t tc t iu tc , the.sophis t ic l tcd crpr i l rnrcr r t wi th l r igh accuracy, h igh corn l r lex i ty ar r t lt tsed ttt tdct ' control let l cttvirounrent, lral,e perfonuccl better ' , T5e low cost-equil i ' rerrtwhiclr are i tsccl in lactory f ioors attr l uttcorrtrcl l lerl environrnent wit lr lowcr accuracy arrt ll r rcc is ion, necd to be ca l ibratcd nrore l i -equent ly . I

' f l rc Class C is a Pc.cr t l iar casc. l t pcr ta i r rs to l ) fcssufe re la tc t l cquiprnerr t . I r r t l r is c l1ss,

t l te trt trt tber of eqtriprl tettt taltett into account [or.the calculation,^ are quite s'ral l ascottr l lared to Lhe ttutnber oI equipnrent cal iblated, since the specif icati ins wer.e 1oIavailablc for rttost. of t l te ecluipnrerrt aurl herrce no conclusion could be ar.r ivcd at wit lr,rcgard to the perforltratrce oIa large'proport ion of ecluipnrent fal l ing in the class. Sinri lar.'si tuation

l lrevails ir lso in Class C rvhiclr cousists of ternper"ature coptrol lers, se'sors a'dlelated instnrrnents, w[rere baLely 10,% of the etlui l tnrerit cal ibratcd rvere oir ly qupli f iedlor cQtlsicleratiott for r inalysis fol t lrc sanre reason. l lolvgver, t lr is is not t lre case withtnost of t l te otl ler grottps, rvltere a large polt ion oI erluipnretrt cal ibrate<l clual i fy toriuc lus ion in the in terva l analys is tas l<.

/999 l /C .S I Works l ton Rt Svrnnos i t t r t t l 1

I ' f l te wot 'k l tas lac i l i ta tc t l lneas lucnrc r r t o f re l iab i t i t y ac l r i cvcc l by t1c var ious c lasscs o l

c r l r r i p i r r c r r t .

. - l ' hc c i l cc t i ve ness o f t l r c a lgor i th r r r l ras a lso bccn conf l r .n rcd ,

' Abovc a l l , i t i s co t l { l t ' l t ted t l ra t ca l ib rn t io t t in tc rva l con t r r - r l s u re i l surcn len t r ' c t iab i l i t v o f ' t l re

, cqu i l tn rcn tca l ib ra tcc l .

C : r l ib ra t ion l r r tc l ' va l \ \ ' i z , i r r . t t - C : r l ln t 9 l l

' l ' l te cett t rc col l" l l l le l lcecl t l rc tvor l< by extcnr l ing t l re nvai lable Cornputcr Aiclct l Lutrrr .at ' r .y

Mal lagetrtenl ' (CALM) soft ivare. l t r ,vas also renl ized that" thcre is a need fol .a clet l icatecl'softrval 'c for cal ibrat ion i t t tcr-val I t tat tagcnrcut. ' l ' l rerc[orc, t5e ceutrc has- dcvelol led a

so f t tvare er r t i t led "Ca l ib ra t ion In te rva l Wiza ld - Ca l ln t 98" bascc l on the ' r i r i c ip lese t r t t t t c ia te t l i l r t l re l ra l )c r .

' l ' l r i s so{1wat .e i s us ing a tn re g ra l l l r i ca l user i l te r ' lace (GUl ) , r la l i i r rg

i t casy tb usc . ' l ' l t c

c t t t ' t c l t t vers ion is a s ta r rd -a lone so f t l va le , wh ich can be ins ta l le r l i ' al le t t t i t t tn I )C.

' l ' l l c so f lwa l ' c ad t l i t io r ra l l y 1 r rov ides f ac i l i t y fc r r rnar ragemcpt o Ica l i6 r .a t io r r jobs .' l ' he

Ica turcs o f t l t c so l l rvare n te g ivc r r i r r Appcr r t l i x z l . ' l ' l r c so l lware is ava i lab le {b r o t l rc r .labora tor ics . A l readf i t t t i t t - l to t tsc ca l i t r ra l io r r labora tory o I a lna jo r i r rc l t rs t ry 5as purc l rnser lt l rc sol ' l rvare fol t l rcrr t rse. t

I r t t t t r rc \ \ ' o r ' k

Wc w i l l co t t t i t r l te to co l lec t t l re da ta o t t t l r c per . fb ln rancc o f the ec lu i l t l rep t ca l iSra tcd . ' l ' l r c

s l lec t t " t t l t l o f i t t s t ru t l te t t t s recc i t 'ed is a lso Lr r r t l c rgo iug cont i r ruous " i rnug. ,

Ncver tSe less , t5cc lass i f i ca t io r r o Iequ i1 ; r t te t r t i r t to ten c lasscs has cc ln re to s tay . I t i s expec ted t l ra t t l re so f tg ,a r .ewi l l bc t tse t l by l l l a l l y o rg i tn iza t ions . lu suc l r a s i tua t io r r , a neec l . n iay a r ise to c lass i l y t5ci l lst t ' t t t r tet l ts accordi t tg to a utt i fortn ant l stanclarr l cr i ter ion. ' l 'he

adval iage of sta'4ardi iat io 'i s obv ious . I t rv i l l fac i l i ta te co l lec t ion o f n rore t la ta across the na t ion due to cxchar rgcbetrVcgn laborator ics, lcading to i tnproved conf ir lerrce in t l re clata col lected as rvel l asi t l te t ' r 'a ls ass ig r tcd . I t w i l l b r ing in shar i r rg o I r ro t on ly t la ta bu t a lso kno lv lcdge or t l repel ' lort t ratrcc oI Ll tc ecl t t i l t t t tet t t and l ix i rrg t l re r iglr t iptervals, so tSat t6erc is 'o 'ecd forad jus t rncn t o I i r r te rva ls

S r r n r r r rn l -1 '

In t l i is l la l ler, rve have lr l ldatct l t l ie i r r fornrat ion provi t lecl by rrs iu t f ie 1996 NCSL Wclr l<slro1;& Synr l ros i t t r l r . T l re rcsu l ts de l i ved conf i r 'n r t l i a t thc ca l ib ra t ion , in tc rva l co ' t ro lsI l lcasr l l 'enlent Lcl iabi l i ty achicvecl. ' l ' l rc

adjustt t rent by class r tre(hodology is a cost-cf fect iver l tet l tod. ar ld l ie l l ls i r t ' acl t ievettreut of thc desired rel iabi l i ty quickly. Tle leatures oIdedicatcd sof iware clevclopcd.by DfDC, Chennai lor cal i l r rat ion interval assigulnent artdadjtrstnrent wore also br ie{ ly discussed.

- l ' l i is software is a f i rst step for inrplerr ientat io ' of

cal ibrat ion intcrval at l j t tst t t tet t t progri l l l lnrc iu a systeruat ic nralper aud uat ior-r-wicle basis.

t o o o A / / - c I t A / ^ - L - t - ^ . - o . c . . , . - ^ ^ - : . . - , . - 5 -

I

A c k r r o r i l t ' t l g r r r r c l r I

' [ ' l t c i t t t t l t o t . s r v i s l t I o c x P t ' c s s t l i c i l ' s i t t c c r c t l r a r r l < s t o t l r c r i r c o l l c a g u c s a r r t l t l r c i r c l i e r r t s r v l r o

l tc l l rc t l t l r cnr in car ly i r rg o r r t t l r i s tas l< s r rcccss{ i r i l y .

l { c l t r c r r c t s : t

l ) I { S t r l r l r t r r . a j , l ( . A r t r l s c l v i & , t . \ ' c g r r a r u r t l r i l n , " A l , r ' a c t i c a l A p p r g a c l r f r r r C r r l i S r ; r t i ' ,I t t I c rva l " , I ' r ' occc t l ings r i l ' l l r c 1996 l . lC ]S l , \ \ i9 r f i s l r9p & S iy r r rpo" i l r r r , N( ]SL, I jSn .

2 ' ) I {cc r r r r r r rc ' r l c r l I ) r . , c t i cc l i l ,1 , NL-s1 . , (JSA, N. r ,c r r rbcr 1 .5 , i9g9 .

r

Clnss Descr ip t ionAppcnr l ix

t ,

d

q

/999 ruC.S! Wnrks .hon R Svntnn< i t tn t

ClassCodc

Clnss Nanre Il<; ri illlrrelr t Coverffi

A Cal ibrators & DMMsAbove 5 %Digit.

\-auorators ot ultcertanrty better lhan 100 ppnr,Dig i ta l Mul t i Meters (DMMs) wi rh c l isp lay o l5 %Digrt and above

B Digi ta l Metcr.s Digitnl Volt Metcrs, Arnriiffit/zDigit, Clamp Meters, 'l achonreters, DigiialVol tage / Currcr r t Sources.

C P ress u re-rel aterlInstrunrents

rressure Lrauge, l ,ressure ualibratBr.

D Power and EnergyMeters

wa[[ vleters, l j ,nergy Meters, power FactorMete ls .

E I tF Equil lnrent S i gnal Ceneratols, Frequeiicffiarrd IIF Ilt luiprrrcnI

F LCR Bi idgesT'enrpernti i' l ' f rerrrtorrreters. I

C ' l 'enr l leratur e Control leLs

l l Osc i l loscopcs Osci l loscopes,I Arralog Mcl.ers Analog Volt Meters, Arrr@

Meters, I- l igh Resistance Meters, I- lV Tester.s.j Environmental Cli tnlbels Tenrpelat ure ancl I-l unr i d ity ChantlierslFurLrnces

atrc l Ovens I 1

*l

JF

I

,

t

Cul ' l 'entIn te l 'vn l i r r

v0gl rc

l l .csult of lnst ir i tel v:r lnr rn lys i5

l lesult ofcrr l ' l ' c l l tnn n lys is

N'etv irrtel'vnlnss igned

(irr nrolrths)X Not k ow l l M'I' XX Not k owl l B't' x- lX Not k owl l Et' XX @ M1'X MT 13'f i X - l iY u'f u'f x- lX 111" I]T x- lX M1 Ii'f X

Il'f ET' XX lrT r11' ,x+1

N o t e :

All the etbot'e refers to clrtsses of in,slt'tttttertts ctttrl trcttfor itrclivirltrtl inslryttrettl,

I lev iscr l n lgor i thnr l i r r . n t l justnrent o f iu tc l .va ls

.Y - Cun'ettt ittterttal (iti rttonrhs) for tlte <:luss ctf M&I,li .I t T

[ , t r - f i ' leets lurgelBT - Ilelotv T'argetET' Exceerling T'arget .

@ - Ittlerval uru.itttcrined / reduce,d / ina.eusecl

I.

;

Appcnr l ix 2

t q a q A / / - q l l A / n r k c h n n R , Q r r t n n n c i r t m

I t c r fo r lnnr r re o l ' c l : rsses o [ e r ;u i ; r lnc l r l Ap l rc r r t l i x 3' l ' :u 'gc t l te l i : rb i l i t y ;90 'h

D r t n f o l ' t l r e p e r i o d A p r i l 1 9 9 5 - N , l l r . c h 1 9 9 6

a .

u

a

Alrr i l 1996 - N{:u'ch | 99tl

Ap r i l l 99B - N {n rch 1999

/999 /VCSL Worksltop & Sytnposiurn ( l

Cl r tss N o . o fI !11u ip lncn l .Cons i t l c rc t l

Ac l r i cvc t ll { e l i n b i l i ( 1 ,

( i l r ' X , )

I n te ryn l i r r\ /ugrre

Nen, It t tct"t, i t lAss igner l

tvcf . I .4 .199686 90 2 t2

t ) 1120 BO 2 l0C t 5 60 2 l0U r 4 t B5 I0l r l 7 90 z t2t tzl 90 2 l2U I r t5 90 ')

t2l - l 45 95 .) t3I 8( '5 75 L l 0

t t I 90 t2

Clnss No . o [l ir l u ip nrcn tCons ide l ' ed

Achicvet lI te l i lb i l i t1 ,

( i r r %r)

I l r t e rvn l i r r\ /ogu e

Nerv Iu terr , : r lAss igucd

rvef . | .4 .1 q9BA 205 90 12 l 1

I l L

il 1213 ( ) J 0 9U 1 1

J L 60 0 9I ) 3 t l l 70 0 9l 1 r00 90 az ')

I , 183 B5 2 II

G ?_02 ( ) J 2l - ll l t02 A5 lo 3 t 1

I t7 44 15 U ()

J 56 90 L l aI L

Class No. o f l l tp r ip lne l r (C ions idcrc t l

Ach ict ,ct l t tc l inbi l i ty( in ,X,)

I r t te rva l i l r Vogue

6 l 90 l2B 692 d ) 9(- 20 15 9ll l 3B BO 9E 40 95 t2IiI t32 85 l lL' 32 0 q

J - t l t

I I 1 a- ) l 95 , , l 3

I t 66 B5 9J l5 9t) t2

. ; .

I

r 9

?a

i

I

I

Appcnd ix 4I reaturcs of Cr l ibrat ion I r r tervn l Wiznrd - Cal ' ln t 98

0 Uselul for cal ibration laboratories, uranufacturers oI irrstruurents and even users ofinstrutni:nts

0 Easy to understanrl arrd use.0 Tt rc sof twi t t 'b e t rab les easy inrp lcnrerr ta t ion of ca l ibrat ion in terva l ass ignnrcnt l l lograrn of

a l l types of ca l ibrat ion laborator ies. , ,0 Laboratories can use this softwar"e for a widcly varying lneasurel l lent re.l iabi l i ty tar 'gcts

rangilrg l i"onr 70(% to 95o/o t lepending upon their unique requirement, " ' .0 ' fhey

can group the instruntents irrto arry nunrber of classes ,:

0 Assignilrg oI class [or each nrodel of equipnrenI has to be perfonnerl l iy nretrologists prauthorized lrersons only.

0 l 'he data catt be artalyze<l at f lexible intervals to suit unique needs of the lab,oratories, ,.0 The softwitre autortratical ly delernrines new intervnls, l . lowever, the laboratorics carr

have thc i r own nr in inrunr and ntax inrunr in lerva ls .0 l 'he softrvare also catr be usecl for Calibration Laboratory Managernent.0 ' l ' rue grapl r ica l uscr i r r ter faces, wi t l r ur i r r inrurr r typ i r tg necr ls .0 The 'software is t l tot:oughly tested by the Sollware ' l 'esting

& ' fr,aining , 'Laborator:y(ST' |L) o I EIDC, Chennai .

0 7 ty l rcs r : ( ' reporrs and l1 types of c lucr ics bui l t - in .0 Designed to serve as a repositor"y oI valuatrle data pertaining to perfonntlnce of

inst rur t rcnts .

, i ' 0 iDeveloptttent based ott worlc carriet l out at l i l 'Dc, Chennai and the RecornnreirdetlPractice ( l{P-l) of t lre National Conference of Standarrls Laboratories (NCSI-), USA &ISO 10012 Par t I / ISO 9000 ,

0 User Manua[ prov ided.

I lardrvare / Softrvale Rerluirenreuts

I A l lent i t rnr PC or conrpat ib lest Mininrunr 8 MB ILAMi At least 20 MB free space of hard dislrI Wjnc low s '95 I Wint lows NT

$