OPERATING AND SERVICE MANUAL - HP Archive

1 OPERATIONANDSERVICEMANUALMODEL6920 BMETERCALIBRATORMANUFACTURINGCODEA-OPERA TINGANDSERVICEMANUALHEWLETTPACKARDHARRIS ONDIVISIONHEWLETT~ ' ,or,inthecaseofcertainmajorcomponentslis tedintheoperatingmanual,forthespecifiedp eriod.\ ! ' ' ..ISt."Of~nwu"~.lCU" , o~~.2.!i<.lI~ o~ ~ <BUSINESSREPLYMAILF'II~elM'EIlM'T:.;10 , , ,19651:." ~-* 'lnqe:100~Range:OtherRanges:SPECIFICATIO NSI nput:105-125 VAC,singlephase, * :Involtageranges, , :Theaccuracyspecificationswillbemetwithl inevoltagesfrom :0 + :DC- 1 ,i:-" , '.DCorACatthepower-linefrequency;however , ,100, ,whilehavingthesamewaveformasthein-putpo werline, , , , ,throughtheluseofallsemiconductorcircuit ry, (NEMA).

2 , , , ,brokenknobs, , (l220F).Forratedaccuracy,thetemperatures houldbebetweenISoCand350C(590 Fto9 SoF). , , "Miscellaneous". "Fragile--DelicateInstrument", ,JJJJJJJJJJ;, :IftheinstrumentistobeshippedtoHarrisonL aboratoriesforserviceorrepair, , , "OFF" "OFF"whenchangingloads, ,theoutputswitchcanbetippedtoeitherthe"O NTEST"orthe"ONHOLD" "OFF"fromthe"ONTEST" "ONHOLD"positionuntilmanu-allyreturnedto "OFF".3-8 Alwaysreturntheoutputswitchto"OFF" "ON". (HI)terminalispositive(conventionalcurre ntflowoutoftheredterminal).3-12 InallvoltagerangestheBlack(LO) :Inallcurrentrangestheblackterminaliscon nectedtoapointinthecircuitwhichisasmucha sIvoltoffgroundpotential, , ~ "off".

3 RANGE1 VOLTSOUTPUT0 IMlICATOit 0lmVfIlllllCAlOlt "ClVI'PUTIWlTCWTOOfFfc:unn"OII11llM1,.e: a-rr.,.. '?UIIIC11ON"..MIlIlIA&. "ClUI1'UfIWII'Qr"TOTb' *I.~ "'OUTPUT swrfQl" :Cf.,..ACHARRISON69208M TERCALIBRATORHEWU:TT P' :DO~TTUllNWITHOUTI'UTSWITCHONOUTPUTSWITC HONOFFONTEST("ESET) :Selectsthevoltageorcurrentavailablewith theoutputdialatitsmaximumsetting-(1) :Provideslinepowertometercalibratorwheni n"AC"or"DC" (-) (seeparagraph3-29). :Open-circuitsoutputterminalswheninOff(r eset) "On"positionpowerisdeliveredtotheoutput. "OnTest"willreturn"Off"assoonasfingerpre s-sureisremoved."OnLock"Willremainonunti lmanuallyreturnedto"Off".

4 3-2 LLlLlLLLLl,..1 1:l2 L3 l4 , "AC",alternatingcurrentwillbedeliveredto theout-putterminals,whilein"DC", ,to(1) , ,considerthedecimalpointtobeimmediatelyt otheleftoftheleft-handdigit, "OFF" , ,movetheoutputswitchtothe"OFF(RESET)" "ON".3-23 GENERALOPERATINGPROCEDURE3-24 AbriefprocedureforusingtheModel692 GBmetercalibrator,printedonthefrontpanel , , , ,theOUTPUT switchshouldbereturnedto"OFF" ,theoutputvoltagewillmomentarilyexceedth efullvoltagecapabilityofthecurrentrangei nuse, "ON",anover-voltageprotectioncircuitwill turntheerroramplifieroff-preventingfurth erhigh-voltageopera ,theOUTPUTINDICATOR lightceasestoglowbrightlyandbe-comesvery dim, "ON".

5 Theover-voltageprotectionisresetwhentheO UT-PUTswitchisplacedinthe"OFF(RESET)" :Whentheover-voltageprotectionisenergize d,theoutputmaybeashighas20%oftherangeswi tchsettinginDCoperationor30% , " \~ , , +_"""-{+(]HI00A~~~ASSISGROUNDINGCONSIDER ATIONSHI+DISCONNECTLOTERMINALFROMCHASSIS GROUNDATA, )B)METERCALIBRATOR00eLQ]0[I]HI ~+ ,multimeters,batteryoperatedinstrumentsa ndclip-oncurrentmeterswhichhavenoconnect ionwithearthground, , (asshowninfigure3-2), ,withtheexceptionofclip-onmodels, ,illustratedinfigure3-3, (-) (+) (-)orLameterterminalungrounded,connectth e(+),high,terminaltoa + 1voltsource,withrespecttoground,ACforACm eters, , ,noproblemwillbeencounteredincalibration iftheLO(-) (-)}

6 ,La, , (+1)amplifiersuchastheDY-2460 ASolidStateDCamplifierwithDY-2461A-M4plu s-onegainplug-inisusedtoisolatethelow-si determinalofthemeterfromtheLO(-) , ,anyACmeterwhichisaverage-sensing, , ~' +1 AMPLIFIERMETERCALIBRATORMETERI0/08 CQJ 0 CDA--TABLE3-23-38 IfgreateraccuracyisneededfortrueRMSmeter s,anexternalsinewaveoscillatorcapableofs upplying60cps,15volts 10%at2ma, , , + + + + + + + + + , ,suddenchangesinlinevoltagewillnotbeimme diatelycorrected, ,anexternaloscillatorcapableofsupplying6 0cps,15volt 10%at2ma, :::oI-<[a:::m5 ~3-9ru; )Ien~0<[>~I~!\I,a::lLJ u~ )LOOlLJIa::l"')..Ju .Z(!) ~~ ~g::::> ,setbytheoutputdial, ,4-2 The6920 Bisamultiple-rangeAclDCpowersupplywhichi ssuitableforthecali-' ' , , ,anover-voltagetripcircuit, ,forexample1000 ;forexample, , ".]]

7 Modulator,intheerroramplifier, , ~ ,becausetheACreference,thesynchronousdem odulatorandtheinverterareallsynchronized withtheACpowerline, (IvSIGNALFOR]l!ULLOUTPUTJ+~~:Ja.~:Jo~r-- --"> ::0~U~:x::x:~t--U~uw~~C/)C/)r--i(!)I~C/) zC/) ::r--0wo~-w~(!)z0::LLUI--z-0~Zet~:x:!iI~ U:Jo::~WI---LLi[r-",U:J0::~z~-wt----:J~~ 0C/)~f--wetr--1' ,._,(!)z~etuIl::et--m0wwLL--//1~CURRENTI<ILIMIT1 III' ~INVERTERLINE-,IDRIVEI>IIII,IOFFII~ !:'L'---------:1==, "IfaSll:1-'\ '~..' .,flia' ,h"gilhiii"!Iiltatlt:i'.., ,.oiili.++ ++ ++ ++100).1010 KlAMPTOERRORAMPLIFIER5 MEGIVOLTTOERRORAMPLIFIERLLLlLlllLlLLLl5+ + , >+----O4-21 ACREFERENCEJJJJjJ:i JJJJJJjJJJjJPHOTO-RESISTORIVACREFERENCEV OLTAGER76 AlUNREGULATEDACDCREFERENCE+62 VCR31R68R67R66R65CR30----~---------~---- ---------~--~ + ,itselectstheproperdividerorseriesresist or,incurrentranges,toprovidethe1 ;theselevelscorrespondto1000 VatlOrna,100 Vat100ma,10 VatlAand2 Vat.

8 , \. , , . , "ON" , ,..LR47 TOREFERENCEINPUT '----{) ~,r[ ]oIOFF(o[IT].. ~..[]I] Thesectionincludesrecommendedtestequipme nt,performancechecks, , ,theproceduresareusefulasincomingoroutgo ingqualitycontrol,periodicmaintenance, "OFF". "AC"or"DC". (1) ,yellow"OUTPUTINDICATOR"shouldlightwhent he"OUTPUT"switchisturned"ON". "RANGE"inanyofthesixcurrentranges,theyel low1I0 UTPUTINDICATOR'shouldlightwhenthe1I0 UTPUT"switchisturned"ON".Onthe10 Amprange, (1) + , ,checktheremainingthreeDCVOLTAGE rangesandthefourACVOLTAGE ranges, ~~l~ +I ~~+0I0eO0eOIir=;>0<~~eOeOo+r-l'I)l)~\\[Qj~~~CD0(\Jenl!)00 Buo+I@@~~+0II0eO0eO0eOeO0+~II'0>~'=<;;:::-:3I[2jo@~i:+~ 0(\Jenl!]}

9 00B5-2zo~0:: )et<D G:~>C)z~uW::I:Uf,._~r"'''''r"""f'~'r'''''''' 6920A'--'~~.f""''''''f~~~.r-'''''''""'"" "741Af'~-'~"'-'~'"'",,"",,'08LQ]oIT]oHI~ LO+\ ~I@0+@-CD0CD DY2460 AII I~o0000o+~+~Eb~L-DC741 AoI~I@aa@ +~CD0o O+ij""ij+0o "0~O-~-6920A()l~_~I0 IOE) " +1 AmplifierTABLE5-1 RequiredCharacterfsticsAccuracyof2:1%90- 130 VoltsExpandedScale100-130 VoltRanges5 AmpCurrentCapacity2001- 1watt1 ~~~~~~~~~~~~~~~~~~~42,"'30346'"510 CLIPSECTION7612 CLIPSECTION71110 :IC9 9/8~-"---"'"'"'" Ampere10 AmperesTABLE5-2%SettingOutputErrorDC(1) + (1) :t12mv(1) + (1) (1) + + (1) (1) (1) + +120tta(l) * +12rna%ErrorAC.

10 :t5mv+ :t50mv+14mv.:t500mv140mv.:t5V. 50tta, +500tta. +5rna+ +30rna+14rnalInallcurrentranges,whenusin gthemonitoringresistorvaluesshowninFigur e5-2,theeqUivalentvoltagetolerancewillbe asshowninthe1 Voltrange.*Except+2mvDCt+ , "OFF", , .05% "ONII checkcalibrationat(1)000and100onthedial, , :Donotoperatethe6920inanycurrentrangewit htheOUTPUT"ON"withoutasuitableresistorac rosstheoutputterminals, (1) , +3mvof1. 000voltinDCand+ :5-14 InverterPhasing5-15 BalanceAmplifierACI-voltOFF(RESET)(1) (ground). (; ) (sinewavedisplayshouldreversephase)andad justR78sothatthesinewavedisplaystartsatt heDCbaseline(. ) (Forphysicalconvenienceconnecttotheendof R90thatislocatednearesttopotentiometerR7 .)