静态放电测试.docx
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静态放电测试.docx
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静态放电测试
1.0SCOPE:
1.1Thisdocumentisintendedtostandardizethemethodandmanner
ofapplyingsimulatedelectrostaticvoltagestoapplicableproducts.
1.2ProductstobeTested:
ProductType
Applicable
TestClasses(Note1)
CECompliant(European)
0
CE1
3
CE4
5A
6
7
8
MultiplexEquipment
0
1
3
PortableProducts
0
1
2
3
4
5A
5B
7
8
CECompliant(European)
0
CE1
2
3
CE4
5A
5B
7
8
PowerSupplies/
BatteryChargers
0
1
2
3
4
5A
5B
7
8
Note1:
RefertoTable1.0fordefinitionofeachtestclass.
1.3Application:
TheprototypeandpilotrununitssubmittedtoReliability
Engineeringforevaluationwillbesubjectedtoelectrostatic
dischargetestsasoutlinedinthisdocument.Theywillnot
alwaysbeperformedlast.Inaddition,productionunitsmay
besampledandsubjectedtothesetestsatthediscretionof
ReliabilityEngineering.
Aminimumofthree(3)unitsofeachtype(prototype,pilot
run,and/orproductionversion)shouldbetestedtoshow
consistentconformancetospecifications.Forexample,
3differentprototypeunitsshouldbetestedforESD
performance.
2.0PURPOSE:
2.1Toestablishavalidtestprogramandtoensureahigh
standardofproductreliabilityundertheconditionsofhigh
voltageelectrostaticgeneratedbyantennasystemsand
personnelfromnormalproducthandling.
3.0TESTEQUIPMENTSREQUIRED:
3.1SchaffnerNSG435:
a)HumanDischargeNetwork(separateforpositiveadnegative)
(150Pf/330OhmRCdischargenetworkperIECPub.801-2),
±1to±15KV.
4.0GENERALDESCRIPTIONSOFNSG435
4.1GeneralDescriptionofNSG435ESDSimulator
SeeFigure2.0forapictureoftheNSG435.Thelabels
F1-F5onthefrontpaneldiagramarereferencedin
subsequentparagraphsexplainingtheusedoftheNSG435.
4.1.1Battery
There-chargablebatteryisinsertedbyinsertingthe
lowerendofthebatteryintothehand-grip.Thenpull
downonbatteryandtiltinupperend.Takeoutthebattery
bypullingdownbatteryandtiltingoutupperend.When
thebatterychargeislowtheLOWBATindicatorblinks
andwhenthebatteryisemptytheLOWBATindicator
remainssteady.Atthistimethebatterymustberecharged
byremovingthebatteryandinsertingNiCdchargerinto
thepowerreceptacleofthebattery.
4.1.2SwitchingOn
TheNSG435isturnedonbypressingtheyellowpower
buttonatthetopoftheinstrument.Theinstrument
switchesoffautomaticallyafter30minutesofnon-use
althoughtheparametersthathavebeensetwillremain
storedinmemory.
4.1.3Air/ContactDischarge
F1togglesbetweenair-dischargeandcontact-discharge.
Achangetocontactdischargeispreventedifthevoltage
setforthisoperatingmodeoriftherepetitionfrequency
istoohighi.e.over10pulses/s.Theroundedtestfinger
mustbeattachedwhenusingair-dischargeandthe
pointedtestfingermustbeattachedwhenusingthe
contact-discharge.
4.1.4Voltage
PressF2tobranchintothemenuforthevoltagesetting.
Someoftheotherbuttonswilltakeondifferentfunctions.
PressingF1orF2raisesorlowersthevoltage,respectively.
PressF3toselectoneofthefourstoredvoltagevalues.
PressF5afterselectingthevoltagedesiredorelsethe
instrumentwillautomaticallyreturntothestartingmenu
levelafterabout10s.
4.1.5Polarity
F3togglesbetweenpositiveandnegativepolarity.The
signshowninthedisplayalterscorrespondingly.
4.1.6RepetitionFrequency
UseF4toscrollthroughallpossiblefrequenciesfor
repetitivedischargesandtosinglemodedischarge.The
singlemodeshouldbeusedwhenperformingtests.
4.1.7Counter
Thecountersumsthenumberofdischarges,irrespective
ofoperatingmodeandirrespectiveofwhetherotherpulse
parametershavebeensetinthemeanwhile.Thecounter
worksinadecrementingmannerinthepre-selectcounter
mode.F5setsthecountereitherbackto0ortothe
presetvalueifthepre-selectcountermodewaschosen.
Tochangethepre-selectedcounterpressF5toreturnto
theoriginalmenulevel.F2toraiseorlowerthepreset
value.
PressF5toreturntotheoriginalmenulevel.Pulse
triggeringisterminatedwhenthecounterreaches0000.
F5reloadsthepre-selectcounterwiththeoriginalvalue.
Thepre-selectcountershouldalreadybesetto10.
4.1.8Storingvoltagesettings
Pre-programmeddischargevoltageshavebeenstoredin
fourmemorylocationsforbothairdischargeandcontact
discharges.Tochangethestoredvaluesselectdischarge
modewithF1.CalluptheVoltagesub-menuwithF2.Set
therequiredvoltagewithF1orF2.PressF4;amemory
location(1…4)appearsoverF3.UseF3tospecifythe
requiredmemorylocation.PressF4againandthevalue
isstored.PressF5toreturntotheoriginalmenulevel.
Voltagelevelsof3,5,10,and15shouldalreadybesetfor
airdischargeandlevelsof4,6and8forcontactdischarge.
4.1.9Groundcable
Groundcablemustbeattachedwhenperformingstatic.
Thegroundcablecanbescrewedintooneoftwoplaces
ontheNSG435.Theselocationsarebesidethetestfinger
orundertheunit.Bothlocationsaremarkedbythe
groundsymbolontheunititself.
4.2GeneralDescriptionofSchaffnerNSG435
4.2.1HumanDischargeNetwork:
(±15KVDC)
Thehumandischargenetworkisaplug-inmoduletothe
mainunit.Thenetworkconsistsofa150pf/330ohmRC
network.Therearetwoavailable,oneforpositiveand
theotherfornegativevoltages.Insertintothesideof
themoduleswhenyoumustswitchbetweenpositiveand
negativevoltagesbecauseonlyone,moduleissupported
atatime.Theroundedtestfingerextendseachmodule.
4.2.2ContactDischargeAdaptor:
Thisadaptorallowsfordirectcontacttoconductivesurfacesand
causedcurrentinjectionofthepulse.Theminunitisfirstequipped
withtheappropriatedischargenetwork.Loosentheknurlednutto
allowconnectionoftheAdaptor’sgroundbrackettothechrome
postoftheplug-inmodule.Backoutthescrewonthesideofthe
adaptorandslidetheadaptoroverthemodule’stestfinger.Rotate
theadaptorsoitsgroundbracketopenendinsertsoverthepost
andbetweenthecablegroundingplateandtheknurlednut.Tighten
theknurlednutonthepost.Tightentheadaptor’sscrew.Locatethe
phonecableandinsertthesmallerphoneplugintotheadaptorand
thelargerphoneplugintothetopofthemainunit.Thiscable
providesthecontrolandrelaycurrenttotheadaptor.
4.2.3Voltmeter:
Thebuilt-inDVMmeter,locatedontheleftsideofthe
mainunit,measurestheoutputvoltagelevel(KV)present
onthetestfinger.
4.2.4OutputHV-Level:
Raisevoltagetotheproperlevelbyturningthecontrol
clockwise.Thebuilt-inDVMmetershowstheproperset
level.
Note:
Theuseriscautionedtokeepthevoltagesettozero
whennotIusebyturningthecontrolcounter-
clockwise.UnplugthepowersupplyfromtheAC
lineanddischargethetestfingertogroundto
ensurezerochargeontheunit.Performthis
procedurewheneveryouinterchangetheplug-in
modules.
4.2.5PowerSupplyFuse:
Thefusereceptacleislocatedwithinthepowersupply
nexttotheAClinecordreceptacle.Ithousesaglass
1/4amp.250V,2AGSlo-Blosubminiaturefuse
(NewarkP/46F3384).Thereisnoswitchonthepower
supplysopluggingitintotheACwalloutletmakesthe
unitlive.
4.2.6GroundStrap:
Thegroundstrapisasixfootsribboncableconnected
fromthechromeplatedpostoftheinsertedmodulein
themainunittoasuitableearthground.
4.2.7Triggerbutton(On/Offbutton)
Pressingthisbuttonothepistolgriparmsthesimulator
withtheoutputvoltagepresentonthetestfinger.
5.0TESTSET-UP:
Thetestset-upconsistsofthetestgenerator,equipmentundertest(EUT)
andauxiliaryinstrumentationnecessarytoperformdirectandindirect
applicationofdischargestotheEUTasapplicable,inthefollowingmanner:
a)Contactdischargetoconductivepointsontheproductandtocoupling
planesofthetestset-up.
b)Airdischargetoconductivepointsandinsulatingsurfaces
Agroundreferenceplane(GRP)shallbeprovidedonthefloorofthe
laboratory.Itshallbeametallicsheet(Copperoraluminum)of0.25mm
minimumthickness.Theminimumsizeofthereferenceplaneis1M
square,theexactsizedependingonthedimensionsoftheEUT.Itshall
projectbeyondtheEUTorcouplingplanebyatleast05monallsides,
andshallbeconnectedtotheprotectivegroundingsystem.Localsafety
regulationsshallalwaysbemet.
TheEUTshallbearrangedadconnectedaccordingtoitsfunctional
requirements.Adistanceof1Mminimumshallbeprovidedbetweenthe
EUTandthewallsofthelaboratoryandanyothermetallicstructure.
TheEUTshallbeconnectedtothegroundingsysteminaccordance
withitsnormalapplication.IftheEUTdoesnothaveagroundreturn
thenaprobewitha150Kohmresistorinseriestoagroundreturnwillbe
usedtobleedoffstoredchargesformaccessiblecontacts(battery,
programmer,charger,etc.)betweendischarges.
ThedischargereturncableoftheESDgeneratorshallbeconnectedto
thegroundreferenceplane(GRP).
Wherecouplingplanesarespecified,forexampletoallowindirect
applicationofthedischarges,theyshallbeconstructedofthesame
materialandthicknessasthatofthegroundreferenceplane,andshall
beconnectedtotheGRPviacablewitha470Kohmresistorlocatedat
eachend.Theseresistorssh
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