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DUOYI

DY4300

2/ 3/ 4-Wire Digital

Earth Resistance Tester

DUOYI Electronics Co., Ltd. CHINA

Address:2/F, ANLE INDUSTRY PARK, GUANKOU 2 ROAD,  NANTOU NANSHAN,SHENZHEN,CHINA

 Tel: 86-755-26977747,26977624Fax: 86-755-26976959

www.dyinstrument.com

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CONTENTS

1. Safety Warnings...................................... .... .............................. ......................... ....................12. Features...................................... ........................... ................................................................33. Specifications............................................ ......................... ....................................................34. Names of parts....................................................... ......................... .........................................55. Marks and messageson the LCD........................................... .....................................................66. Measurement Principle.............................. ...................... ........... ........... ........... ........... .........66-1. Principle of EarthResistance Measurements............ ........... ........... ........... .........................66-2. Principle of Earth Resistivity W Measurements......................... ........... ........... .................77. Preparation for Measurement..................................................................... ........... ...................77-1. Battery Voltage Check............................ ........... ........................ ......................... ...................77-2. Test parameter setting.................................................................................. .........................77-2-1 Setting Items.................................. .................................................. ..................................77-2-2 Setting for Measurement Method........................ ......................... .......................................87-2-3 Site (location) No. Setting..................................... ......................... .....................................87-2-4 Setting for the interval between Auxiliary Earth Spikes at Earth Resistivity  W  ...................97-2-5 Date and timesetting................. ........ ........ ........ ........ ........................... ........ ...................97-2-6 Setting for the residual resistance (Rk) onthe Test Leads......................................................107-3 Backlight............................................................... ........ ........ ... ......................... ..................117-4 Auto-Power-Off..................................................... ........ ........ ................ ......................... ....117-5 Auxiliary Earth ResistanceMeasurement........ ........ ........ ......................... ......................... ...117-6 Connection of EarthTest Leads and SimplifiedMeasurement Probes......................................118 Measurement Method............................................... ............................. ......................... ........118-1 Earth Resistance Measurement...................................... ........ .. ......................... ...................118-1-1 Precise Measurement (3-Wire)................................... ........ ... ...................... ......................118-1-2 Precise Measurement (4-Wire)...................................................................... .....................128-1-3 Simplified Measurement (2-Wire)......................................................................... .............138-2 Earth Resistivity  W .................................... ......................... ......................... ....................13

9. Batteries replacement..................................................... ......................... ...............................1410. Accessories................................................ ......................... ......................... ........................15

1. SAFETY WARNINGSThis instrument has been designed, manufactured andtested according to IEC61010: Safetyrequirments for Electronic Measuring apparatus, and delivered in the best condition after passingquality control tests. This instrument manual contrains warnings and safety rules which have to be observed by the user toensure safe operation of the instrument and to maintain it in safe condition. Therefire, read throughtthese operating instructions before using the instrument.

Instrumen t of signs in order to use security, you must read the instruct ion manual.

  The flag is divided into the followin g three kinds of attention to its content.

  WARNING·  Please carefully read this manual before use.·  Keep custody in order to access when needed.·  Please observe the instrument to use is specified in the manual.·  Understand and follow the safety instructions in the book.Must strictly comply withthe above instructions.Failure tocomply with instructions mayresult in injuries andaccidents.

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  DANGER: Indicate s to ignore this flag to the operation of error, resulting in a highrisk of death or serious injury.  WARNING: Indicate s to ignore this flag is wrong operation may cause death orserious injury.  Note: to ignore thisflag is wrong operationmay cause death orserious injury andequipment and other itemsof damage.

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  Danger· Do not use loop-to-groundvoltage AC/DC300V above.· Do not measured ininflammable places, may sparkand cause an explosion.· Do not use instruments or with wet hands.· Please note that thesimple measurement not tocause the metal headof the test lineand short-circuit of thepower cord.Doing so maycause personal injury.· Do not exceed the test range test input.·  When the t est line s are con nec ted, do n ot p ress the test butt onDo not open the battery cover in the the testing process.

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SYMBOLE

This instrument meets CAT.III 300V/CAT.IV 150V. To ensure safe operation of measuringinstrumens, IEC 61010 established safety standards forvarous electrical enviinments, categorizedasCAT.I to CAT.IV, and called measurement categories. Highrt-numbered categories correspond toelectrical envirinments with greater momentary energy, so a measuring instrument designed forCAT.III environments can enduregreater momentary energy thanone designed for CAT.II.

  Warning· Use, if the instrument or the test line cracking or metal parts exposed toimmediately stop the test· The analyte connection withthe test line, donot switch range.· Do not remove the instrument to carryout the decomposition, alteration,replacement alternative parts.· Repair or adjustment is required, please contact the us.·  When the ins trum ent i swe t, do not repl ace the batt ery.·  When usin g the tes t lin e, t he plug i s ful ly inser ted.·  When open the batt ery c over and repl ace t he b atte ries , please set t he range swit ch toOFF.

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Note· Before the test, makesure that the rangeswitch is set in the appropriate range.

·

 Afte r use , se t the ran ge s witc h to OFF, and remo ve th e tes tin g line.R emo ve th e batt ery, if l ong tim e not in use.· Do not place the instrument in high temperature, humidity, dew and direct sunlightplace.· Do not use abrasives or solvents to clean instrument. Pleaseuse the cloth toclean with neut ral de terg ent orw ate r.· Keep dry storage.· To ensure safety,please uesin the temperature range-10 ~ 50 , height of 2000mor less.

CAT.IV The circuit from theservice drop the serviceentrance,and to the power meter and primaryovercurrentprotection device(distribution panel)

Primary electrical circuits of the equipment connected directly to the distribution panel, and feeders from the

distribution panel to outlets.

CAT.III

Instrument with double orreinforced insulation.

User must refer to the explanstions in the instruction manual.

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10. Accessories1 x Auxiliary EarthSpikes4 x Earth Test Leads(one Red EarthTest Leads 15 meters, one Yellow EarthTest Leads 10 meters,oneGreen Earth Test Leads5 meters, one BlackEarth Test Leads 15meters )8 x 1.5V(AA) Batteries1 x manual1 x Certificate1 x Toolbox1 x Bags

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Terminals to be used : E, ES, S(P), H(C) TerminalsTest Leads : connect to the E,ES, S(P) and H(C) Terminals Auxi liar y Eart h Spi ke: 4 pcs(1) Setting of Wiring SystemSelect wire (r)with reference to8-2-2 Setting for measurement in this manual.Note) The instrument doesn't accept any setting change on Rk while measuring earth resistivity( r ).(2) Connection of Auxiliary Earth Spikes andTest LeadsStick the four Auxiliary Earth Spikes into the ground deeply. They should be aligned at an interval of1-30m. The depth shouldbe 5% or lessof the interval betweenthe spikes.

(e.g. The spike shouldbe stuck in the depth of 25cm orless when the interval of the Auxiliary EarthSpikes is 5m.)If the Spikes stucktoo deep, it mayresult in inaccurate earthresistivity measurement.Note) The supplied TestLeads can be used for the Spikesstuck at the intervalof max 20m.

Connect the green, black, yellow Test Leads connec ted to the E , ES ,S(P) and H(C) Terminals on the instrument to the Auxiliary Earth Spikes from the closest to thefarthest in this order.(3) Setting of theInterval between Auxiliary EarthSpikesThe inte rval of the Spikes should be entered a ccording to the se tting made at th e step of 8-2-5Setting for the interval between Auxiliary Eart Spikes at Earth Resistivity (r )(4) Earth Resistivity (r ) MeasurementSelect a Range (any Range is ok) when the connection is done, and press the TEST Button.Then the measured earth resistivity (r ) and the earth resistance Rg between the ES-S Terminalsare displayed.Press the ¬  Key to return tothe Main Screen.If the Rg value is too large, the display readsas shown.. In this case, rotate the Range Switch andselect an upper Range.Pressing the ¬  Key while the measured result of 8-2-5 describesthe detailed setting procedure.Note) The depth should be 5% or less of the interval between the spikes.If the Spikes stucktoo deep, it mayresult in inaccurate earthresistivity measurement.Note) Accurate earth resistivitymeasurement will be affectedand errors in measuredresult beco mes larg e if the Rg va lue i s sm alle r th an t he fu ll-s cal e val uea t the sel ecte d Ran ge. When the R gan r  values vary widely ateach Range, measurements should be made again at proper Rg Range.Note) If a message Rh>limit or Rs>limit appear on the LCD, auxiliary earth resistance is too highto make measurements. Recheck the connection ofTest Leads.

9 BATTERIES REPLACEMENT. When the cover iswet, do not openthe battery cover

·  Please do not replace the batteries when the instrument testing ; Avoid electrical shock, Turn therange switch to OFF before replace the batteries,and remove the test leads and auxiliarygroundingrods.·  Unscrew the battery cover screw and open the battery cover Replace the new batteries, put the batt ery c over and tigh ten the s crew s.

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Function Range Resolution Testing range

W

0 0 W

0 W

Earth resistanceRe

Earth resistancer =Rg

0.05± 2.09 W

W

W

0.5 ± 20.9 W

5± 209 W

 Acc urac y 

± ± W

± 3%rdg.± 5dgt(Remaks 1)

CAT.I: Secondary electrical circuits connected to an AC electrical outlet throught a transformer orsimilar device.

CAT.II:Primary electrical circuits ofequipment connected to an AC electrical outlet bya power cord.

CAT.III:See above tableCAT.IV: See above table

2. FEATURESDY4300 is a 2/ 3/ 4-Wire Digital Earth Resi stance/ Earth Resisti vity Tester equipped with amicrocomputer and can measure earth resistances and calculate earth resistivities (r )instrument can measure earthresistances on power distributionlines, in-house wiring systemandelectrical appliances etc. dueto the low output voltage: approx 10Vrms or less.

·  Designed to meet following safety standards.IEC 61010-1 (CAT.III 300V,CAT.IV 150V, Pollution degree2)IEC 61010-031(Requirements for hand-held Probes)IEC 61557-1, 5 (EarthResistance Tester)

·

 Stable measurement results can be obtained under a noisy environment by introducing the FFT(Fast Fourier Transform) technology.·  Dot-matrix 192x64, Monochrome LCD·  Backlight function to viewthe test results indimly areas·  Rk Function is available to cancel theresidual resistance on theTest Leads.·  Battery Check Function·  Auxiliary Earth Resistance Measurement Function Auxi liar y ear th re sis tanc es a rem easu red a nd di spla yed.·  Warning for Auxiliary Earth Resistance Measurements Warn ing s are dis playe d on the LCD when auxi liar y ear th resis tan ces a re to o high an d may res ult i ninaccurate measurements.·  Auto-Power-Off FunctionThe instrument is automaticallypowered off when 5min passes without anyKey operation.·  Data storageSave 1000 test data

3. SPECIFICATIONSIEC 61010-1 (CAT.III 300V,CAT.IV 150V, Pollution degree2)

IEC 61010-031 Requirements for hand-held ProbesIEC 61557-1, 5 (EarthResistance Tester)Test range (temperature andhumidity23± 5 45 75 RH)

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(4) Earth Resistance MeasurementSelect a Range (any Range is ok) when the connec tion is done, and press the TEST Button. Themeasured earth resistances Re are displayed on the LCD.The operation procedure issame to that for 3-Wire measurements.Note) If a message Rh>limit or Rs>limit appear on the LCD, auxiliary earth resistance is too high tomake measurements. Recheck theconnection of Test Leads.8-1-3 Simplified Measurement (2-Wire) *with Simplified Test ProbesUse this method when the Auxiliary Earth Spike cannot be stuck. In this method, an existingEarth Electrode with a low earth resistance, such as a metal water pipe, a common earth of acommercial power supply and an earth terminal of a building, can be used with the 2-Wire method.However, t he measure d earth resistanc es conta in the auxiliary ea rth resistan ce and the

resistance of the E Test Lead.

This instrument is supplied with a set of Simplified Measurement Test Leads for which both of Alli gato r Cli ps an d Fla tT est B ar ca n be repl aced and u sed i fn eces sary .Terminals to be used : E, S(P), H(C) TerminalsTest Leads: one to the E Terminal, Simplified Measurement Probes to the S and H Terminals andshort- circuit these Terminals. Auxi liar y Eart h Spi ke: Non e is used(1) Setting of Wiring SystemSelect Wire(2) with referenceto 7-2-2 Setting for Measurement Methodin thismanual.(2) Setting of Rk 1. Put the Alligator Clips to the 2 Test Leads (green, red), and connect the green Plug to the ETerminal and the two red Plugs to theS(P) and H(C) Terminalsrespectively.2. Select the2W or20WRange.3. Engage 2 Alligator clips to short-circuitboth of them.4. Save the Rkvalues with reference to7-2-6 Setting for the residual resistance (Rk) onthe TestLeads.Note) A break in Test Le ads or burnout o f Fuse is suspe cted when the LCD show Rk=OL W  while4 Test Leads arebeing shorted.(3) ConnectionConnect the Test Leadsas shown in Fig.16

Note) When the supplied Simplified Measurement Probes are not used, the S(P) and H(C)Terminals should be shorted.(4) Earth Resistance MeasurementSelect a high resistance Range when the connection is done, and press the TEST Button. Then theearth resistance values Reare displayed on theLCD. Select a lowerRange for the lowearthresistances.

(5) Measured resistances at simplified measurementsTwo-Wire method is used for the simplified measurements. In this method, earth resistance of theearthed electrode (re) connected to theS(P)Terminal is added tothe true earth resistanceRx and shown asan indicated value Re.

Re (indi cated value ) = Rx + reIf the Re is known befo rehand, true earth resistanc e value Rx is calculate d as follows.

Rx = Re -reNote) The Re cannotbe canceled by thesetting of Rk.8-2 Earth Resistivity (r ) MeasurementMaking a setting of the interval between Auxiliary Earth Spikes first andmeasuring the earthresistances with the 4 Auxiliary Earth Spikes stuck into the ground at even intervals. Then theinstrument can calculate anddisplay earth resistivity on the LCD automatically.

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(remarks 1) revised Auxiliary Earth Resistance 100W  Rk.(remarks 2) . a]1.0~30.0m·  Ground resistance test methods Volt age d rop m etho d (Pr obe curre nt a nd vo ltag e te sti ng)·  Test method of soil resistivity (r ): 4-pole·  Output: Test voltage Um Max 10Vrms 125Hz·  Te st cu rr ent Im M ax 8 0m A/ Im x R e+ Rh < Um·  Da ta s av e 1 00 0·  LCD Dot-matrix 192 x 64, monochrome Backlight·  Earth resistance: max 209.9k 

·

 Earth resistivity : 1W

m Series Interferenc e Voltage : max 50.9V ·  Low Battery Warning: Batterymark appears.·  Continuous Measurement: 400 timesor more with manganese batteries; repeating measurementsat every 30 sec with a load of 1 W·  Over-range Indication :OL·  Auto-Power-Off FunctionThe instrument is automaticallypowered off when 5min passes without anyKey operation.·  Location for use: Indoor/ Outdoor use (Not completely waterproof), altitude 2000m or less·  Applicable range: Testing earthresistance on power distributionlines, in-house wiring systemand electrical appliances·  Temperature & Humidity range(guaranteed accuracy) :23 ± 5 , relative humidity 85 or less (no condensation)·  Temperature and humidity range:0 40 ,relative humidity 85 or less (no condensation)·  Operating Temperature & Humidityrange :-10? ~ 50? , relative humidity 75 or less (nocondensation)* Supplied Test leads cannot be used at 0 or less.·  Storage Temperature & Humidityrange :-20 ~60 , relative humidity 75 or less (no

condensation)·  Overload Protection : betweenE-S(P) and between E-H(C)terminals AC280V / 10secetary ·  With stan d Vol tage : bet ween the elec tric al ci rcui t an den clos ure AC35 40V( 50/6 0Hz) / 5 se cet ary · Insulation Resistance : betweenthe electrical circuit andenclosure 50MW or more / DC1000·  Dimension: 167 L x 185 W x 89 D mm·  Weight:900g(including batteries)·  Power source DC12v:size AA manganese dry battery((R6P)*8**In a use of this instrument under low temperature below 0 , a use of alkaline batteries with lowtemperature spec is recommended.

Depending on the test value of Rg Between the auxiliary ground rods[

Soil resistance r2 x II x a x Rg

r =

(Remaks 2)

0.3~393.7W .m

3 3937W

 .m

0.03~39.37W .m

0.3~393.7W .m

3~1999W .m

Function Range Resolution Testing range

Earth resistance ReEarth resistancer =Rg

 Acc urac y 

± 3%rdg.± 5dgt(Remaks 1)

W 10 W 0.05~2.09 K W

k W 100 W 0.5~20.9 K W

 Auxi liar y ear thresistanceRh , Rs Re+Rh+Rs 8%

W

0 W

0 0 W

0 0 0 W

k W

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·  Operating error Operating error (B) from the error within the rated operating conditions, the use ofmachinery inherent errors (A and variable error (En) is calculated.

Inherent errorChanges by changes insupply voltageChanges by temperature changesSeries interference voltage changes

change by the resistance of auxiliary earth electrode

NAMES OF PARTS

 

 AE2E3E4

E5

·  Range to keep the maximum operating errorMeasurement range within which the maximum operating error ( ± 30%)applies.2W  Range:0.5W  ~ 2 .0 99W20W Range:2W  ~ 2 0. 99W200 W Range:20W  ~ 209.9W2000W Range:200W ~ 2099W20k W R an ge 20 k  W ~ 20.99k W200k W Range:20k W ~ 209.9k W

·   Variation of Supply Voltage: until the BatteryWarning mark appears·  Temperature Variation : -10 ~ 50·  Series Interference Voltage : 16, 2/3Hz, 50Hz, 60Hz, 400Hz and DC3V ·  No need to consider DC Series interferencevoltages at 2W·   Auxiliary earth electrode resistance : within following range or 50k W

4.

1 LCD2 TEST3 Background light4 ENTER/SAVE5 MENU

6 ESC7 Cursor Key 8 Range power9 E port10 ES port11 S port12 H port

Rh,Rs limit

Relimit or Rs>limit appear on t he LCD, auxiliary e arth resistance is toohigh to make measure-ments. Recheck the connectionof Test Leads.

8-1-2 Precise Measurement (4-wire)* with earth Test LeadsThe ES terminal isalso used with theother terminals used at the 3-wire Precise measurements.Inthis case, more preciseresults can be obtained because auxiliary earth resistancesof the measuredearth resistances are excluded,moreover, resistance of the Test Leads connectedto the E Terminalcan be canceled.Terminals to be used: E, ES, S(P), H(C) TerminalsTest Leads: Connect to the E, ES, S(P), H(C)Terminals (the ES Test Lead should be connected to the earthed equipment under test where the ETest Lead is connected) Auxi liar y Eart h Spi ke: 2 pcs

(1) Setting of wiring SystemSelect Wire(4) with reference to 6-2-2 Setting for Measurement Method in the manul.(2) Setting of Rk The measured results obtainedat 4-Wire system arenot be influenced by the Test Leads Connectedto the E Terminal, but setting of Rk can be made on this instrument.1. Firmly insert eachplug of 4 Test Leads (green, black, yellow,red), to the correspondingconnectorson the instrument.2. Select the 2Wor 20W Range.3. Engage 4 Alligator clips to short-circuitall of them.4. Save the Rkvalues with reference to6-2-7 Setting for the residual resistance (Rk) onthe TestLeads.Note) A break in Test Leads or burnout of Fuse is s uspected wh en theLCD shows Rk=OLW while4 Test Leads arebeing shorted.(3) Connection of Auxiliary Earth Spikes andTest LeadsStick the Auxiliary EarthSpikes S(P) and H(C) into the ground deeply. They should be aligned atan interval of 5-10m from the earthed equipment under test. Connect the green Test Lead tothe earthed equipment undertest, the yellow TestLead to the AuxiliaryEarth Spike S(P) andthe redTest Lead to the Auxiliary Earth Spike H(C).

The black Test Lead connected to the ES Terminal should beconnected to the earthedequipmentunder test.

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Note) The message shown in Fig.13 is also displayed when a fuse blows.Following message appears and shows that the data cannot be saved when the ENTER/SAVE Key ispressed with above display.Note) Following message appearsand shows that the200k W  or upper Ranges. TheRk values savedat 2 W  and 20W   Ranges are kept effectiveat 200k W .Note) Following message appearsand shows that the data cannot be savedwhen trying to saveRk at Wire (r ).7-3 BacklightTo facilita te working in dimly lit situatio ns or in night time, a bac klight funct ion is provided whichilluminates the LCD.Press the * Ke y to operate this functi on. The backlight will light up for about 30 sec and turned off

automatically.Pressin g the * Key while the backlight is on can turn it off.7-4 Auto-Power-Off This instrum ent is automati cally powered off about in 5 min after the last switch operat ion. To exitfrom the auto-power-off mode,set the Range Switchto OFF position once, and re-set it tothe Rangeat which a measurement to be conducted.7-5 Auxiliary Earth Resistance MeasurementThis instrument can measureand display the auxiliaryearth resistances(Rh, Rs). Whe n the Rh or Rs value is more than Reg ulated value or 50W , a warning message Rh>limitor Rs>limit The LCD shows Rh=OLW or Rs=OL when the Rh orRs values exceed 50k W .These parameters are measuredautomatically at auxiliary earthresistance measurements, and can be c heck ed o n the Resu lt Di spla y Scr een .Note) Rh and Rs stand for Auxiliary Earth Pole H(C)and the Auxiliary EarthResistance of S(P)respectively.7-6 Connection of Earth Test Leads and Simplified Measurement ProbesConnec t the Earth Test Leads and Simplified Measureme nt Probes to the connectors on theinstrument firmly. Otherwise, a contact failure occurs and wrong results may be read out on the LCD.Note) Some numbers other thanOLmay be displayed on the LCD when making measurement without

connecting any cord orprobe at 200W

  or upper Ranges. This is not a malfunctio n.

8 . MEASUREMENT METHOD8-1 Earth Resistance Measurement8-1-1 Precise Measurement (3-Wire) * with Earth Test LeadsThis is a standard method to measure earth resistances. The measured earth resistances are free ofauxiliary earth resistances butthe resistances on theE terminal are contained.Terminals to be used: E, S(P), H(C) TerminalsTest Leads: connect tothe E, S(P), H(C) Terminals Auxi liar y Ear th Sp ike : 2 pcs, c onn ect to th e S( P) and H( C) t ermi nal(1) Setting of Wiring SystemSelect Wire (4) with re ference to 8-2-2 Setting for Measu rement Method in this manual.(2) Setting of Rk 1. Firmly insert each plug of 3 test leads (green, yellow, red) to the corresponding connectors on theinstrument.2. Select the 2W or 20W Range3. Engage 3 Alligator clips to short-circuitall of them.4. Save the Rkvalues with reference to8-2-7 Setting for theresidual resistance (Rk) onthe TestLeads.Note) A break in Test Leads or burnout off fuse i suspected when the LCD shows Rk=OL

W

  while 3Test Leads are beingshorted.(3) Connection of Auxiliary Earth Spikes andTest LeadsStick the Auxiliary EarthSpikesS(P) and H(C) into the ground deeply. Theyshould be aligned ataninterval of 5-1 0m from the earthe d equipmen t under test. Connect the green Test Lead to the earthedequipment under test, theyellow Test Lead to the Auxiliary Earth SpikeS(P) and the red Test Lead to the Auxiliary Earth Spike H(C).The black Test Lead connected to theES Terminal should beconnected to the earthedequipmentunder test.(fig.14)

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Marks and Message

Battery voltage is low. Replace the batteries.

This mark is being displayed during a measurment.

Measuring range for the selected Range is exceeded.

 In case of Ust measurments, 50V or more is detedted.

Failed to make successful mesurements

Rk is exceeded the limit value;exceeding 2W W

 or lower.

Setting for Rk can be made at 20 W

Setting for Rk can be madeonly at 2w,3w,4w measurements.

Ust is Regulated value or more.

Rh and rs values exceed the allowable range.Correct results might not be obtained.

No saved data exists.

Memory is full. No more data can saved.

 A conf irma tio n mess age be fore d elet ing t he sele cte d.

 A conf irma tio n mess age be fore d elet ing al l sele cte d.

 All it ems ha ve bee n dele ted.

Nxxx is a memory no.,and the left message saying 95 data have been stored.(Displayed at the Data Review Screen.)

Indicating the measured result is saved with Memory NO. 003.

The character S stands for Site. Selectable from 000 to 999.

Data is successfully saved.

Details

OL

--

Rh>limit

RangelimitRs>limit

Saved

S005

No03

NO03/095

Data Succedd Delete

Delete All Item?

Delete This Item?

Memory Full

5. MARKS AND MESSAGE DISPLAYED ON THE LCD

6. MEASUREMENT PRINCIPLE6-1 Principle of Earth Resistance MeasurementsThis instrument makes erath resistance measurment with fall-of-potential method, which is amethod to obtain earth resistance value Rx by applying AC constant current I between themeasurment object E (earthelectrode) and H(C) (currentelectrode), and finding outthe potentialdifference V between E(earth electrode) and S(P)(potentialelectrode) See Fig.1.

 

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6-2 Principle of Earth Resistivity  Acco ring to t he Wenne r 4-p ole meth od, apply AC cu rren t I betwe en th e E (eart h el ectr ode) an d H(C )(current electrode) to findout the potential differenceV between the potentialelectrode S(P) andauxiliary earth electrodes ES.To Obtain the earth resistance W  wher e the int erva l betee wn el ectr odes is a(m) . Th en us e aformula:r =2 p aRg(mW )

7. PREPARATION FOR MEASUREMENT7-1 Battery Voltage Check Power on the instrument.If the display is clear without the Lowbattery mark "LOW-B" showing, batt ery vo ltag e is suff ici ent. Meas urem ents can not be made , e ven the Tes t Butt on is pres sed, whil e the Low Batt ery Mark is disp laye d on the LCD. Meas urem ents are haul t whe n the LowBattery Mark appears on the LCD.7-2 Test parameter setting7-2-1 Setting ItemsThis instrument starts with Measurement mode (Fig.3 Main Screen) when it is powered on whilethe Range Switch has been set to the position other thanOFF.

Measurement conditions should beset before starting measurements.Setting the date and timeenables a saving measured data with time information.Pressthe MENU Key andenter intotheSYSTEM_MENU.

Then select CONFIG_SETTING withCursor Keys, and pressthe ENTER/SAVE Key toenter intothe CONFIG_SETTING mode. (Fig.5)

 

Fig.2 

Fig.

Fig.4

7

Put the Right Cursor Key ®  to increase numbers and the Left Cursor Key ¬  to reduce numbers. Keepthe cursor Key presseddown to change numbersquickly. Press the ENTER/SAVEKey to confirm anumber.Repeat this procedure tochange the other digits.Pressing the ESC whensettings are done returntothe Time/Date Setting Screen.To change the date,proceed to Step (2). Press the ESC Keyagain to exit from the setting mode andreturn to the CONFIG-SETTINGScreen. Then the clockstarts.(2) Date SettingDate is displayed inthe following order: Month/Day/ Year.Put the cursor onDateandpress theENTER/SAVEKey to displaythe Date Setting Screen.Select a paramet er to be changed with the Cursor Key, and press the ENTER/SAVE Key. Then the

selected digit is highlighted and ready to be changed.Press the Right Cursor Key ® to increase numbers and the Left Cursor Key ¬   to reduce numbers.Keep the Cursor Key pressed down to change numbers quickly. Press the ENTER/SAVE Key toconfirm a number.Repeat this procedure to change the other digits. Pressing the ESC Keywhen settings are donereturns to the Time/DateSetting Screen.Press theESC Key again to exit from the setting mode and return to theCONFIG_SETTING Screen. Then theclock starts.Note) The sec ond is not displayed on the Main Screen; only hours and minutes are displayed .Note) The backup battery may be exhaust ed when clock beco mes wrong after powering on/off theinstrume nt. In this case, please contact our local distribut or. The life time of the backup battery isapprox 2 years.7-2-6 Setting for the residual resistance (Rk) on the Test LeadsThis instrument can store the residual resistance (Rk)of the Test Leadsbefore starting Remeasurements on 2/ 3/ 4-wire system, and can deduct the resistance from the measured result. Thesetting of Rk canbe done in followingprocedure.Select Rk with theCursor Key on the CONFIG_SETTING Screen, and pressthe ENTER/SAVE Keyto display the RkSetting Screen (Fig.12)

Press the Test Buttonto measure Rk. Themeasured results will notbe saved until theENTER/SAVEButton is pressed. TheCONFIG_SETTING Screen is displayedwhen the Button is pressed down andthe data is saved.

The Rk value is being kept even powering off the instrument. To clear the saved Rk values, selectClear on the Rk Setting Screen andpress the ENTER/SAVE Key. Then the value restores to 0.000WThen CONFIG_SETTING Screen isdisplayed again.Note) Rk values exceeding following values cannot be saved.

W

 Range: maxW ; W

 Range: max 9W ; A me ssa ge s hown in Fig. 13 i s dis playe d whe nth e me asur ed

Rk is exceeding above values.

 

Fig.12

Fig.13

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Pressing the ESC Keytwice exits from theCONFIG_SETTING mode and returnsto Measurement

mode.Settings of following parameterscan be made on this instrument Wire : Mea sure men t me thod Wiri ng Sy stem Freq : Mea sure men t fre quen cy Site: Site (location) NoLh: Interval of the auxiliary earth spikes at Earth resistivity (r ) measurementDate/Time: Year/ Month/ Day, Time (24-hour display Rk : Residual resistance on the Test Leads7-2-2 Setting for Measurement MethodMeasurement method is selectable from: 2-wire (2-wire system), 3-wire (3-wire system),4-wire(4-wire system) and (earth resistivity).SelectWirewith the Cursor Keyon the CONFIG_SETTING Screenand press the ENTER/SAVEKey toproceed to the WiringSetting Screen.Select the appropriate Wiring System with the Cursor Key and press the ENTER/SAVE Key. Then theCONFIG_SETTING Screen with theselected WiringSystem will be displayed .

7-2-3 Site (location) no.settingThe site (location) where measurements done can be saved with numbers. Select site with the CursorKey on the CONFIG_SETTING screen, and press the ENTER/SAVE key to display the site numbersetting screen.Select any digi t to be changed with the Cursor Key, and press the ENTER/SAVE Key . Then theselected digot is hightedand ready to be changed.(Fig.7)

Repeat this procedure tochange the other didits.Press the ESC keywhen settings are done.Then the CONFIG-SETTING Screen(Fig.8) with the selected site No. will be displayed.Note) Site No. is selectable from 000 to 999.

 

Fig.6

Fig.7

8

 

Fig.8

 

Fig.9

 

Fig.11

7-2-4 Setting for the interval between Auxillary Earth Spikes at Earth Resistivitr

)Making setting of the intervals between auxiliary earth spikes is necessary to measure earthresistivitySelect Lh with theCursor Key on theCONFIG-SETTING Screen, and pressthe ENTER/SAVE key todosplay the length SettingScreen.Select any digits to be changed with the Cursor Key, and press the ENTER/SAVE Key. Then theselected difits is highlighted and reasy to be changed.

Press the Right Cursor Key ®   to increase numbers and the Left Cursor Key ¬   to reduce numbers.

Keep the Cursor Key pressed down to change numbers quickly. Press the ENTER/SAVE Key toconfirm a number.Repeat this proce dure to change the other digits. Pres s the ESC Key when settings are done. Then theCONFIG-SETTING Screen with a new interval will be displayed.Note) Intervals van be set within a range of 1.0 to 30.0m. If a longer interval out of this range isentered at the SettingScreen, it automatically changedto 30.0m when pressingthe ENTER/SAVEkey.Note) Intervals up to 30m can be selected with the supplied Test Leads.7-2-5 Date and Time SettingThis instrument has aclock function and cansave the mesaured datawith time and dateinformation.The clock will notbe reset once it has been set evenafter powering off the instrument. A manualadjustment is required to keep the clock time always right.Time setting can bedone in following procedure.Select Date/Time with theCursor Key on theCONFIG-SETTING Screen, and pressthe ENTER/SAVEKey to display theTime and Date Setting Screen.

(1) Time SettingPut thecursor in Time and press the ENTER/SAVE Key, and display the time Settin g Screen. Select aparameter to be changed with the Cursor Key, and press the ENTER/SAVE Key. Then the selecteddigit is highlighted andready to be changed. (Fig.21) The clock is 24-hour display.

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