Amptec Research 601ES Manual

2Wire
4Wire
MILLAMPERES
+HIGH
RESEARCH
AMPTEC
601ES EXPLOSIVESAFETY
DIGITALMULTIMETER
STRAYCURRENT
PRESSTOMEASURE
milliammeter
0-10mADC
PRESSTOMEASURE
CASE
GROUND
LOW
V
I9999
>>>OR
LOBAT
V
A
. . . .
POWER
ON
OFF
STRAYCURRENT
FUSE(5AMPERE)
VLO
VHI
50mV-5mA
SIGNAL
SOURCE
DISPLAY
BACKLIGHT
RESEARCH
AMPTEC
CALIBRATED
MODEL#.
SERNO.
DATE
DUE
TamperProofSeal/Sticker
Calibrationvoidifremoved
601ES
601ES-503
05APR2005
05APR2006
I
press/hold
2.0KOHM
20OHM
200OHM
2.0OHM
20KOHM
FUNCTION/RANGE
2AMP
AC/DC
600VRMS
200V
AC/DC
20V
AC/DC
2.0V
AC/DC
BatteryCompartment
4each"AA"Alkaline
RESEARCH
AMPTEC
OPERATION/MAINTENANCEMANUAL
RevisionD
PHONE[phone]; FAX[phone]; TOLL FREE IN USA 800-350-5105
websitehttp://www.amptec.com
AMPTEC601ESDMM
SafetyDigitalMultimeter

TABLEOFCONTENTS
SECTIONA:ReceivingandInitialInspection
SECTIONB:601ESExplosiveSafetyDMMSpecifications
SECTIONC:Replacement,OptionalandAccessoryItems
SECTIOND:Operation,FunctionandUse
SECTIONE:GeneralOperationandDesign
A-1IntroductiontotheAMPTEC601ESExplosiveSafetyDMM
A-2Receiving,UnpackingandInitialInspection
A-3Openingthe601ESExplosiveSafetyDMM
A-4BatteryReplacement-PowerRequirements
A-5SetupandUse
B-1TableB-1&Specifications
C-1AvailableAccessoriesandOptions
D-1General
D-2FrontPanelFeaturesandOperation
D-3Complete601ESExplosiveSafetyDMMFrontPanelDiagram
D-44-WireResistanceMeasurement(601ESDMMversionsonly)
FigureD-4.IgniterTesterKelvinBlockDiagram
D-5Connections
D-6FatiguedAdaptersandLooseConnections-
CommonSourcesofMeasurementError
D-7BatteryMonitoringCircuitry
D-8FailsafeOperationOverview
E-1General
E-2Troubleshooting
E-3LocalizingtheProblem
E-4ComponentReplacement
E-5CircuitDescriptions
E-5.1DVMIC401-MAX7129
E-5.2Resistance
E-5.3PowerSupply
E-5.4RelayControl
E-5.5Microprocessor
E-5.6DigitalVoltMeter
2

SECTIONF:RoutineMaintenance
F-1General
F-2RequiredTestEquipment
F-3CalibrationProcedure
F-3.1ZeroOffsetAdjustment
F-3.2FullScaleAdjustment
F-3.32.0OhmRangeAdjustments
F-3.4VerificationofEachRangesAccuracy
F-3.5AC/DCVoltageAdjustments
F-3.6AC/DCCurrentAdjustments
F-3.750mV/5mASignalSourceAdjustments
F-4BatteryReplacementInstructions
3

A-1.IntroductiontotheAMPTEC601ES
ExplosiveSafetyDMM/IgniterTester
PowerOn
TheAMPTEC620A,630,640seriesandnow
theAMPTEC601SeriesExplosiveSafety
DMMsaredesignedtobethe"
",
andprovideextremelysafeandreliablevoltage,
currentandresistancemeasurement/testingof
explosiveorvolatiledevices.SafetyApprovals
fromvariousSafetyBoardsinclude,theU.S.Air
Force(620A-4)forgenericuseonmissile
warheadsandtheUSNAVALORDNANCE
CENTER(630AN630BN,640Nandother
versionspending).Someofthedevicesthe
601ESDMMExplosiveSafetyMetermaybe
usedoninclude:fuses,squibs,igniters,EBW,
explosivebolts,rocketmotorsquibs,tonamea
few.
TheAMPTEC601ESExplosiveSafetyDMM
supportssafeordnancetesting.Manycustomers
needtosafelymeasurestrayvoltagecircuitry(
RMSACandDC),straycurrentandresistance
usingthefailsafeoutputcircuitryproprietaryto
AMPTECRESEARCHinsurethattestcurrent
levelscomingfromthe601ESdon’texceedthe
specified"failsafecurrent"eveninaworst-case
componentfailuresituation.Thefailsafefeature
istestedineveryinstrumentbeforeshipment.A
built-inpassive(analog)DCMilliammeteralso
letstheuserverifyactual601ESDMMcurrent
outputlevelspriortoconnectiontoanyEBW,
squibordetonator.
-TheAMPTEC601ESDMM
ExplosiveSafetyMetermain"Power"switch
toturnthe
meter"ON"or"OFF".Thisfeaturehelps
preventtheunwantedeffectofbumpingofthe
powerswitchandaccidentallyturningthemeter
"OFF"or"ON".
LoworDeadbatteries(AAtypeAlkaline-4
each)istheprimaryreasonfortheAMPTEC
601ESDMMnotpoweringup.Ifthebatteries
reachalowenergyleveltheunit'sLCDDisplay
"LOBAT"indicatorappearsonthedisplay.
Standardinthe
ExplosiveSafetyIgniterCircuitTestindustry
,
mustbehelddownfor2seconds
TheAMPTEC601ESDMMSafety
Meterhasa
circuitthatindicateswhenitistime
Toreplacethebatteries.Theycanbereplaced
withouteffectingthecalibrationofthemeter.
Thebatteriesarehousedintheirown
compartmentcompletelyseparatefromany
activeelectroniccircuitry.
ShouldtheAMPTECshippingboxappear
damageduponarrival,requestthatthecarrier's
agent(i.e.UPS)bepresentwhentheunitis
unpacked.Ifthe601ESDMMExplosiveSafety
Meterappearsdamaged,thecarrier'sagent
shouldauthorizerepairsbeforetheunitis
returnedtothefactory.Eveniftheinstrument
appearsundamaged,itmayhavesuffered
internaldamageintransitthatmaynotbe
evidentuntiltheunitisoperatedortestedto
verifyconformancewithitsspecifications.You
mayrefertothe
(i.eTestleadsetc.)
Iftheunitfailstooperateorfailsto
meettheperformancespecifications
ofsectionB,notifythecarrier's
agentandAMPTECRESEARCH.
Retaintheshippingcartonforthe
carrier'sinspection.
oranyofitssalesoffices
an(RMA)ReturnMaterial
Authorizationnumber.Weneedtoknowwhoto
contactandhowtocontact(i.e.phonenumber
andFAXnumber)inordertoproperly
coordinatethereturnoftherepairedAMPTEC
product.
Wemay
possiblybeabletofixtheproblemoverthe
phoneandpreventyoufromhavingtoreturnthe
unittoAMPTECforrepair.
batterymonitoring
A-2.Receiving,Unpacking,andInitial
Inspection
DONOTreturnequipmenttoAMPTEC
RESEARCH
BycallingAMPTECRESEARCH
first,priortojustreturningthe601ESDMM
ExplosiveSafetyMeter,wecanoftentrouble-
shoot(basedonthesymptomsyoudescribe)
andidentifytheproblemoverthephone(i.e
batterylooseinthebatteryholder).
Trouble-Shootingsectionof
ChapterDofthismanualtohelpidentifythe
problem
without
firstobtaining
SECTIONA-RECEIVINGANDINITIALINSPECTION
RMA
4

A-3.Openingthe601ESExplosiveSafety
DigitalMultimeter/IgniterTesterand
RemovaloftheLid
A-4.DCBatteryPowerRequirements
AA
rechargeable
Whenclosed,the601ESDMMhastwolarge
O-ringsthatprovideawaterresistantseal
.Thismakesiteasiertoflipupthe
releaselatch.Repeatthepalmpresssteponthe
othercornerofthesafetymeter.Atthispointthe
601ESDMMlidwillnormallybeabletobe
raised,andplacedinanopenlidstate.
The601ESExplosiveSafetyDMMshouldopen
afterflippingupthereleaselatches,evenaftera
changeinatmosphericpressuresincetheunitis
fittedwithanautomaticpurgevalve.Youmight
needtopressdownofthecornersoftheclosed
casewithyourpalmthenflipopenthelatch.
TheAMPTEC601ESExplosiveSafetyDMMcan
bepoweredinternallybyavarietyofheavy-duty
AAbatteries.Werecommendeitheranalkaline
batterypack(4ea.cell-1500mAHrea.,
preferablyDuracellMN1500orbetteri.e.Duracell
Ultra).Asetof4ea“AA”heavy
dutyNickelMetalHydridebatteriessuchasthe
.By
pressingdownwithyourpalmasshownin
Fig.A-3,youcompresstheO-ringinthelidof
the601ES
1.2Valsoworkquite
well.OurtestsshowtheEnergizer2500mAHr
lastedaslongastheDuracellUltra’sAlkaline.
SinceNickelMetalHydridesarere-chargeable,
theyofferabatterylifecycleahundredtimes
greaterthananyalkaline.Besuretochargethe
NickelMetalHydridebatterieswhentakenout
oftheiroriginalpackagingforthefullcharge
cyclepriortoinstallingthemintheAMPTEC
601ESSafetyDMM.
Thebatterycompartmentiscompletelyisolated
fromtheunit'sinternalelectronics.Theuser
mayreplacethe4ea"AA"batteriesasneeded
withouteffectinganyinternal601ESDMM
circuitryortheunit'scalibration.TheAMPTEC
601ESDMMbatterylifeisdiminishedthe
longerthebacklight(heavypowerdrain)isused
andthelongertheunitisleftunattended.
“LowBatterylevel”isindicatedbya“LOBAT”
display.Replacingthe(4)each‘AA’batteriesin
theseparateweatherized‘AA’batterycompart-
ment(sealedmetalbatterybox)canbeper-
formedinthefield
Thereisno“NoAccess”toany
AMPTEC601ESExplosiveSafetyDMM
internalelectronicsfromtheunit’sseparate
internalmetalboxbatterycompartment.
Energizer2500mAHr
“on”
withouthavingtore-
calibrate.
601ESDMM
PressDownwithPalmhere
WhileopeningreleaseLatchA
PressDownwithPalmhere
WhileopeningreleaseLatchB
A.ReleaseLatch B.ReleaseLatch
C.AutomaticAirPressureEqualization(PurgeValve)
Sect.A-ReceivingandInitialInspection
FIG.A-3
MADEINUSA
WWW.AMPTEC.COM
TEL[phone]
RESEARCH
AMPTEC
EXPLOSIVESAFETY
DIGITALMULTI-METER
MODELNUMBER 6ES01
SERIALNUMBER 601ES-501
5

Avoidexposingthe601ESExplosiveSafety
DMMtoextremesoftemperaturewhichwill
affectaccuracyandshortenbatterypack
lifespan.
Oncethe601ESDMMmainpowerswitchis
turned"ON"andfollowinga(1)minute
warmup,(
)theAMPTEC601ES
ExplosiveSafetyDMMshouldbereadyfor
generalpurposetestinganduse.
The601ESDMMoperatormaybeaskedto
performaseriesoftests(i.e.verifythetest
currentislessthan10mAwiththeunit'sDC
milliammeter)priortoconnectiontoany
explosivedeviceundertest.
Testleadsetsmayalsobeplacedinthepouch
whichholdsthelaminatedAMPTEC601ES
DMMOperatorInstructionCard.
providedthereisNo‘LOBAT’
Indicatorshown
Toreplacelowbatteriesfirstunscrewthe
batterycompartmentlidandlift.Removethe
batteryholder,plastictieandlowbatteries.
Replacewithanewsetof(4)“AA”batteries
accordingtopolarity.Usingthespareplastictie
includedinthebatterycompartment,wrapthe
plasticaroundthebatteryholderandsecure.
Cutexcessplastic.Next,wraptheblackand
redwirearoundthebatteryholderandplacethe
holderintothecompartment.Lastlyreplacelid
andscrewinscrewstosecure.SeeFig.A-4
above.*Pleasenote:Afterreplacingbattery
holderwith(4)new‘AA’batteries;securewith
anewplastictielock.
The601ESExplosiveSafetyDMMconsumes
littlepowerandgeneratesvirtuallynoheat.
Consequently,itmaybeusedinanyareawhere
theenvironmentdoesnotexceedthe
specificationsofTableB-1.
A-5.SetupandUse
BATTERYHOLDER
‘AA’BATTERY
FIG.A-4
Sect.A-ReceivingandInitialInspection
TheAMPTEC601ESDMMcomesfactorysetwith
an“AutoTurn-Off”timeoutof30minutes.
Withcertainbatteriesattheendoftheirpower
capacitythe“LOBAT”displaymaybeonlyonfora
minuteorlessbeforethe601ESAutomaticallyshuts
down.Asanexample,ifyouturnitonanddon'tsee
“LOBAT”.Theninafewminuteswalkoutonand
returntodiscoverthemeteristurnedoff,
aretheprimaryreasonforthis.Anytime
the“LOBAT”displaystaysonformorethana
secondortwoitistimetoexchangethebatteries.
low
batteries
6

SECTIONB-601ESEXPLOSIVESAFETYDMM
IGNITERTESTER-SPECIFICATIONS*
Warm-upTime5Minutes
20.0V
2.0V
(for1year@25°C±10°C)
Operating0°Cto50°C
Storage-20°Cto70°C
0.0%per°C(from0°C-15Cand35°C-50°C)
..(20,000count)4½digitLiquidCrystalDisplay()withhighcontrastbacklight
....LCDDisplays""(frontpanelenunciated)
...(opencircuitorselectnexthigherrange)Displays""
.....Approximately300ms
(Indicationrange0to10mAFullscale)-Accuracy±3.0%
........doublediodeclampedat<1.6volts
..Batteries(4each"AA")canbe
highcapacityre-chargeable1.2V-NiMH(i.e.Energizer2500mAHr)
............................9.5"(24cm)Wx11"(27cm)Dx3"(8cm)H
................................10lbsnet;15lbsshipping
TrueRMSAC-DCVoltageMeasurement-DCand60Hz
TrueRMSAC-DCCurrentMeasurement-DCand60Hz
SignalSource:
50mV
5mA
200VDCorACRMSrange........Accuracy±0.50%ofrange
DCorACRMSrange........Accuracy±0.50%ofrange
DCorACRMSrange........Accuracy±0.50%ofrange
2.0AmperesDCorACRMSrange........Accuracy±0.50%ofrange
2.0OhmRangethru20KOhmranges..............±0.05%ofreading±0.05%ofrange
2Wire”±0
(50mVand5mA-20,000countdisplay)
Voltagemodedisplayaccuracy:50mV50countsonthe2.0Voltrange
Currentmodedisplayaccuracy:5mA10countsonthe2.0ampererange
±05°
...heavydutyAlkaline(1.5VDuracellCoppertopUltraor
equivalent)ororequivalent
TableB-1Specifications
ResistanceMeasurementAccuracy:
TemperatureRange
TemperatureCoefficientforallfunctions
InstrumentDisplayLCD
LowBatteryIndicationLOBAT
Over-RangeIndication>>>OR
MeasurementUpdateRate
AnalogDCMilliammeter
OpenCircuitCurrentSourceComplianceVoltage
Power
Dimensions
Weight
4WireMode
“resistancemode:(ifshortedleadscanbe“zero’ed”)-additional0.5%ofrange
+
+
*revised14JAN2006
600VDCorACRMSrange........Accuracy±1.0%ofrange
7

C-1.AvailableAccessoriesandOptions
Thismanualdoesnotlistallpossible
accessoriesthatAMPTECRESEARCHis
willingtoprovideasasupportitemsforthe
AMPTEC601ESDMM.Contactthesales
departmentatAMPTECRESEARCHifyou
havearequestforanitemthatisnotdescribed
here.Listedbelowaresomeoftheoptions
availableforusewiththeAMPTEC601ES
ExplosiveSafetyDMM.
Option401:GoldPlatedSingleProbeLeads
Option"401"isahandheldprobe
(oneblackprobe&oneredprobe)leadsetter-
minatedin.TheOP401handheld
probesallowforeasyaccesstoconnectorsocket
wiring(i.e.droneparachutesquibsockets),
recessedsurfacesandparts(i.e.flares)thatalli-
gatorclipleadssimplycan’taccessproperly.
Option"401"plateda4-wireleadset(uptothe
probetip,2and2style)isterminatedwithsin-
glehandheldprobetestpoints.The
“401”alsohasdualbananaleads
thatconnectdirectlytotheAMPTEC601ES
DMMmeasurementfrontpaneljacks(redand
white).4-wireKelvinismaintaineduptothe
pointoftheprobetipconnection,eliminating
98%ofthecableresistance.Goldplatedtips
andbananajackendsprovideanoptimallow
thermalemfconnection.
goldplated
singlepoints
goldplated
goldplated
KelvinLeads,ProbesAccessoriesand
Options
AllAMPTECseriestestleadandprobesetsare
aminimum48"length,dualbanana
terminationattheohmmeterend(callthe
SalesDepartmentatAMPTECRESEARCH
foranycustomrequirement).
Option4034TerminalKelvinMini-probes:
with0.18"separation,oneredandone
blackhandheldprobe.Excellentgeneralpurpose
4-WireKelvinMini-Probe,andalongwiththe
Option"300"KelvinClipLeadseasilyfitinside
theAMPTECtestleadpouch.
Eachprobehastwospringloaded,goldplated,
steeltips
Option300:4-WireKelvinLeadSet
RecommendedforCalibration-Option"300"isa
fourwireKelvinleadsetforall
AMPTEC601ESDMM.Option300isashielded
48"leadsetterminatingin½"openinggoldplated
copperKelvinclips.Theoption"300"canclip
easilytowires,pinsandmediumsizeconductors
(upto½"diameter).Thedualbanana
goldplated
Option“300”
Close-Up
Option"300"
4-WireKelvinClipTestLeadSet
(GoldPlated)
SECTIONC-REPLACEMENT,OPTIONAL
ANDACCESSORYITEMS
8

plugterminationsconnectdirectlytothe601ES
DMM’sfrontpanelinputterminals.
Option"305"isa48"shieldedcableterminated
indualbananaplugsatbothends.
Option"320"arethegoldplatedKelvinClips
usedontheOption"300"cableset.Theseclips
maybeusedwhenmakingcustomcablesor
whenrepairingOption"300".
Option"360"areGold-platedjumpercable
(largejaws)typeclipsusedontheOption"350"
cable.TheyarestillKelvinClipsbecausethe
Option"290"istherecommendedgeneral
purposeAlligatorClipleadset(redandblack).
Option“290"isrecommendedasastandard2
wiretestleadsetforusewiththeAMPTEC
601ESSafetyDMM.Option“290"isa48"
longcablesetwithdualbananaplugsatone
end.Theotherendisterminatedwithan
alligatorclip(redandblack).Thesealligator
clipswillmeasure(2wiremethod)properly
witheitherupperorlowerjawconnectedtothe
conductivesocketcenterofplastictestpanel
jacks.KelvinClipssuchasOption“300”(using
the4wiremethod)mayhaveconnection
difficultybecausebothjaws (bothupperand
lower)mustmakeelectricalcontactwiththe
EED.
Option“290"AlligatorClipLeadSet
Option305:Banana-to-BananaCable
Option320:KelvinClips
Option360:Heavy-DutyClips
(Seephotoon
previouspage)
insulatedupperandlowerjawintegrityismain-
tained.Thesemaybeusedwhenmakingcustom
cablesorwhenrepairingOption"350".
Formoreinformationonaccessories,please
refertotheaccessoriessectionofAMPTEC
RESEARCH’swebsitefoundat
“http://www.amptec.com”.
Sect.C-Replacement,OptionalandAccessoriesItems
9

D-1.GeneralOperation
D-2.FrontPanelFeaturesandOperation
Adiagramanddescriptionofthefrontpanel
controls,connectioninstructions,andthetheory
behindresistancemeasurementisdiscussedin
thissection. Thissectionofthemanualcontains
completeoperatinginstructionsforthe
AMPTEC601ESExplosiveSafetyDMM.
1.Calibration/Maintenanceaccessscrews,
alsocanbeeasilyprotectedwithatamperproof
calibrationstickerorseal.Afterremovalofthe
screwsusehandles(item#3)andcarefullylift
up.Usecautionwiththeumbilicalcabling.
SECTIOND-OPERATION,FUNCTIONAL
SELF-TESTANDUSE
2.PurgeValve
3.Handlesonly
ONOFF
automaticallyprovidesair
pressureequalizationtoopenthe601ESDMM
instrumentcaseafteratransitinvolvingan
altitudechangeifunitwillnoteasilyopen.
Attached,item#3,arefor
liftingthefrontplateoncetheaccessscrews
havebeenremovedforcalibration.These
handlesareforcarryingthe601ES
DMMaroundwhenthelidisremoved.They
arestrictlyforcalibrationaccess.
he
main“Power"switch
toturnthemeter
“"or"".Thisfeaturehelpsprevent
notintended
mustbeheld
downfor2seconds
4PowerOn/Offswitch.-Tunit's
FrontPanelDiagram
D-3.601ESEXPLOSIVESAFETYDMM
2Wire
4Wire
MILLAMPERES
+HIGH
RESEARCH
AMPTEC
601ES EXPLOSIVESAFETY
DIGITALMULTIMETER
STRAYCURRENT
PRESSTOMEASURE
milliammeter
0-10mADC
PRESSTOMEASURE
CASE
GROUND
2.0KOHM
20OHM
200OHM
2.0OHM
20KOHM LOW
V
I9999
>>>OR
LOBAT
V
A
....
11
1
8
9
1
14
11
17
12
POWER
ON
OFF
STRAYCURRENT
FUSE(5AMPERE)
1
4
5
3
2
15
16
16
13
13
6A
6A
7
1
1
3
1
10
VLO
VHI
50mV-5mA
SIGNAL
SOURCE
DISPLAY
BACKLIGHT
1
RESEARCH
AMPTEC
CALIBRATED
MODEL#.
SERNO.
DATE
DUE
TamperProofSeal/Sticker
Calibrationvoidifremoved
601ES
601ES-503
05APR2005
05APR2006
I
FUNCTION/RANGE
2AMP
AC/DC
600VRMS
200V
AC/DC
20V
AC/DC
2.0V
AC/DC
press/hold
BatteryCompartment
4each"AA"Alkaline
18
19
66
6
6
6
1
10

6ATheLCDDisplay""
7DisplayBacklight
.willindicate
whenitistimetoreplacethebatteries.Itwill
typicallycomeonwhentheAMPTEC601ES
DMMinternalbatteries(4ea.15VDCalkalines
DuracellMn1500orbetter)reachapprox.
3.6VDC.Tochangethebatteriesremovethe
screwssecuringthebatterycompartment.The
backsideofthebatterycompartmentcoveris
linedwithaspongefillneoprenegaskettohelp
provideawaterresistantbatterycompartment.
Carefullypullthebatteryholderoutandremove
thecable-tiesecuringthebatteries.Observe
batterypolaritywhenreplacingthe"AA"batter-
ies.Re-securethefournew batteriesinthe
holderwithanewcabletie,thenreturnittothe
batterycompartmentandre-securethecompart-
mentlid(screws).SeesectionA-4fordiagram.
.isactivatedwhenthepush
buttonishelddown.Displayisback-litwitha
yellowgreenhue.Thisprocessaidsinthevisi-
bilityofthedigitswhenexteriorlightingisdim.
Pleasenotetheuseofthisfeatureshouldbeused
sparinglyinordertoconservebatteryreserves.
LOBAT
.
-
inadvertentpowerloss(i.e.bumpingofthe
powerswitchandaccidentallyturningthemeter
"OFF".TheAMPTEC
601ESExplosiveSafetyDMMisfactoryset,
usinginternalPCBjumpers,toautomatically
turn-offafter(30)minutesofinactivity(no
rangeorfunctionchange)toconservebattery
power.
5.
):AutomaticTurn-Off
ProtectionFuse
StrayCurrentRange
()
6.TheLCDDisplay20,000count
,4½digit
AV
Mk
>>>OR
(5.0ampfastblowtype)
the2.0ampere
measurement.ThetypeoffuseusedisaLittle
fuse3AGorequivalent.
is(1and
four9’s)design.LCDdisplay
annunciatorsincludes(Amperes),(Volt
annunciator),(MegakiloOhms)andthe
(OverRange).UnusedLCDdisplay
annunciatorsinclude"SELF-TEST"and"OK"
whichwillbeavailableforfuturecapabilities
withAMPTECRESEARCHsafetymeters.
protects
MILLAMPERES
+HIGH
RESEARCH
AMPTEC
601ES EXPLOSIVESAFETY DIGITALMULTIMETER
STRAYCURRENT
PRESSTOMEASURE
milliammeter
0-10mADC
PRESSTOMEASURE
CASE
GROUND
2.0KOHM
20OHM
200OHM
2.0OHM
20KOHM LOW
V
I9999
>>>OR
LOBAT
V
A
. . . .
11
1
8
9
1
14
11
12
POWER
ON
OFF
STRAYCURRENT
FUSE(5AMPERE)
1
4
13
13
3
2
15
16
16
5
6A
6A
7
1
1
3
2Wire
4Wire
8
1
10
VLO
VHI
50mV-5mA
SIGNAL
SOURCE
DISPLAY
BACKLIGHT
1
RESEARCH
AMPTEC
CALIBRATED
MODEL#.
SERNO.
DATE
DUE
TamperProofSeal/Sticker
Calibrationvoidifremoved
601ES
601ES-503
05APR2005
05APR2006
I
FUNCTION/RANGE
2AMP
AC/DC
600VRMS
200V
AC/DC
20V
AC/DC
2.0V
AC/DC
press/hold
BatteryCompartment
4each"AA"Alkaline
18
17
19
1
66
6
6
6
601ESEXPLOSIVESAFETYDMM
FIG.D-3
Sect.D-Operation,FunctionalSelf-TestandUse
11

8TwoWireFourWire
.twowiretestlead
connectionsalwaysusethefarleftinput
jacksVV
modeswitchinthe2Wire
positionshouldbeusedfor
allvoltage,currentandsimpleohms
includeallin-serieswiringresistance
4WireKelvin
.inputorKelvinmea-
surementtestleadconnectioninputsandmode
selectionswitchFor
both‘red’and‘white’,which
areshownasadottedlinebelowinitem#8.
Themustalsobe
.Twowiremode
mea-
surements.2wireelectricalresistancemeasure-
ments
fromthemeterouttothe"resistanceundertest"
andbacktothemeter(connection/contactresis-
tance,testleadlength,harnesswiringlengthand
moreetc.).The"FourWire"switchpositionis
onlyfor4WireKelvinresistancemeasurements
only.Basicallythe4WireKelvinconnections
minimizetheimpactoftestleadlengthresis-
tance andtestleadcontactresistanceoffsets.A
discussiononmaybefound
furtherinthismanual.
The
HighLow
9.Zero
(forthelower3re-
sistanceranges)
A.)
B.)
.0000withoutaminussign.
-TheAMPTEC601ESExplosive
SafetyDMMhasaprecisiontenturnzeropot.
zeroknobisturnedto"null-out"most
2wiretestleadresistance
.Thezeroadjustprocedurein-
volves:
Shortthetestleadsatthe“UUT”endto-
getherwhileconnectedtotheAMPTEC601ES
DMMthenadjustingthezeroknobuntilthe
displayshowsIf
yougetaminussignwhileadjustingthezero,
youhaveoveradjustedthezeroknob.Ifthisis
thecase,turntheknobbacktheoppositedirec-
tionuntiltheminussignisnolongerdisplayed.
Oncethezeroisadjustedyoucanconnectyour
testleadstothe"deviceundertest".Re-zeroing
(2wiremode)willbenecessaryonlyifyou
changetestleads.Donotforcethezeroknob
whenturningit,especiallyoncethestopshave
beenreached.Forcingthezeroknobpastthe
stopswillseverelydamagetheprecisionofthe
instrumentandviolatetheinstrumentswarranty.
(2,20,and200ohmranges)
10.Case/ChassisGroundJack
(nottiedtoearthground)
A.)
B.)
providesthe
useraccesstotheAMPTEC601ESDMM’s
FaradayCageandChassisground.Insomeap-
plications(i.e.anti-static)theAMPTEC601ES
DMMusermaywanttoconnectyour"In-House
localEarthGround"totheAMPTEC601ES
DMMchassisground.Allappropriateinternal
groundsoftheAMPTEC601ESDMMarecon-
nectedtothefrontpanelchassisgroundjack.
Theunit'scasegroundjackacceptsbananajacks,
spadelugsandevenbarewiresformakingan
earthtocasegroundconnection.Inotherappli-
cations,theAMPTEC601ESDMMusermay
wantthemetertobefloatingfromtheresistance
undertestandthe
casegroundjackmaybeleftdisconnectedor
ignored.
TheAMPTEC601ESDMMhasfourdiffer-
entrangesformeasuringAC/DCvoltage.The
meterstartsatthe600VRMStestlevel.Should
theuserdeterminethereisvirtuallynomeasur-
ablevoltageonthehigh(600V)rangethen
selectthenextlowerrange(200V).
Rotatingtheknobtothenext(clockwise)
rangeselectsthe200VTrueRMSAC-DC
Voltagemeasurementfunction(200Volts
fullscalemax.).ThisDCcoupledvoltagemea-
surementfunctionwillthereforedisplayanyDC
Voltage-upto200Vmax.Thisvoltagemea-
surementfunctionalsomeasuresTrueRMSAC
Voltageincludingdistortedwaveforms(band-
widthto100Hz).Theprocessofsteppingtothe
nextprogressivelylowervoltagerangewould
normallycontinueuntilthelowestrangeof2.0
VDC-ACRMS.The2.0Vrangedisplay
11.AC-DCVoltageVRMSMeasurement
STRAYCURRENT
PRESSTOMEASURE
2.0KOHM
20OHM
200OHM
2.0OHM
20KOHM
FUNCTION/RANGE
2AMP
AC/DC
600VRMS
200V
AC/DC
20V
AC/DC
2.0V
AC/DC
+HIGH
CASE
GROUND
LOW
V
VLO
VHI
I
2Wire
4Wire
4wireKelvinohms
usesall4terminals
+HIGH
LOW
V
VLO
VHI
I
Sect.D-Operation,FunctionalSelf-TestandUse
12

levels0.0000Vto1.9999V.The2.0Vrange
alsoallows50mVsignalsource(item#15)
checkstoseethattheAMPTEC601ESDMM
measuresanddisplaysapprox.0.0500voltsrms.
The50mVsignalsourceisbarelymeasurable
onthe20Vandhigherranges.
TomeasureACorDCcurrent(StrayCurrent
Test)connectinputandoutputwiresfromthe
UUTtothefarleftleadwiresacrosstothe
V/Vconnectioninputs.Connecttothe
“UUT”.
pushbutton.TheAMPTEC601ESSafety
DMMwillmeasurecurrentfrom0.1mAto
1.9999AC/DCcurrent.A5ampfuseprotects
themeterfromcurrentgreaterthan5amperes;
seeitem#5for fusedetail.
ThispassiveanalogDC
milliammetercanbeusedtoindependently
verifyAMPTEC601ESDMMoutputcurrent
levels.Thescale
is0-10mAfullscale.Aresistancerangeonthe
AMPTEC601ESDMMmustfirstbeselected
(Ohmsmode).Pressingthemilliammeter
switchroutestheAMPTEC601ESDMMohms
sourcecurrentoutputtotheanalog
milliammeter.Onthe2.0or20ohmrangesthe
AMPTEC601ESDMMusershouldobservea
milliammeterneedlereadingofapprox.5mA
comingfromtheunit’sohmssource.
HILO
DepressandHoldthe
(oftenused
beforemeasuringtheresistanceofanexplo-
siveelement).
fromtheunit’sohmssource
StrayCurrent
13.AnalogDCmilliammeter-
12.StrayCurrent-PressToMeasure.
14.ResistanceRanges
15.SignalSource-
16.FlipLatch
-TheAMPTEC601ES
DMMresistancerangesgoincontinuous
decadesfrom2.0Ohmsto20KiloOhms.The
selectionofthe(2.0Ohm)lowestresistance
rangeisaccomplishedbyrotatingtherange
knob.Alignindicatormarkonknobwiththe
desiredresistancerangeoffunctiontothe
1O’clockposition.Bycontinuingtorotatethe
Function/Rangeselectknobinaclockwise
direction,theoperatorselectsthenexthigher
range(i.e.from2.0Ohmto20.0KOhmrange
etc.).
Thisfunctionallowsthe
usertoverifyvoltagemeasurement(i.e.the2.0
Vrange)andthestraycurrentmeasurementis
workingproperly.TheAMPTEC601ESDMM
cangiveoutasignalsourceof50mVor5mA.
Toverifyvoltage;settherangeswitch(item
#11)tothe2.0voltrange.Depresssignal
sourcepushbutton,theLCDdisplayshould
indicateapprox.0.0500Volts.
ToverifytheStrayCurrentfunction;setthe
rangeswitchtothe2AMPrange(item#12).
Depressthesignalsourcepushbutton,and
press/holdtheStrayCurrent
measurebutton.Thedisplayshouldindicate
approx.0.0050Amperes.
-WhentheAMPTEC601ES
DMMcaseisclosed,pressdown(placepalmon
thelidcorner,inordertocompressthe
o-ring)whileflippingupthelatch(seeitem
#16)toopenupthe601ESDMM.ThePurge
Valve(item#2)shouldopeniftherehasbeenan
atmosphericpressurechange.
simultaneously
2.0KOHM
20OHM
200OHM
2.0OHM
20KOHM
FUNCTION/RANGE
2AMP
AC/DC
600VRMS
200V
AC/DC
20V
AC/DC
2.0V
AC/DC
2AMP
AC/DC
STRAYCURRENT
PRESSTOMEASURE
MILLAMPERES
milliammeter
0-10mADC
PRESSTOMEASURE
+HIGH
LOW
V
VLO
VHI
I
50mV-5mA
SIGNAL
SOURCE
press/hold
Sect.D-Operation,FunctionalSelf-TestandUse
13

17.O-ringWaterTightSeal-
18.PadlockHoles
19.AMPTEC601ESDMMTestLeads
Underneaththe
AMPTEC601ESDMMmainpanelisasponge
rubbero-ring.AsecondO-ringislocatedinside
therimoftheAMPTEC601ESDMMlid.When
thelidislatchedshut,theo-ringinthelidis
compressedandprovidesadusttightandwater
resistantseal.
-TheAMPTEC601ES
ExplosiveSafetyDMMcanbelocked(i.e.
duringtransit)tohelppreventtamperingand
provideaddedsecurity.
-All
AMPTECseriestestleadandprobesetsarea
minimum48"length,dualbananaterminationat
theohmmeterend(calltheSalesDepartmentat
AMPTECRESEARCHforanycustomrequire-
ment).
IGNITERTESTER
*
*contactresistance
*
COMPLIANCE
VOLTAGE
LIMITED
CONSTANT
CURRENT
SOURCE
LEADRESISTANCE
LEADRESISTANCE
D-4.4-WireKelvinResistanceMeasuremen
testleadwiring
resistanceandcontact
resistance
t
TheAMPTEC601ESDMMcanbea2wire
methodresistancemeter.Withall2wire
resistancemeters,all
testleadconnection
isinserieswiththe"resistanceunder
test"andasaresultaresistanceerrororoffset
maybegenerated.Fig.D-4illustrateshowthe
4-wireprincipleisusedtoeliminatelead,wire
andcontactresistancesaspotentialerror
sources.Theinternalfailsafeconstantcurrent
sourceinherentlyovercomesallseriesresistance
(withincompliancevoltagelimits)anddelivers
apreciseconstantcurrent.Thecompliance
voltageoftheAMPTEC601ESDMMconstant
failsafecurrentsourcewilldropasthe
resistanceundertestincreasestomaintain
IGNITERTESTERKELVINBLOCKDIAGRAM
FIG.D-4
constantcurrent(i.e.5mAonthe2.0ohmand
20ohmranges).Theconstantcurrentmaybe
thoughtofasinaloopfromouttothe
“UUT”andbacktotheAMPTEC601ESDMM
throughthejack.Dependinguponthe
magnitudeoftheresistanceoffset,someofthe
offsetmaybecorrected(zeroedout)forinthe
AMPTEC601ESDMMbyadjustingthezero
knobonthefrontpanel.Thefour-terminal
configurationoftheAMPTEC601ESDMM
eliminateserrorsnormallycausedbyinseries
testleadresistanceandcontactresistance(s).In
manyapplicationsthecontactresistanceandcan
exceedthevalueofthetestresistancebyseveral
ordersofmagnitude.TheAMPTEC601ES
DMMovercomesthispotentialerrorsourceby
providingtwoterminalsofconstantcurrentand
anadditionaltwoterminalsforhighimpedance
voltagemeasurement.SeparateDCtoDC
isolationcircuitryprovidesindependentcircuit
voltagesuppliesforboththeconstantcurrent
sourcecircuitandthevoltmetercircuit.The
internalhigh-impedanceDCDigitalVoltmeter
(DVM)sensesthevoltagedropacrossthetest
resistance(i.e.igniter/squibordetonator).There
isnegligiblecontactandleadresistanceerror
createdbythevoltagemeasurementbecausethe
highinputimpedanceoftheDVMlimitscurrent
flowinthevoltage(and)leads.
Whenin4WireKelvin(Ohms)mode,thefour
terminalsusedarecurrenthigh(),current
low()aswellasthevoltagesensehigh
()andvoltagesenselow().The
unit’stoptwobindingpostslabeled
areand.Theunit’slower
twobindingpostslabeledare
and
Fig.D-5illustrates4WireKelvinconnections
fromtheunit’sbindingpoststotheresistance
undertest.Goldplated4wireKelvinCliptest
leads(Option300)arenormallysuppliedwith
theAMPTEC601ESDMM.TheKelvinClips
I
I
VV
D-5.Connections
I
I
VV
+
HighVI
Low
VI.
HIGH
LOW
’
hilow
HIGH
LOW
HIGHLOW
HIGHHIGH
LOWLOW
horizontal
horizontal -
2Wire
4Wire
Resistance
under
test
+HIGH
LOW
V
LO
LO
HI
HI
I
I
I
4WIREKELVINOHMUSESALL4TERMINALS
FIG.D-5
Sect.D-Operation,FunctionalSelf-TestandUse
14

haveaninsulatordelrinspoolthatseparatesthe
upperjawfromthelowerjawoftheclip.Withtwo
oftheclipsyouhavea4wireKelvinconnection.
The601ESExplosiveSafetyDMMbeingafour
wireKelvinresistancemeteroftentimemayhave
andleads
(disconnected)fromineverything.
Whennothingisconnectedinthefourwire
resistancemodeandiftheleadsaren'tshorted
togetherthedisplaymayappeartowander(i.e.
"").The
HighImpedanceDVMcircuitmustreceivea
voltagesignal/inputtodisplaythepropervalue.
Forthe601ESExplosiveSafetyDMMthisisnota
problemwhenisshortedto
(2wiremethod)andisshortedto
.
TheAMPTEC601ESDMMSeriesofSafety
Metersallincorporateaconstantcurrentsource
designthatrendersthemincapableofdelivering
excessivevoltageorcurrenttothedeviceunder
test.Thefail-safecurrent(<10mA)foreachrange
isindicatedsectionBofthismanual.Pleaserefer
tosectionforatechnicaldescriptionofthe
failsafecircuitryspecifics.
Itisimportanttoavoidtoomany2wireadapters
andconnectionsinserieswiththe"resistance
undertest"ifpossible.Atestwire
harnessorora(i.e.
twistedpair)thatiscanbecomeareal
intermittentresistancemeasurementerrorproblem.
Afatiguedadapterorlooseconnector,plug,or
wiresplicewilloftentimeschangestheircontact
resistancecharacteristicsastheconnectionwiring
ishandled.Looseadapters,connections,and
plugs,arepotentiallyoneofthelargestsourceof
resistancemeasurementerrorsandshouldbe
recognizedandavoided.Asageneralrule,whenit
comestomeasuringelectricalresistance,
youcanmaketothe"device
undertest"
Iftheindicator
isdisplayed,the601ESDMMreadingsshouldnot
betrusted.
VoltagehighVoltagelowsense
measuremodewithnothingconnected
VoltagehighCurrent
highVoltagelow
Currentlow
open
circuited
E-5
D-6.FatiguedAdaptersandLooseConnections
-CommonSourcesofMeasurementError
D-7.BatteryMonitoringCircuitry-
fatigued
adapterwire/plugwiresplice
loose
thefewer
theconnections
thefewertheproblems.
TheLCD
display""
""
willindicatewhenitistimeto
replacethebatteries.
LOBAT
LOBAT
The
TheAMPTEC601ESDMMSeriesofSafety
Metersallincorporateaconstantcurrentsource
designthatrendersthemincapableofdelivering
excessivevoltageorcurrenttothedeviceunder
test.Thefail-safecurrent(<10mA)foreach
rangeisindicatedsectionBofthismanual.
Pleaserefertosectionforatechnical
descriptionofthefailsafecircuitryspecifics.
The601ESExplosiveSafetyDMMIgniter
Testerreceivesit’spowerfromaninternal
re-chargeablebatterypack-4“AA”batteries
housedbehinditsmetalbatterybox.
WhenthelowerportionoftheLCDdisplay
indicatestheAMPTEC601ES
ExplosiveSafetyDMMisinoverrangemode.
Makesurethetestleadsareconnectedtothe
“UUT”.The“OverrangeState”canoccur
wheneverthemeasurementterminalsareopen
circuit(notconnectedtoanything),orthe
measurementundertestis“higherthanthe
selectedrange.Themostcommonwayto
correctforan“overrangeconditionistoselect
thenexthigherrange.Ofcourseifyouralready
atthehighestresistancerange,forexample(20
kiloOhm),thentheinstrumentisinformingyou
thattheisahigherlevel
than20kiloOhms,possiblyan“opencircuit".
D-8.FailsafeOperationOverview
E-5
“>>>OR”
OverrangeIndication:
”
resistanceundertest
""LOBAT
.-
willtypicallycomeonwhen
theAMPTEC601ESDMMinternalbatteries(4
ea.15VDCalkalinesDuracellUltraorbetter)
reachapprox.3.6VDC.Tochangethebatteries
removethescrewssecuringthebatterycompart-
ment.Thebacksideofthebatterycompartment
coverislinedwithaspongefillneoprenegasket
tohelpprovideawaterresistantbatterycom-
partment.Carefullypullthebatteryholderout
andremovethecable-tiesecuringthebatteries.
Observebatterypolaritywhenreplacingthe
"AA"batteries.Re-securethefournewbatter-
iesintheholderwithanewcabletie,then
returnittothebatterycompartmentandre-
securethecompartmentlid(screws).See
SectionA-4fordiagram.
Sect.D-Operation,FunctionalSelf-TestandUse
15

CHAPTERE-GENERALOPERATIONANDDESIGN
E-1.General
Alldiagramsand
informationdisclosedinthischapteris
proprietary
E-2.Troubleshooting
TheAMPTECRESEARCH601ESExplosive
SafetyDMMIgniterTesterisshowninblock
diagramforminFigureE-1.
andisincludedinordertomake
troubleshootingtocomponentlevelpossible.
TheAMPTEC601ESExplosiveSafetyDMM
Seriesusesmodernsolid-statesemiconductors
exclusivelyanddigitalCMOScircuitsexten-
sivelytominimizepowerrequirementsand
makebatteryoperationusefulandpractical.
AMPTECRESEARCHalsomaintainsaspare
partsinventoryofallcomponentsfoundinthe
601ESExplosiveSafetyDMMtesterandit’s
customerservicedepartmentcanalsoprovide
additional assistanceinthetroubleshooting
process.
SincetheAMPTEC601ESExplosiveSafety
DMMIgniterTesterisusedtotestpotential
deadlyexplosiveforcedetonatorsandwarheads
ofmissilesetc.,
.
ApparentAMPTEC601ES
alfunctionscansometimesbetheresult
ofbadtestlead/connectionwiring,wrong
connections,misinterpretationofspecifications,
lowbatterylevelsandinrarecasesduetoan
incompleteunderstandingoftheinstrumentand
howtouseit.Athoroughreviewoftheoperat-
inginstructionsforthisinstrumentisrecom-
mendedpriortoanycomponentreplacement.
Checktobesurethatcablesandothertest
equipmentareingoodworkingorderbefore
attemptingtotroubleshootthe601ES
series.
theAMPTEC601ESExplosive
SafetyDMM,
itmayindicatethebatteriesneedchanging.
personnelthatarenotqualified
tomakesuchelectricalrepairsonthe601ES
ExplosiveSafetyDMMshouldnoteven
attempttoremovethecalibrationaccessscrews
oropenthemainpaneloreffectanyrepair
whatsoever
Ifyouturnon
displaydoesnotcomeon
ExplosiveSafety
DMMm
AMPTEC
ExplosiveSafetyDMM
andthe
IftheAMPTEC601ESExplosive
SafetyDMMexhibitsproblems
thatcannotbeeliminatedby
reviewingChaptersBandD,thefollowing
guidelineshavebeenestablishedtohelpsolve
theproblem.
Thekeytosuccessfultroubleshootingisto
localizetheproblemtoageneralelectronic
parameterasmuchaspossiblebeforetryingto
pintheproblemdowntoaspecificcomponent.
Certainquestionsshouldbeaskedsuchas"Does
theproblemoccuronallrangesoronaspecific
rangeonly?"IftheAMPTEC601ESExplosive
SafetyDMMdoesnotcome"on"whenpowered
up,didyouchecktheobviousitemssuchas
deadbatteries?Isthere5mAoftestcurrent
comingoutoftheunits20ohmrange?The
powersuppliesforboththecurrentsourceand
thedigitalvoltmeterelectronicsarealsooneof
thefirstthingsthatshouldbetested.
ExplosiveSafety
DMM
ascorrosionof
componentsleadsandPCBetchlosscanoccur.
E-3.LocalizingtheProblem
Asitisnotpossibletoanticipateallpossible
failuremodesoftheAMPTEC601ESExplosive
SafetyDMMseriesignitertester,service
personnelshouldbecomefamiliarwiththis
sectiontogainacompleteunderstandingofthe
internalworkingsofthissafetymeter.
Ifthemalfunctionisafaultycomponent,the
accuracyoftheAMPTEC601
ignitertester
andthe
followingprecautionsaretaken:
Useonlythespecifiedcomponentoritsexact
equivalent.Sparepartscanbeorderedfrom
AMPTECRESEARCHbyreferringtothe
AMPTECStockNumberlistedinthePartsLists
sectionatthebackofthismanual.
Thehighestquality63/37graderosincore
electronicgradesolderwitha50Worlower
maximumpowersolderingironshouldbeused.
E-4.ComponentReplacement
canbemaintainedonlyif
the601ESisre-calibratedfollowing
componentreplacement
AMPTEC
a(repair)
Neveruseanacidcoresolder
16

Whensoldering,heatthePCBpadandtheleadofthecomponent,notthesolder.Afterseveralsecondsofthe
componentleadincontactwiththehotsolderingironapplysoldersmoothlyandevenlyontothePCBpad
andcomponentleadnotthesolderingiron.Donottouchormovethereplacementpartuntilthesolderhas
cooled.Coldsolderandbadsolderjointscancausemoreproblems.
Usetheunit'schassisgroundconnection-i.e.connecttoanearthgroundtoavoidastaticdischargetoastatic
sensitivecomponent.HandleallAMPTEC601ESDMMinternalcomponentsasiftheyarestaticsensitiveif
youarenotsure.
E-5.CircuitDescriptions
E-5.1Model601ESIC401-DVMIC-MAX7129-DetailedDescription
TheMAX7129isauniquelydesignedsinglechipA/Dconverter.TheAMPTEC601ESExplosiveSafety
MeterDVMmeasurementcircuitfeaturesanewsuccessiveintegration"techniquetoachieve5µVresolution
ona100mVfull-scalerange.Toachievethisresolutiona10:1improvementinnoiseperformanceoverpre-
viousmonolithicCMOSA/Dconverterswasused.Previousintegratingconvertersusedanexternalcapacitor
tostoreanoffsetcorrectionvoltage(dualslopeintegration).Thistechniqueworkedwellbutgreatlyin-
creasedtheequivalentnoisebandwidthoftheconverter.TheMAX7129removedthissourceoferror(noise)
bynotusinganauto-zerocapacitor.Offsetsarecancelledusingdigitaltechniquesinstead.Savingsinexter-
nalpartscostarerealizedaswellasimprovednoiseperformanceandeliminationofasourceofelectromag-
neticandelectrostaticpick-up.
IntheoverallFunctionalBlockDiagramoftheMAX7129theheartofthisA/Dconverteristhesequence
counter/decoderwhichdrivesthecontrollogicandkeepstrackofthemanyseparatephasesrequiredforeach
conversioncycle.Thesequencecounterisconstantlyrunningandisaseparatecounter fromtheup/down
resultscounterwhichisactivatedonlywhentheintegratorisde-integrating.Attheendofaconversionthe
dataremainingintheresultscounterislatched,decodedandmultiplexedtotheliquidcrystaldisplay.
TheanalogsectionblockdiagramshowninFIG.H-7includedalloftheanalogswitchesusedtoconfigure
thevoltagesourcesandamplifiersinthedifferentphasesofthecycle.Theinputandreferenceswitching
schemesareverysimilartothoseinotherlessaccurateintegratingA/Dconverters.Thereare5basicconfig-
urationsusedinthefullconversioncycle.
FIG.H-9illustratesatypicalwaveformontheintegratoroutput.INT,INT1,andINT2allrefertothesignal
integratephasewheretheinputvoltageisappliedtotheintegratoramplifierviathebufferamplifier.Inthis
phase,theintegratorrampsoverafixedperiodoftimeinadirectionoppositepolaritytotheinputvoltageto
thedisplaydriverfordecodingandmultiplexing
DE1,DE2andDE3arethede-integratephaseswherethereferencecapacitorisswitchedinserieswiththe
bufferamplifierandtheintegratorrampsbackdownthelevelitstartedfrombeforeintegrating.However,
sincethede-integrationphasecanterminateonlyataclockpulsetransition,thereisalwaysasmallovershoot
oftheintegratorpastthestartingpoint.TheICL7129amplifiesthisovershootby10andDE2begins.
SimilarlyDE2'sovershootisamplifiedby10andDE3begins.AttheendofDE3theresultscounterholdsa
numberwith5½digitsofresolution.Thiswasobtainedbyfeedingcountsintotheresultscounteratthe3½
digitlevelduringDE1,intothe4½digitlevelduringDE2andthe5½digitlevelforDe3.Theeffectsofoff-
setinthebuffer,integrator,andcomparatorcannowbecancelledbyrepeatingthisentiresequencewiththe
inputsshortedandsubtractingtheresultsfromtheoriginalreading.ForthisphaseINT2switchisclosedto
givethesamecommon-modevoltageasthemeasurementcycle.ThisassuresexcellentCMRR.Attheend
Ofthecyclethedataintheup/downresultscounterisaccurateto0.02%offullscaleandissen.
Sect.E-GeneralOperationandDesign
17

E-5.2AMPTEC601ESResistance
E-5.5MICROPROCESSOR
E-5.6DIGITALVOLTMETER
TheAMPTEC601ESresistancemeasurementfunctionworksusingtheprincipleofOHM'SLAW
(V/I=R).ItoutputsaconstantDCcurrentthroughtheunknownresistancethenmeasuresthevoltagedrop
acrosstheresistance.ThemeasurementcircuitthenscalesmagnitudeanddisplaystheV/Iratio
asresistance.Forexample,the2Ohmrangeoutputsaconstant5.0mA.When5.0mApassesthrougha
1.0Ohmresistortheresultisa5.0mVdrop.Wethenroutethemeasuredvoltagedrop(i.e.5.0mV)intothe
andget50.0mV,whichisroutedintotheDVMchip(MAX7129)whichdrivesthe
LCDdisplayas1.0000Ohm.The20Ohmrangealsooutputs5mAofconstantfailsafecurrent.When5mA
isroutedthrougha10ohmresister,youget50mV.
10.000Ohms.The200Ohmrangeoutputs500uA.Putthatacrossa100
Ohmresisterandyouget50mVwhichputintothedisplays100.00Ohms.As
therangeresistancegoesupbyafactorof10.Thecurrentgoesdownbyafactorof10keepingthe
voltageat50mV.
IC101isa5voltregulatorwithanenablepin4.Pin4normallysitsat+5VthroughRN101:3andRN101:1.
WhenthePowerswitchispressedSW101pin4ispulledtogroundthroughD101,and+5isturnedon
whichthengoestoIC102a5voltregulator.Oncethepoweristurnedonthemicroprocessorwakesupand
turnsonTR101,whichthenholdspin4lowkeepingthepoweron.Evenwhenthemomentarypowerswitch
isreleased.WhenthepowerswitchispressedagaintoturntheunitoffTR102isturnedonandasignalis
senttothemicroprocessoranditturnsoffTR101whichallowspin4togohighandturnsthepoweroff.
Themicrocanalsoturntheunitoffthesamewayafteracertaintimeperiodhaselapsed.Thisistosave
batterylifeSeeFIG.H-1.
ThemicrocanturnonTR201-TR209usingIC201andI202.Thesefetsareusedtosetandresetlatching
relaysonthecurrentboard.
DMM
601ESohms
DC
whichisalsoroutedintotheDVMchip(MAX7129)
whichdrivestheLCDdisplayas
DVMchip(MAX7129)itas
DC
C
TheconnectionismadethroughthreeribbonconnectorsJ201,J202,J203.A
signalalsocomesbackthroughtheseconnectorsindicatingwhichrelayisonandthisisusedtocontrolthe
decimalpointandKonthedisplay.SeeFIG.H-2.
IC301isthemicroprocessoritcanbeprogramedthroughP301whenJP301isinthePpositionandoperate
whenJP301isintheNposition.J302comesfromthefrontpanelrangeswitchtoletthemicroknowwhich
rangehasbeenselected.ItthensendsthenecessarysignaltoIC201andIC202onsheet2toselectthe
properFETtoturnontherangerelayonthecurrentboard.JP303isusedtotellthemicrowhichtimedelay
isselectedtoautomaticallyturntheunitoff.ItusesPTC1toturnthepoweronandoffandPTD7todetect
ifthepowerswitchwaspressed.Theselinesgotosheet1.Ic302isusedtotellifitsafetochangeranges.
SeeFIG.H-3.
IC402isanX10Amplifierusedforthe2Ohmrange.RL401isusedtoswitchtheamplifierinandout.
D401isthereferenceZener.RV401isusedtosetthereferencevoltageto500millivolts.Inthe100mV
measurementmode50mVinwilldisplay10000.RL402isusedtoswitchinanoffsetinconjunctionwith
thefrontpanelzeropotforthe2and20Ohmranges.RL403isusedforthe200Ohmrange.Above200
Ohmsonoffsetisused.P401isusedtosendthedisplayinformationtothefrontpanelLCDdisplay.See
FIG.H-4
x10Amplifiercircuit
E-5.3POWERSUPPLY
E-5.4RELAYCONTROL
.
Sect.E-GeneralOperationandDesign
18

CHAPTERF-CALIBRATIONANDMAINTENANCE
F-1.General
Thissectionofthemanualcontainsroutine
maintenanceinformationregardingthe
AMPTECRESEARCH601ESSafetyDMM.
Calibrationshouldbeperformedonaregular
basistoensurecontinuedinstrumentaccuracy
orfollowingamainPCBelectroniccomponent
repair/replacement.Therecommended
calibrationintervalis1year.
inordertoeliminateleadresistance
andcontactresistanceerrors.TheOption“300”
isagoldplated4WireKelvinClipTestLead
setthatisavailablewiththeAMPTEC601ES
DMM.
AMPTEC601ESDMMCalibrationnote:
verify@60Hz
Fortheresistancefunction,theAMPTEC
601ESSafetyDMMmustbecalibratedusing
fourwireKelvinconnectionstotheresistance
standard
F-2.RequiredTestEquipment
Followingstandardresistorsarerequiredto
calibratethe601ESExplosiveSafetyMeter
IgniterTester.
1ohm±0.01%Accuracy
10ohms±0.005%Accuracy
1000ohms±0.005%Accuracy
10Kohms±0.01%Accuracy
600V±0.05%orbetteraccuracy
100V±0.05%orbetteraccuracy
10V±0.05%orbetteraccuracy
1.0V±0.05%orbetteraccuracy
600V±0.05%orbetteraccuracy
100V±0.05%orbetteraccuracy
10V±0.05%orbetteraccuracy
1.0V±0.05%orbetteraccuracy
1.0ampere±0.05%orbetteraccuracy
PrecisionResistanceStandards:
DCVoltageStandard:
ACVoltageStandard:
AC/DCCurrentStandard:
F-3.CalibrationProcedure
F-3-1.ZeroOffsetAdjustment
1.
2.
A.
DMM
Functionand
Followingafull15minutewarm-up
period
OnlyOutofSpecification
SectionB
Noadjustmentsareneeded
-
-Verifyeachfunctionandrangewiththe
appropriatecalibrationstandardstodetermineif
theAMPTEC601ESDMMmeetsitspublished
accuracyspecificationsaspublishedinSectionB
(p.7).
-Ifthe601ESmeetsthespecifi-
cationsascomparedwithtraceablestandardsthen
itisreadytocertifywithacalibrationstickeretc.
and"".
itsthePCBdirectlyunder
the""functions
()needtobeaddressedwithanyadjust-
mentprocedure
The601ES
DMMrequiresfullychargedbatteriesandafull15
minutewarm-ipperiodpriortoanyadjustments.
Thecalibrationadjustmentsareaccessedby
removingthe10calibrationaccessscrewsaround
theperimeterofthe601ESfrontpanel,then
liftingoffthetopplatebythehandles.The
locationsoftheadjustmentsareshownondrawing
number601ESExplosiveSafetyMeter-600atthe
backofthismanual.
Anyzerooffsetgreaterthanthespecification(
0.05%ofrangewhichis00.10onthe20Kohm
range)thenadjustasnoted
(seefigureH-14inthebackofthemanualfor
theDVMPCBlocation-
WiththeAMPTEC601ESDMMin4Wiremode,
selectthe20Kohmrange.ShortthefourWire
KelvinLeadstogetherattheends.
next.Ifthezeroreading
is>00.10thenadjustpotentiometerRV405tobeas
closeto00.00aspossible(itslocatedontheDVM
PCB)
VerificationofEachRanges
Accuracy
Usecautionwhenliftingthe
601EStoppanelupbythehandles,asthereis
umbilicalwiringthatconnectsthetoppanel
electronicstobatterypackwiringandchassis/case
groundwiringmountedinsidethebottomofthe
601EScase.Setthetoppanelonendrestingonthe
unit’sbezel.
19

onecorneroftheDVMPCBhasanylonwasher
actingasaninsulator/separatorfromitscorner
standoffsupport)
mustbe
.Savethisnylonwasherasit
bereturnedtoitsPCBmetalstandoff
locationwhentheadjustmentprocedureisfin-
ished.Slightlyliftandtilttherighthandsideof
theDVMPCBtogiveyouaccesstoallthe
DMMtrimpotlocations(neededforvoltage
andcurrentmeasurementadjustments).All
voltageadjustmentsshouldbeperformedwith
DCVoltageStandardinput
withanACVoltageStandard.DCVoltageinput
fromaDCVstandardprovidesthemoststable
AMPTEC601ESvoltagereadingforcalibration
purposes.
Selectthe600Vrangeandinput0.00VDC
fromtheDCVoltagestandard.AdjustRV101to
read000.0volts.
Stillonthe600Vrangeinput600.0VDC
fromtheDCVoltagestandard.AdjustRV102to
read600.0volts.
Selectthe200Vrangeandinput100.00VDC
fromtheDCVoltagestandard.AdjustRV105to
read100.0volts.
Selectthe20Vrangeandinput10.000VDC
fromtheDCVoltagestandard.AdjustRV104to
read10.000volts.
Selectthe2Vrangeandinput1.0000VDC
fromtheDCVoltagestandard.AdjustRV103to
read1.000volts.
Youmaynowverifyalltheabovevoltage
rangeswithinputfromanACVoltagestandard
todeterminecompliance.
Selectthe600Vrangeandprovide600VAC
@60Hzinput,thenverifytherangeisinspecifi-
cation.
Selectthe200Vrangeandprovide100VAC
@60Hzinput,thenverifytherangeisinspeci-
fication.
Selectthe20Vrangeandprovide10VAC
@60Hzinput,thenverifytherangeisinspecifi-
cation.
Selectthe2Vrangeandprovide1.0VAC
@60Hzinput,thenverifytherangeisinspeci-
fication.
Alltrimpotadjustments(i.eRV401)
describedforthissectionarealsolocatedonthe
DMMPCB.
thenlaterverify
3.
4.
5.
6.
7.
8.
A)
B)
C)
D)
F-3-6AC/DCCurrentAdjustments
1)
thebatterycompartment).Whenadjusting
RV405,whichisindicatedas
anegativesign.
Selectthe20Kohmrange.ConnecttheKel-
vinclipstothe10Kohmstandardresistor.
Selectthe20Ohmrange.ConnectKelvin
leadstotheAMPTEC601ESSafetyDMM.
ShorttheKelvinClipleadsattheend.
donotoveradjust
F-3-3.2.0OhmRangeAdjustmentscon't
(zero)
AdjustRV402ontheDVMPCBfora
readingof1.0000ohms.Overadjustmentis
indicatedbyanegativepolaritysign.
F-3-2.FullScaleAdjustment
1.
F-3-3.2.0OhmRangeAdjustments
1..
Therearenoadjustments
necessaryforthe20Ohm,200Ohm,and20
Kohmranges.
2.
2.
3.
AdjustRV401foradisplayindicationof
10.00Kohms.
foradis-
playindicationof.0000ohms.
Connectthetestleadstoa1.0Ohmresistance
standard.
Checkthe20KOhmrangewiththe
10.0KOhmStandardResistor.
AdjustRV403ontheDVMPCB
F-3-4.VerificationofEachRangesAccuracy
F-3-5AC/DCVoltageAdjustments
Checkthe20ohmrangewitha10ohmresis-
tancestandard.Checkthe200ohmrangewitha
100ohmresistancestandard.Checkthe2.0
KOhmrangewiththe1.0KohmStandard
Resistor.
Allresistance
rangesmustbewithinthespecificationsout-
linedinChapterB.
1.Theadjustmentsforthissectionisdifficultto
access,werecommendasimple
forallAC/DCVoltageandAC/DC
currentmeasurementstodetermineifthe
AMPTEC601SafetyDMMisadequatelyin
specification.IftheAMPTEC601ESDMMis
"inspec"youdonotneedtoperformtheadjust-
mentproceduredescribedinthestepsbelow.All
theadjustmentsdescribedinthissectionare
performedontheDMMPCB(
).
2.Keepingallribboncablesandwiringintact
betweenthevariousPCBs,remove
theDVMPCBfromitsstandoffmounts.(
verification
checkfirst
first
carefully
seefigureH-14
forPCBlocation,theDMMPCBisessentially
locatedbelowtheDVMPCBandtheIsource
PCB
note:
20