Guangzhou Liwei FR2000+ User manual

CONTENT
I. SafetyPrecautionsand Procedures............................................ 2
II. BriefIntroduction........................................................................ 4
III.Rangeand Acuracy................................................................... 5
.TechnicalSecifications............................................................. 5
Ⅴ .StructureofMeter .................................................................... 7
Ⅵ . LCDDisplay.............................................................................. 8
Ⅶ . Measuring Principle................................................................ 10
Ⅷ. OperationMethod ................................................................. 11
1.BootUp.............................................................................. 11
2. BatteryVoltage Check....................................................... 10
3. Resistance Test................................................................. 11
4.ClockSettings .................................................................... 13
5.AlarmSettings................................................................. 11
6. DateLock........................................................................ 14
7. DataStorage / Review / Delete....................................... 13
Ⅸ．BatteryInstructions............................................................... 14
Ⅹ．FieldApplication .................................................................... 14
Ⅺ． Accessories....................................................................... 21

.SafetyRules and Pecautions
Thankyou forpurchasing ourcompany's clampgrounding
resistance tester.Beforeusing the instrumentforthe firsttime,
inordertoavoidpossibleelectricshockorpersonalinjury,please
be sureto: readandstrictlyobservethesafetyrules and
precautionslistedinthismanual.
Inany case,use thisinstrumentshouldpayspecialattention to
safety
²The instrument isdesigned, producedand inspected
accordingtoIEC61010safetyspecifications.
²Inanycase, the use ofthisinstrument shouldpayspecial
attention tosafety.
²Whenmeasuring, high-frequencysignalgeneratorssuch as
mobilephones shouldnot be usednext tothe meter toavoid
errors.
²Payattention tothe textand symbolson the bodyofthe
instrument.
²Beforeuse, makesurethat the instrument and accessories
areingood conditionbeforeuse.
²Beforestarting the machine, press the trigger once or twice to
ensurethat the jawsareclosed properly.
²Donotmeasureinaflammableplace. Sparks maycause an
explosion.

²Donotwithholdthetriggerand do notclamp any
wires whenturning onthemeter
²After the power isturned on normally, the "OLΩ"symbolis
displayed, andthe measured object can beclamped.
²Donot place and storetheinstrument for along period oftime
under conditions ofhightemperature, humidity, condensation,
and direct sunlight.
²Whenreplacing the batterywiththe meter, make surethe
meteristurned off.
²The instrument displaysthebatteryvoltage low symbol
“”,shouldreplace thebatteryintime, otherwiseit will
leadtoground error.
²The jaw contact surfaces must be kept cleanand cannot be
wiped withcorrosives andrough objects.
²Whenopeningthe trigger,avoidthe impact ofthe clamp,
especiallythe jaw joint.
²Whenthe clampmetermeasuresthe resistance, the clamp
head willmakeaslight noise, which isnormal. Notethe
“deep-beep-beep--” soundthat distinguishesthe alarm.
²Payattention tothe measuringrangeand useenvironment
specifiedbythisinstrument.
²Donotmeasurethe leadcurrent abovethe upper limit ofthe
clampmeter.
²The use, disassembly, calibration and maintenanceofthis
instrument must be performedbyauthorized personnel.

²Because ofthe reason ofthisinstrument, if it isdangerous to
continue using it, itshouldbe immediatelystopped and sealed
immediately, and it shouldbe handledbyaqualified
organization.
²The ""safetywarning sign inthe instrument and manual
must be operated strictlyinaccordancewiththe contentsof
thismanual.
Ⅱ.BriefIntroduction
Clampgroundresistance tester,also knownas loop
resistancetester,isused totestgrounding resistance.The
instrumentuses anewblackluxuryscreen design,resistance and
currentdisplayinthe samescreen,and alsohas areal-timeclock,
datastorage,dataaccess,alarm,automaticshutdownand other
functions.The machine isbeautifuland upscale,hasawide range,
highresolution,convenientoperation,easytocarry,accurate,
reliable,stableperformance,strong anti-interferenceability.
Moreover,ithas ashockproof,dustproof,moisture-proofstructure
and isacommonlyused and indispensableinstrumentfor
telecommunications,electricity,meteorology,computerrooms,oil
fields,electromechanicalinstallation and maintenance,and
industrialenterprises thatuse electricityas industrialpoweror
energy.It issuitableformeasuringvariousgroundingresistances
such as telecommunications,electricity,meteorology,computer

rooms,oilfields,powerdistribution lines,transmission lines of iron
towers,gas stations,factorygroundingnetworks,and lightning
rods.
The clampgroundresistance tester iscontrolled bythe
microprocessorand canaccuratelydetectthe ground resistance.It
uses afastfilteringtechnique tominimizeinterference.Atthe same
timedatastorage anddataupload functions
Ⅲ.RangeandAcuracy
1.Ranges and AccuracyofMeasurement
Mode Range Resolution Accuracy
Resistance
0.010Ω-0.099Ω 0.001Ω ±（1%＋0.01Ω）
0.10Ω-0.99Ω 0.01Ω ±（1%＋0.01Ω）
1.0Ω-49.9Ω 0.1Ω ±（1%＋0.1Ω）
50.0Ω-99.5Ω 0.5Ω ±（1.5%＋0.5Ω）
100Ω-199Ω 1Ω ±（2%＋1Ω）
200Ω-395Ω 5Ω ±（5%＋5Ω）
400-590Ω 10Ω ±（10%＋10Ω）
Ⅳ. Rangeand Acuracy
Functions Groundresistancetest,Loopresistancetest
AmbientTemperature
and Humidity
23℃±5℃，below75%rh
PowerSupply DC 6V （4AAalkalinedrybatteries）

Range GroundResistance：0.01-500Ω
MeasureMethod Mutualinduction
ResistanceResolution
0.001Ω
Jaw Size 55mm×32mm
Clock Function Have
DisplayMode 4-digitLCD display,black screendesign
LCD Size 46mm×29mm
MeterSize L/W/H：285mm×85mm×58mm
MeasureTime 2times/second
DataStorage 500 groups，"MEM" storageindication,display"FULL"
symbolindicatesthat storageisfull
DataReview "MR" symbolindicateswhen looking up data
Overflowdisplay "OL" symbolindicatesover-rangeoverflow
InterferenceTest Automaticallyidentifyinterferencesignals,the"NOISE"
symbolindicateswhen theinterferencecurrentis large
AlarmFunction Alarm when themeasuredvalueexceeds thealarmsetting
value
BatteryVoltage Real-timedisplayofbattery power, remindingtimely
chargingwhen batteryvoltageislow
Automaticshut-down Turn offafter5minutes
PowerConsumption 50mAMax
Weight Meter：1180g(includingbattery)
Working Temperature
and Humidity -10℃～40℃；below80%rh

StorageTemperature
and Humidity -20℃～60℃；below70%rh
Insulation Resistance Above20MΩ(500Vbetween circuitandcase)
Pressureresistance AC3700V/rms(between circuitandcase)
External Magnetic
Field
＜40A/m
ExternalElectricField ＜1V/m
SuitableforSafety
Regulations
IEC61010-1(CAT Ⅲ300V、CATIV150V、Pollution
degree2)；IEC61010-031；IEC61557-1(earthresistance)；
Ⅴ.Structure of Meter
IV.StructureofMeter

1. ClampJaw2. Trigger3. LCD
4. POWERKey5. MODE Key6.ALAlarm FunctionKey
7.MEMKey8. SET Key9. HOLDKey
10.CALIBRATIONLOOP:1
11. CALIBRATIONLOOP:10
Ⅵ.LiquidCrystalDisplay
(1). Jaw Open Symbol
(2).AlarmSymbol
(3). SymbolofGreaterThan
(4). DC ACSymbol
(5). Symbolofdataaccess
(6). Symbolofdatamemory
(7). Noisesignal

(8). Datalocksymbol
(9). Symbolofbattery
(10). Resistance unit
(11). 4-digitalLCDfigures display
(12). Current unit
(13). 2-DigitalNo. OfDataStorage Unit
(14). 4-digitalLCDcurrentand clockdisplay
Description ofSpecial Symbols
. Symbolofan open jaw: Asajawisinthe openstate,
the symbolshows.Atthispoint, triggermaybe artificially
pressed,orthe jawshave been seriouslypolluted,and can
no longer continue tomeasure.
⑵. “Er”Boot-strap errorsymbol,Maybe pressing triggerorjaw
has been openedwhen thepower isturnon.
⑶.Symboloflowbatteryvoltage:whenthe batteryvoltage
islowerthan5.2V,the symbolshows,itcannotguarantee
accuracyofthe measurements.Batteries shouldbereplaced.
⑷. "OL "symbolindicates thatthe measured resistance has
exceeded theupper limit ofthe Meter.
⑸."L0.01 "symbol indicates thatthe measured resistance has
exceeded thelower limit ofthe Meter.
⑹. "OLA"symbolindicates thatthe measured currenthas
exceeded theupper limit ofthe Meter.
⑺.Alarmsymbol:when the measuredvalue isgreaterthan