Kyoritsu Electrical Instruments Works, Ltd. 6011A User manual

MODEL 6 011A
MULTI-FUNCTION TESTER
INSTRUCTION MANUAL
KYORITSU ELECTRICAL INSTRUMENTS WORKS，LTD.

1 ． SafeTesting............................................................................................. 1
2 ． Features.................................................................................................... 3
3 ． Specification............................................................................................ 6
4 ． Continuity(resistance)tests.................................................................. 10 
4 ． 1 Instrumentlayout.......................................................................... 10
4 ． 2 Testprocedure.............................................................................. 10
5 ． InsulationTests....................................................................................... 12
5 ． 1 Thenatureofinsulationresistance............................................ 12
5 ． 1 ． 2 Capacitivecurrent........................................................................ 12
5 ． 1 ． 3 Conductioncurrent....................................................................... 13
5 ． 1 ． 4 Surfaceleakagecurrent............................................................... 13
5 ． 1 ． 5 Totalleakagecurrent................................................................... 14
5 ． 2 Damagetovoltagesensitiveequipment................................... 14 
5 ． 3 Preparationformeasurement...................................................... 15
5 ． 4 Insulationresistancemeasurement............................................ 15
6 ． LoopImpedanceTests.......................................................................... 18
6 ． 1 Voltagemeasurement.................................................................. 18
6 ． 2 Whatisearthfaultloopimpedance?......................................... 18
6 ． 3 Automaticovertemperaturecutout.......................................... 18
6 ． 4 Theloopimpedancetest............................................................. 19
6 ． 5 Loopimpedanceat 3 phaseequipment.................................... 20
7 ． ProspectiveShortCircuitCurrent(PSC)tests................................... 21
7 ． 1 WhatisProspectiveShortCircuitCurrent?............................. 21
7 ． 2 TestingProspectiveShortCircuitCurrent................................. 21
8 ． RCDTests................................................................................................ 22
8 ． 1 PurposeofRCDTest................................................................... 22
8 ． 2 WhatdoestheRCDtestreallydo?........................................... 23
8 ． 3 UcTest........................................................................................... 23
8 ． 4 UcTesting..................................................................................... 23
8 ． 5 RCDtesting................................................................................... 23
8 ． 6 TestingRCD'susedtoprovidesupplementaryprotection..... 24
8 ． 7 TestingtimedelayedRCD's....................................................... 25
8 ． 8 TestingDCsensitiveRCD's....................................................... 25
9 ． Theexternalearthterminal.................................................................... 26
10
． General..................................................................................................... 27
11
． Batteryreplacement................................................................................ 27
12
． Fusereplacement................................................................................... 27
13
． Servicing................................................................................................... 28
14
． CaseandStrapassembly...................................................................... 29
CONTENTS

  1  
1. SAFE TESTING
Electricityisdangerousandcancauseinjuryanddeath.Alwaystreatitwiththe
greatestofrespectandcare.Ifyouarenotquitesurehowtoproceed,stopand
takeadvicefromaqualifiedperson.
1. This instrument must only be used by a competent and trained person and
operated in strict accordance with the instructions. KYORITSU will not
accept liability for any damage or injury caused by misuse or non-compliance
with the instructions or with the safety procedures.
2. It is essential to read and to understand the safety rules contained in the
instructions. They must always be observed when using the instrument.
3. This instrument is intended only for single phase operation at 230V AC
+10%, -15% phase to earth or phase to neutral operation, and then only for
loop, prospective short circuit current (PSC) and RCD testing. For use in the
continuity testing and insulation testing modes this instrument must be
used ONLY on circuits which are de-energised.
4. When conducting tests do not touch any exposed metalwork associated with
the installation. Such metalwork may become live for the duration of the test.
5. Never open the instrument case (except for fuse and battery replacement
and in this case disconnect all leads first) because dangerous voltages are
present. Only fully trained and competent electrical engineers should open
the case. If a fault develops, return the instrument to your distributor for
inspection and repair.
6. If the overheat symbol appears in the display ( ) disconnect the instrument
from the mains supply and allow to cool down.
7. For loop impedance tests to prevent unwanted tripping during loop testing all
residual current devices (RCD's) must be taken out of the circuit and
temporarily replaced with a suitably rated MCB unit. The RCD must be
replaced after the loop test is completed.
8. If abnormal conditions of any sort are noted (such as a faulty display,
unexpected readings, broken case, cracked test leads, etc) do not use the
tester and return it to your distributor for repair.
9. For safety reasons only use accessories (test leads, probes, fuses, cases,
etc) designed to be used with this instrument and recommended by
KYORITSU. The use of other accessories is prohibited as they are unlikely
to have the correct safety features.
10. When testing, always be sure to keep your fingers behind the safety

  2  
barriers on the test leads.
11. During testing it is possible that there may be a momentary degradation of
the reading due to the presence of excessive transients or discharges on
the electrical system under test. Should this be observed, the test must be
repeated to obtain a correct reading. If in doubt, contact your distributor.
12. The sliding shutter on the back of the instrument is a safety device. The
instrument should not be used if it is damaged or impaired in any way, but
returned to your distributor for attention.
13. Do not operate the function selector whilst the instrument is connected to a
circuit. If, for example, the instrument has just completed a continuity test
and an insulation test is to follow, disconnect the test leads from the circuit
before moving the selector switch.
14. Do not rotate function dial when test button is depressed. If the function
switch is inadvertently moved to a new function when the test button is
depressed or in lock-down position the test in progress will be halted. To
reset, release test button and press again to restart testing on new
function.
15. THE WIRING CHECK LED (P-E, P-N) of this instrument is to protect the user
from electrical shock resulting from incorrect connection of Line and
Neutral or Line and Earth.
When the Neutral and Earth conductors are incorrectly wired, the WIRING
CHECK LED function cannot identify the incorrect connection. Other
procedures and test must be conducted to check and confirm that the
wiring is correct prior to making measurement.
Do not use this instrument to check the correct wiring of the power supply.
Kyoritsu will not be held liable for any accident that may result from
incorrect wiring of the power supply line.

  3  
2. FEATURES
MΩ
AUTONULL/UcSWITCH
Fig. １
TestLeadforContinuityandInsulationTesting
TestLeadwithIECConnector LCDDISPLAY

  4  
Model 6011 AMulti-Functiontesterperformssixfunctionsinoneinstrument.
1 ． Continuitytester
2 ． Insulationresistancetester
3 ． Loopimpedancetester
4 ． Prospectiveshortcircuitcurrenttester
5 ． RCDtester
6 ． MainsvoltagewarningwhenoperatingtheloopimpedanceandRCDmode.
ThetesterisdesignedtoSafetyStandardIEC 61010 - 1 CATIII( 300 V).
Drip-proofconstructioninconformancewithIP
54 ,IEC 60529 .
Theinstrumentissuppliedwith:-
1 ． AKAMP 10 leadforloop/RCDtestingatsocketoutlets.
2 ． Model 7122 Bleadforinsulationandcontinuitytesting.
3 ． Model 7132 leadforlooptestingatExtemalEarthTerminal.
Intheinsulationresistancetestingmodetheinstrumentprovidesaratedcurrent
of 1 mAasrequiredinIEC 61557 - 2  1997 .
Inthecontinuitytestingmodetheinstrumentprovidesashortcircuitcurrentof
200 mAasrequiredinIEC 61557 - 4  1997 .
Continuityandinsulationresistancefunctionshavethefollowingfeatures:-
Livecircuitwarning A colourcoded LEDwarns ifthecircuitunder
testislive.
ContinuityNull Allowsautomaticsubtractionoftestlead
 resistancefromcontinuitymeasurements.
Polarityswitch Allows switching of polarity during continuity
tests.
Autodischarge Electric charges stored in capacitive circuits
are discharged automatically after testing by
releasingthetestbutton.
Loopimpedance,PSCandRCD  testingfunctionshavethefollowingfeatures:-
Voltagelevel In the loop impedance mode,supply voltage is
displayedwhentheinstrumentisconnectedto
thesupplyuntilthetestbuttonispressed.
Wiringcheck ThreeLEDsindicateifthewiringofthecircuit
undertestiscorrect.

  5  
Overtemperatureprotection Detects overheating of the internal resistor
(usedforloopand PSCtests)and ofthe
currentcontrolMOSFET(usedforRCDtests)
displayingawarning symbol( ) a n d
automaticallyhaltingfurthermeasurements.
15 mALoopmeasurement L oo p i mp edance 200 Ω  an d 2000 Ω range
measurementarecarried outwithlow test
current( 15 mA).
 Thecurrentwillnotcausetrippingoutinvolved
RCD eventheonewiththe lowestnominal
differentialcurrent(
30 mA).
DCTest AllowstestingofRCD'swhicharesensitiveto
DC fault currents. Phase angle is positive(
0 ﾟ )
only.
Autodatahold Holdsthedisplayedreadingforatimeafterthe
testiscomplete.
Autopoweroff Automatically switches the instrument offafter
aperiodofapproximately 10 minutes.The
power-offstatereturnsto normalwhenthe
rotaryswitchisre-settoanypower-onposition.
 Select UL (limit of touch voltage value) 25 V or
50 V.  In order to change it to 25 V,turnthe
poweronwithpressing AUTONULL/UC
SWITCH.
 Then it is set to 25 V can be reset to default
50 Vbyturningthe poweroff.Where UC
(contact voltage)exceeds UL value, "UcH" will
bedisplayedwithoutstartingthemeasurement.
OptionalAccessory OMA DIEC(Model 7133 B) distribution board or
lightingcircuit andtest leadforLOOP ／ PSC ／
RCDtesting.
ULvaluechange
andUCMonitoring

  6  
3. SPECIFICATION
Measurement Specification
Function Open Circuit
Voltage (DC)
Short Circuit
Current Range Accuracy
Continuity Greaterthan 6 V
Greaterthan
200 mA
20 / 200 / 2000 Ω
Auto-Ranging
± ( 1 . 5 %rdg+ 3 dgt)
Accuracyofthisinstrumentwillbeaffectedonthecontinuity
rangeifusedinproximityofradiotransmitters
Function Open Circuit
Voltage (DC) Rated Current Range Accuracy
Insulation
Resistance
250 V+ 40 % − 0 %
1 mAorgreater
@ 250 k Ω 
20 / 200 M Ω 
Auto-Ranging
± ( 1 . 5 %rdg+ 3 dgt)
500 V+ 30 % − 0 %
1 mAorgreater
@ 500 k Ω 
20 / 200 M Ω 
Auto-Ranging
± ( 1 . 5 %rdg+ 3 dgt)
1000 V ＋ 20 % − 0 %
1 mAorgreater
@ 1 M Ω
20 / 200 M Ω 
Auto-Ranging
± ( 1 . 5 %rdg+ 3 dgt)
Function Rated Voltage
(AC)
Nominal Test
Current at 0 Ω
External Loop
Range Accuracy
Loop
Impedance
230 V+ 10 %- 15 % 50 Hz 25 A 20 Ω ± ( 3 %rdg+ 4 dgt)
230 V+ 10 %- 15 % 50 Hz 15 mA 200 Ω ± ( 3 %rdg+ 8 dgt)
230 V+ 10 %- 15 % 50 Hz 15 mA 2000 Ω ± ( 3 %rdg+ 4 dgt)
@KAMP 10 Testlead
Prospective
ShortCircuit
Current(PSC)
230 V+ 10 %- 15 %
50 Hz
15 mA 200 A
PSCaccuracyisa
derivedfrommeasured
loopimpedance
specificationand
measuredvoltage
specification
25 A 2000 A
25 A 20 kA

  7  
Function
Rated Voltage
(AC)
Trip Current Trip Current
Duration Accuracy
RCDX 1 / 2
230 V+ 10 %- 15 %
50 Hz
10 / 30 / 100 / 300 /
500 / 1000 mA
2000 ms
TripCurrent:
- 10 % + 0 % of
rangeat 230 V
TripTime
± ( 1 %rdg
+ 3 dgt)
RCDX １
230 V+ 10 %- 15 %
50 Hz
10 / 30 / 100 / 300 /
500 / 1000 mA
2000 ms
1000 mA@ 200 ms
TripCurrent:
+ 10 % - 0 % of
rangeat 230 V
RCDX ５
230 V+ 10 %- 15 %
50 Hz
10 mA
50 ms
TripCurrent:
± 1 0 %  o f
rangeat 230 V
30 / 100 / 300 mA
(Note:on × 5 
rangemaximum
currentthatcan
begeneratedis
1 A)
TripCurrent:
+ 10 % - 0 % of
rangeat 230 V
Function Rated
Voltage Measuring Range Accuracy
VoltageMeasurement- 100 - 250 V 100 - 250 V 3 %rdg
Topreventwrongconnectionoftestleadsandtomaintainsafety,thededicated
terminals used for continuity and insulation tests are automatically covered
whenusingtheterminalsforloopimpedance,PSCandRCDtests
● TypicalNumberofTests(centraltendencyforsupplyvoltageupto 8 VatR 6 )
InsulationResistanceRanges : Approx. 500 timesmin.atload 0 . 5 M Ω
ContinuityRanges  : Approx. 300 timesmin.atload 1 Ω
LOOP.PSC.RCDRanges : Operationallifetime: 5 h ( I n c ase o f
continuousduty)
Operating error
● OperatingErrors(IEC 61557 - 2 ,- 4 )
Function Range
Measuringrangetokeep
operatingerror
Maximumpercentage
operatingerror
Insulation
250 V
500 V
1000 V
0 . 25 ˜ 199 . 9 M Ω
0 . 50 ˜ 199 . 9 M Ω
1 . 00 ˜ 199 . 9 M Ω±
30 %
Continuity
20 Ω
0 . 20 ˜ 19 . 99 Ω
200 Ω
10 . 0 ˜ 199 . 9 Ω
2000 Ω
100 ˜ 1999 Ω

  8  
Theinfluencingvariationsusedforcalculatingtheoperatingerroraredenotedasfollows;
Temperature: 0  ℃ and 35  ℃
Supplyvoltage: 8 Vto 13 . 8 V
● OperatingerrorofLoopImpedance(IEC 61557 - 3 )
Range Measuringrangetokeep
operatingerror
Maximumpercentage
operatingerror
20 Ω
0 . 4 ˜ 19 . 99 Ω
±
30 %
200 Ω
20 . 0 ˜ 199 . 9 Ω
2000 Ω
200 ˜ 1999 Ω
Theinfluencingvariationsusedforcalculatingtheoperatingerroraredenotedasfollows:
Temperature ： 0 ℃ and 35 ℃
Phaseangle ： Ataphaseangle 0 ゜ to 180 ゜
Systemfrequency ： 49 . 5 Hzto 50 . 5 Hz
Systemvoltage ： 230 V+ 10 %- 15 %
● Operatingerroroftripcurrent(IEC 61557 - 6 )
Function Operatingerroroftripcurrent
× 1 / 2
× 1
× 5
- 10 % 〜  0 %
 0 % 〜 + 10 %
- 10 % 〜 + 10 %
Theinfluencingvariationsusedforcalculatingtheoperatingerroraredenotedasfollows:
Temperature ： 0  ℃ and 35  ℃
Earthelectroderesistance ： max 20  Ω
Systemfrequency ： 49 . 5 Hzto 50 . 5 Hz
Systemvoltage ： 230 V+ 10 %- 15 %
Instrument dimensions:-  130 X 183 X 100 mm
Instrument weight:-  1080 gincludingbatteries.
Reference conditions  Specificationsarebasedonthefollowingconditions
exceptwhereotherwisestated:-
 1 ． Ambienttemperature: 23 ±  5 ℃
 2 ． Relativehumidity 45 %to 75 %
 3 ． Position:horizontal
 4 ． ACpowersource 230 V, 50 Hz

  9  
LED indication of live
circuit warning
LED indication of correct
Polarity
 5 ． DCpowersource: 12 . 0 V,ripplecontent 1 %or
less
 6 .Altitudeupto 2000 m
Battery type  EightR 6 orLR 6 batteries.
Low battery warning  " "symbolappearsinthedisplayandthebuzzer
beepsifthebatteryvoltagedropsbelow
8 V.
Operating temperature   0 to+ 40 ℃ ,relativehumidity 80 %orless,no
and humidity.  condensation.
Storage temperature  - 20 to+ 60 ℃ ,relativehumidity 75 %orless,no
and humidity  condensation.
 Illuminates if there is an alternating voltage of
50 V
ACormoreinthecircuitundertestbeforecontinuity
or insulation resistance tests. When DC voltage is
detected across the measuringterminalthe LED
lightsup.
 TheP-EandP-NLEDsilluminatewhenthewiringof
the circuit under test is correct. The reverse
lampislitwhenPandNarereversed.
Auto data hold  Intheloopimpedance,PSCandRCDtestfunctions,
theLCDreading isautomaticallyfrozen for
5 
secondsaftermeasurement.
Display  The liquid crystal display has 3  1 / 2  digits with a
decimalpointandunitsofmeasurement(
Ω ,M Ω ,A,
kA,Vandms)relativetoselectedfunction.
Overload protection  Thecontinuitytestcircuitisprotectedbya 0 . 5 A 600 
V fast acting
（ HRC ） ceramic fuse mounted in the
battery compartment, where a spare fuse is also
stored.
 The insulationresistancetestcircuitisprotectedby
aresistoragainst 1200 VACfor 10 seconds.
Mains Voltage Indication  Onconnectingtestleadstothecircuitunderteston
Loop, PSC and RCD ranges, the LCD reads V-PE.
Sign"V-PELo"or"V-PEHi"isalsoshownwhenthe
voltageis
100 V o r les s, o r 260 Vorgreater
respectively.

  10  
4. CONTINUITY（RESISTANCE）TESTS
#  WARNING
ENSURE THAT CIRCUITS TO BE TESTED ARE NOT LIVE.
DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH.
TO SELECT THE LOW RESISTANCE RANGE SELECTCONTINUITY
4．1 Instrument layout SeeFig 1 .
4．2 Test Procedure
Theobjectofcontinuitytestingistomeasureonlytheresistanceofthepartsof
thewiringsystemundertest.Thismeasurementshouldnotincludetheresistance
of anytestleadsused.Theresistanceofthetestleadsneedstobesubtracted
fromanycontinuitymeasurement.Model 6011 Aisprovidedwithacontinuitynull
featurewhichallowsautomaticcompensationforanytestleadresistance.
Proceedasfollows:-
1 ． Selectthecontinuitytestbyrotatingthefunctiondial.
2 ． Connecttheendsofthetestleadsfirmlytogether(seeFig 2 )andpressand
lockdownthetestbutton.Thevalueoftheleadresistancewillbedisplayed.
3 ． OperatetheAUTONULL/UcSWITCH,thiswillnullouttheleadresistance
andtheindicatedreadingshouldgotozero.
4 ． Releasethetestbutton.Pressthetestbuttonandensurethedisplayreads
zero before proceeding. While using the Continuity null function, "ohm"
symbol blinks.  The null value will be stored even if the function switch is
Fig 2

  11  
Fig 3
turnedtotheOFFposition.Thememorizednullvaluecanbecancelledby
disconnectingthetestleadsandpushingtheAUTONULL/UcSWITCHwith
thetestbuttonpressedorlocked.
CAUTION-before taking any measurements always check the leads have
beenzeroed.
5 ．  Connect the test leads to the circuit whose resistance is required (see Fig 3 
foratypicalconnectionarrangement).Havingfirstmadesure that the circuit
is not live.
Notethatthelivecircuitwarninglampwillilluminateifthecircuitis
live-butcheckfirstanyway!
6 ． Press the test button and read the circuit resistance from the display. The
readingwillhavethetestleadresistancealreadysubtracted.
7 ． Notethatifthecircuitresistanceisgreaterthan 20 Ω theinstrumentwillautorange
tothe 200 Ω ,ifitisgreaterthan 200 Ω itwillautorangetothe 2000 Ω range.
Note: If the reading is greater than 2000Ωthe overange symbol“OL”will
remain displayed.
Model 6011 Aisprovidedwithafacilitytochangethepolarityofthetestcurrent
used by the instrument during continuity tests. This can overcome affects
caused by the polarisation of the installation during testing which may give
inaccuratereadings.Tousethisfunctionproceedasfollows:-
1 ． Performacontinuitytestasoutlinedintheproceduresabove.
2 ． Operatethepolarityswitchifrequired.
3 ． Repeat the continuity testsandthe polarity of the test currentwillbe
reversed.
4 ． Acomparisoncanthenbemadebetweenthetwotestresultswhichshould
givethesamereading.

  12  
5. INSULATION TESTS
#  WARNING
ENSURE THAT CIRCUITS TO BE TESTED ARE NOT LIVE.
DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH.
TO SELECT THE INSULATION RESISTANCE RANGE SELECT
INSULATION
5．1 The nature of insulation resistance
Liveconductorsareseparated fromeachother andfromearth metalby
insulation, which has a resistance which is high enough to ensure that the
current between conductors and to earth is kept at an acceptably low level.
Ideally insulation resistance is infinite and no current should be able to flow
throughit.Inpractice,therewillnormallybeacurrentbetweenliveconductors
andtoearth,andthisisknownasleakagecurrent.Thiscurrentismadeupof
threecomponents,whichare:-
1 .capacitivecurrent
2 .conductioncurrent,and
3 .surfaceleakagecurrent.
5．1．2 Capacitive Current
The insulation between conductors which have a potential difference between
them behaves as the dielectric of a capacitor, the conductors acting as the
capacitorplates.Whenadirectvoltageisappliedtotheconductors,acharging
currentwillflowtothesystemwhichwilldieawaytozero(usuallyinlessthana
second) when the effective capacitor becomes charged. This charge must be
removedfromthesystemattheendofthetest,afunctionwhichisautomatically 
performed by Model 6011 A. If an alternating voltage is applied between the
conductors, the system continuously charges and discharges as the applied
voltage alternates, so that there is a continuous alternating leakage current
flowingtothesystem.

  13  
Fig 4
5．1．3 Conduction Current
Since the insulation resistance is not infinite, a small leakage current flows
through theinsulationbetweenconductors. SinceOhm's Lawapplies, the
leakagecurrentcanbecalculatedfrom
 Leakagecurrent( μ A)= appliedvoltage(V)
    insulationresistance(M Ω )
Fig 5
5．1．4 Surface Leakage Current
Where insulation is removed, for the connection of conductors and so on,
currentwillflow acrossthesurfaces oftheinsulation betweenthebare
conductors. The amount of leakage current depends on the condition of the
surfacesoftheinsulationbetweentheconductors.Ifthesurfacesarecleanand
dry,thevalueoftheleakagecurrentwillbeverysmall.Wherethesurfacesare
wetand/or dirty, thesurface leakage currentmay be significant.If it becomes
largeenough,itmayconstituteaflashoverbetweentheconductors.
Whetherthis happens dependson theconditionof theinsulationsurfaces and
on the applied voltage; this is why insulation tests are carried out at higher
voltagesthanthosenormallyapplyingtothecircuitconcerned.
Fig 6

  14  
5．1．5 Total Leakage Current
Thetotalleakagecurrentisthesumofthecapacitive,conductionandsurface
leakage current described above. Each of the currents, and hence the total
leakagecurrent,isaffectedbyfactorssuchasambienttemperature,conductor
temperature,humidityandtheappliedvoltage.
If the circuit has alternating voltage applied, the capacitive current ( 5 . 1 . 2 ) will
alwaysbepresentandcanneverbeeliminated.Thisiswhyadirectvoltageis
used for insulation resistance measurement, the leakage current in this case
quickly falling to zero so that it has no effect on the measurement. A high
voltage is used because this will often break down poor insulation and cause
flashover due to surface leakage (see 5 . 1 . 4 ), thus showing up potential faults
whichwouldnotbepresentatlowerlevels.Theinsulationtestermeasuresthe
applied voltage level and the leakage current through the insulation. These
values are internally calculated to give the insulation resistance using the
expression:-
Insulationresistance(M
Ω )=
Testvoltage(V)
     Leakagecurrent( μ A)
As the capacitance of the system charges up, so the charging current falls to
zeroandasteadyinsulationresistancereadingindicatesthatthecapacitanceof
thesystemisfullycharged.Thesystemischargedtothefulltestvoltage,and
will be dangerous if left with this charge. Model 6011 A provides an automatic
pathfordischargingcurrentassoonasthetestbuttonisreleasedtoensurethat
thecircuitundertestissafelydischarged.
Ifthe wiringsystem iswet and/ordirty, thesurface leakagecomponent ofthe
leakagecurrentwillbehigh,resultinginlowinsulationresistancereading.Inthe
case of a very large electrical installation, all the individual circuit insulation
resistancesareeffectivelyinparallelandtheoverallresistancereadingwillbe
low.The greaterthenumber ofcircuits connectedin parallelthelower willbe
theoverallinsulationresistance.
5．2 Damage to Voltage-Sensitive Equipment
Anincreasingnumber ofelectronic-baseditems ofequipment arebeing
connectedtoelectricalinstallations.Thesolidstatecircuitsinsuchequipment
arelikelytobedamagedbytheapplicationofthelevelsofvoltageusedtotest
insulation resistance. To prevent such damage, it is important that voltage-
sensitive equipment is disconnected from the installation before the test is
carried out and reconnected again immediately afterwards. The devices which
mayneedtobedisconnectedbeforethetestinclude:-

  15  
󱾀 Electronicfluorescentstarterswitches
󱾀 Passiveinfra-reddetectors(PIRs)
󱾀 Dimmerswitches
󱾀 Touchswitches
󱾀 Delaytimers
󱾀 Powercontrollers
󱾀 Emergencylightingunits
󱾀 ElectronicRCDs
󱾀 Computersandprinters
󱾀 Electronicpoint-of-saleterminals(cashregisters)
󱾀 Anyotherdevicewhichincludeselectroniccomponents.
5．3 Preparation for measurement
Beforetesting,alwayscheckthefollowing:-
1 ． The  lowbattery  Indication   isnotdisplayed
2 ． Thereisnovisuallyobviousdamagetothetesterortothetestleads
3 ． Test the continuity of the test leads by switching to continuity test and
shortingouttheleadends.Ahighreadingwillindicatethatthereisafaulty
leadorthatthefuseisblown.
4 ． MAKE SURE THAT THE CIRCUIT TO BE TESTED IS NOT LIVE. A
warninglampislitiftheinstrumentisconnectedtoalivecircuitbuttestthe
circuitaswell!
5．4 Insulation resistance measurement
Model 6011 Ahasaselectable,tripletestvoltageof 250 V, 500 Vand 1000 VDC.
1 ． Select the insulation resistance setting by rotating the function dial to the
requiredtestvoltage- 250 V, 500 V or 1000 Vasindicated underthe
 insulation  testsectionofthefunctionalswitch,aftermakingsurethatthe
instrumentisnotconnectedtoalivecircuit.
2 ． Attach the test leads to the instrument and to the circuit or the appliance
undertest(seeFigs 7 & 8 )

  16  
Note:Insulationtestingmustonlybeundertakenonde-energisedcircuits.
3 ． Ifthemainswarninglamplightsand/orthebuzzersoundsDONOTPRESS
THE TEST BUTTON but disconnect the instrument from the circuit. Make
thecircuitdeadbeforeproceeding.
Fig 8
4 ． Pressthetestbuttonwhenthedisplaywillshowtheinsulationresistanceof
thecircuitortheappliancetowhichtheinstrumentisconnected.
5 ． Note that if the circuit resistance is greater than 20 M Ω the instrument will
automaticallyrangetothe 200 M Ω reading.


Fig 7

  17  
6 ． WhentestingiscompletereleasethetestbuttonBEFOREdisconnectingthe
test leads from the circuit or from the appliance. This will ensure that the
charge built up by the circuit or the appliance during insulation test is
dissipated in the discharge circuit. In the discharging process, an LED
illuminatesandthelivecircuitwarningbuzzerwillsound.
#  CAUTION
NEVER TURN THE FUNCTION DIAL WHILE THE TEST BUTTON IS
DEPRESSED AS THIS MAY DAMAGE THE INSTRUMENT. NEVER
TOUCH THE CIRCUIT, TEST LEAD TIPS OR THE APPLIANCE
UNDER TEST DURING INSULATION TESTING.
Note ： If the reading measured greater than 200 M Ω the over range reading
 OL  willbedisplayed.

  18  
6. LOOP IMPEDANCE TESTS
DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST
BEFORE OPERATING THE FUNCTION SWITCH
TO SELECT THE LOOP TESTING RANGE SELECTLOOP
6.1 Voltage Measurement
Whenthe testerisset tothe looptest function,mainsvoltage isdisplayed as
soonasthe instrumentisconnected fortest.This voltagedisplayis
automaticallyupdatedevery 1 second.Thevoltagefunctionoperateswhenever
thetestbuttonisintheupposition.
6.2 What is earth fault loop impedance?
Thepathfollowedbyfaultcurrentasaresultofalowimpedancefaultoccurring
betweenthephaseconductorandearthiscalledearthfaultloop.Faultcurrent
isdrivenroundtheloopbythesupplyvoltage,theamountofcurrentdepending
onthevoltageofthesupplyandontheimpedanceoftheloop.Thehigherthe
impedance,thelowerwillbethefaultcurrentandthelongeritwilltakeforthe
circuitprotection(fuseorcircuitbreaker)tooperateandinterruptthefault.
To make sure that fuses will blow or that circuit breakers will operate quickly
enough in the event of a fault, the loop impedance must be low, the actual
maximum value depending on the characteristics of the fuse or the circuit
breakerconcerned. Every circuitmustbe tested tomakesure that theactual
loopimpedancedoesnotexceedthatspecifiedfortheprotectivedevice
concerned.
6.3 Automatic over-temperature cut-out
During the short test period the instrument dissipates power of about 6  kW. If
frequent tests are conducted over a prolonged period of time, the internal test
resistorwilloverheat.Whenthishappens,furthertestsareautomatically
inhibited and the over-temperature symbol ( ) appears in the display. The
instrumentmustthenbelefttocooldown,whentestingmayberesumed.