アースハイテスタ 3143 EARTH HiTESTER 3143〔2.2 MB〕
Contents
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3. 3 This warranty is valid only in Japan Em FAA 386 1192 81 TEL 0268 28 0555 FAX 0268 28 0559 3143 EARTH HiTESTER INSTRUCTION MANUAL Contents Introduction i IRS peo i Safety Notes i Notes on Use ets vi Chapter 1 Outline 1 1 1 Product Outline sessist 1 1 2 Features seen 2 1 3 Names and Functions of Parts 4 Chapter 2 Specifications 7 Chapter Measurement Procedure 11 3 1 Measurement Preliminaries 12 3 2 Measuring method Tv 13 Chapter 4 Technical Information 19 4 1 About Ground Resistance Y 19 4 2 Principle of Conventional Measurement of Ground Resistance Fall of Potential Method 21 4 3 Principle of Measurement on Which This Instrument is Based 22 4 4 Comparison of Values Measured by Conventional Ground Resistance Meters Fall of Potential Method and Model 3143 24 4 5 Sample Measurement Measurement of Ground Resistance for Overhead Telecommunications Equipment and Various Types of Protectors m 26 Chapter 5 Precautions concerning Measurement 29 Chapter 6 Maintenance and Service 31 6 1 9338 CARRYING CAS
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7. Instruction Manual 3143 EARTH HiTESTER Ee 5100141 HIOKI E E CORPORATION 2013 4 6 April 2013 Revised edition 6 3143A980 06 13 04H OE 600219586 eed 1 1 00000 2 HHHHHHHHHHH c 5 1 9 14 0000 9 TL 10 13 H 11 020 D 0 k 13 HHHH 17 31 00000 em etenee 18 32 0000 18 040 8 23 41 00000 000 0 e 23 42 0000000000000000000 25 43 HHHHHHH 26 44 HHHHHHHHHHHHHHHH 3 80000000 27 45 HHHHHHHHHHH 0000000000000 09 29 Hs EE EEE sees 31 060 000000 0 33 6 1 933800000 62 34 63 HHHHHHHHH 35 64 HHHH 35 0 0 0000 D B gt 10 p 20 0 0 0 0 0 0 D LRGD 9216 0 0 D 0 9265 0 00000 10 m See pH Serena s 3 99 Se eee om 1 1 142 151 191 1 1 1 Ere Aes
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11. Chapter 1 Outline Power switch POWER Instrument power switch Measuring knob MEASURE Knob for measuring ground resistances Turn the knob until the instrument indicates a minimum resistance value Earth Earthing electrode terminal Terminal to which the earthing electrode is connected via the lead line black Return Return terminal Terminal to which the return line red is connected Position the return cable directly on the ground 5 LCD display 6 Measured ground resistance value 7 Measurement indicator bar Indicates the direction in which the measuring knob MEASURE is to be turned Turn the knob to shrink the indicator bar Hold indication Following measurement the display retains the value of the last value measured If the measuring knob MEASURE is left untouched for about 3 minutes the instrument will enter Hold status Turning the knob cancels Hold status and resumes measurement Chapter 1 Outline 9 Battery check Indicates that the batteries have been exhausted Replace the batteries 10 Battery cover 11 Fixing screw on the battery cover Chapter 1 Outline N Chapter 2 Specifications lt Measurement gt Measurement Voltage ratio method measures the method voltage under the series resonance of a loop impedance Note When measured with the lead line connected to the earthing electrode being measured and the return line p
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14. 0 0 oo Earth Return OO 0 8 00000 040 0 0 27 R R R R R outs Rg out Rg Ro R 000000 0000 mgHHHHHHHH Dan 0000 0000 1 Vc Vm 1 Roul Rg 0000000 000 1 MHz 44 HHHHHHHHHHHHHHHH 31430000000 3 000 000 000 100 2096rdg 0 00 0 pol 5 0 0 0000300000 3143 100 30000 HHHHHHH 1 1 1 040 0 0 28 500 100 50 10 30000000090 ue 30000 31430000000 40 T T T T T TT TT T T T T 30 o 0 20 10 RN 20 ME AN oL S 8 8 7 evo Ao 2 z Ed a 2 2 ud S 0880 UNIES 9 9 5 20 55 30 o 40 1 r s L pp 10 50 100 500 30000000090 010 30000000 31430 rdg 0 040 0 0 Ez EST ET EISE EI
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20. 1 Rg R Cg Figure 8 Diagram of Measurement Principle zRout Hg As shown above R represents the sum of ground resistance Hg and Rout If the voltage Vm between the measurement terminals is measured ground resistance Rg may be calculated by the voltage ratio method Hou Vc Vm 1 Chapter 4 Technical Information 24 In passing the resonance frequency will be high around 1 MHz although it will vary somewhat with varying geological features water content and degree of soil compaction Since this frequency band corresponds to the duration of the wave front of a lightning surge measurements of ground resistances using this instrument may be regarded as similar to the evaluation of surge impedances 4 4 Comparison of Values Measured by Conventional Ground Resistance Meters Fall of Potential Method and Model 3143 Figure 9 represents the correlation between the measurement of ground resistances of bar type electrodes by the fall of potential method 3 pole method and a measurement conducted with the 3143 while Figure 10 indicates rdg errors of the 3143 with respect to the values of the 3 pole method defined as true values In the figure it is apparent that values obtained by the 3143 match those of the 3 pole method in the range from 10 to 20 rdg when ground resistances range from 50 to 500 Moreover the rdg error
21. 0 0000 20 0 D 0000 D 1550 980 x 490 mm 00000000 00 0 00000 000000 0000 EN 61010 000 2 330v EMC OQ EN61326 0000000000 300000000 0000 LCDHH 0000000000000000000 HHHHHH 0000000000000000000 0000000000000000000 0000000000 HHHHHHHH 44 0000000000 00000 9216 0 0 9265 0 D 00000 9338 0 0 0000 0 300 020 0 H 16 020 0 H 17 lt 030 0000 H A 3 EE LE rasa y e sas E3EIEYEI E E3 E3 p E ES E EZ EE pap p pu pp 5 030 0000 a E 3 00000000000 03 000 030 0000
22. 9000 1 50000 000000 000000 00000000000 200000 0 010 13 020 0000 0000 00000000000000000200 000000000000000 00000000000000000000 0000000000000000000 0 000000000000000000 00000 000000 200 500 Q 0000 50 rdg 500 5000 HHHHHHHHHH 100 rdg 200 500 HHHHHHHHHHHHHHHHH HHHHHHHHHHHHHHHH 100 000000 0010000 50 rds 50 60Hz 0000 000000 0000 1000000000 200000 HHHHHLPFHHHHHHHHH 00000000 96 0 5 000000000 020 0 0 00000 HHHHHHHHHHHHHHHHHHH HHHHHHH 00000000 00000 100 kHz 1 5 MHz HHHHHHHHHHHHHH 00000000 240 Hz 0000000 AC 0 9 Vp typ 000000 2000 I D 000000000 AC3 6 mA max 0000 0000 40 1 0 00 999 9 ODD DD B 999 9 0 100kHzHHHHH 15 000000000000 0000 0000000000000000000 Oooo 00 0000 000000 OH 40 80 000000 100 0 8OHrhHHHHHHHHHH OOOO 2000 00 OOOO 0000 0 30000 0000 400 00000 1 5 4 000000 1 5 OOOO 0000000 8000 23 1 1
23. For this reason the distance between electrodes C and E must be made sufficiently large Additionally measurement errors will be produced if electrode P is not driven into a point 61 8 between electrodes E and C Chapter 4 Technical Information 22 zi S Resistance range Resistance range of electrode of electrode Driving in auxiliary electrodes is difficult at sites where the ground is paved with concrete or asphalt resulting in reduced work efficiency Im b Measurement Horizontal value i C Earth surface ANE Rc 4 3 Principle of Measurement on Which This Instrument is Based When the earthing electrode is connected to the ground terminal of this instrument through the lead line and the return line connected to the Return terminal is laid on the ground a closed circuit is composed of inductance Lg of the lead wire gt ground resistance Hg ground ground resistance H of return line and the earth and electrostatic capacity Cg This instrument measures the loop impedance under the resonance of this closed circuit and calculates ground resistance Rg Figure 8 shows an equivalent model Equivalent resistance R at the time of resonance as viewed from measurement signaling line VC results as follows Rout is the output resistance of this instrument Chapter 4 Technical Information 23 22 Grounded body Ground being measured 9149 2 Rout
24. Ground Return terminals is interrupted Turning the knob in this status cancels Hold and resumes measurement HOLD displayed Figure 5 Hold State 4 Battery check See if the battery check mark is on If yes the batteries have run down and need to be replaced See 6 2 Replacing the Batteries C j d Check Figure 6 Battery Check Chapter 3 Measurement Procedure 18 Chapter 3 Measurement Procedure MEN Chapter 4 Technical Information This chapter explains the definition of generic ground resistance types of grounding implementations principles of measurement of typical ground resistances and describes grounding methods implementations and resistance measurements for overhead telecommunications equipment and protectors as exemplified in typical measurement situations 4 1 About Ground Resistance 1 What is ground resistance Ground resistance refers to electrical resistance between a metal earthing electrode and soil a mixture of soil particles water and air and is specified in many legal codes and standards as part of the safety criteria to be observed in the construction of electrical installations In general ground resistance is defined as the ratio of the current I A flowing from a earthing electrode to the ground to the rise of the potential E V generated by such a current Chapter 4 T
25. under the supervision of qualified technicians knowledgeable about the dangers involved The 4 indicator appears when battery voltage becomes low Replace the batteries as soon as possible To clean the instrument wipe it gently with a soft cloth moistened with water or mild detergent Never use solvents such as benzene alcohol acetone ether ketones thinners or gasoline as they can deform and discolor the case After use there is still a drain on the battery be sure to turn the power switch off Notes on Use Notes Use Chapter 1 Outline 1 1 Product Outline In contrast to conventional 3 pole type ground resistance meters this instrument allows easy measurement of ground resistances with no need to drive auxiliary earthing electrodes into the ground whether soil or asphalt This is particularly useful when ground resistances need to be measured in urban environments in which driving auxiliary earthing electrodes into the ground is not easy or practical The instrument is best suited to the measurement of ground resistances for grounding connections that use individual bar type earthing electrodes for telecommunications equipment installed on poles overhead telecommunications equipment and for telecommunications equipment protectors Model 3143 was designed and commercially produced using technology originally devised by the Technical Cooperation Center of NTT East Chapter 1 O
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27. CD display Display range from 0 0 to 999 9 Q OF displayed for resistances over 999 9 Q OL displayed when an attempt is made to vary down to below 100 kHz or up to over 1 5 MHz with the measuring knob Types of indications Measured resistance value Q indicator bar graph provides a rough guide to the position of the resonance point battery mark and HOLD mark Chapter 2 Specifications Environment Operating temperature and humidity range 0 to 40 C 32 F to 104 8096 RH or less with no condensation Storage temperature and humidity range 10 to 50 14 to 122 8096 RH or less with no condensation Location of use Altitude up to 2000 m 6562 feet Power supply Power supply Four LR6 alkaline batteries Rated supply voltage 1 5 V x 4 Maximum rated power 1 5 VA max Battery Life Approx 8 hours continuous 23 C Over view External dimensions Approx 155 W x 98 H x 49 D mm Approx 6 10 W x 3 86 H x 1 93 D excluding protrusion Mass Approx 380 g Approx 13 4 oz instrument only Standards applying Safety EN 61010 Pollution Degree 2 anticipated transient overvoltage 330 V EMC EN 61326 Ancillary functions Chapter 2 Specifications 10 Power Saving mode The instrument enters Power Saving mode if the measuring knob is left untouched for about 3 minutes Ou
28. E 31 6 2 Replacing the Batteries 32 6 3 Cleaning the Product s 34 6 4 Service YW 34 Introduction Thank you for purchasing the HIOKI 3143 EARTH HiTESTER To obtain maximum performance from the instrument please read this manual first and keep it handy for future reference Inspection When you receive the instrument inspect it carefully to ensure that no damage occurred during shipping In particular check the accessories panel knob and connectors If damage is evident or if it fails to operate according to the specifications contact your dealer or Hioki representative Accessories 9216 CABLE WINDER with 9265 9265 MEASUREMENT CABLE Lead line Black 1 m Return line Red 20 m 9338 CARRYING CASE Instruction Manual LR6 alkaline batteries four Introduction Safety Notes This instrument is designed to comply with IEC 61010 Safety Standards and has been thoroughly tested for safety prior to shipment However mishandling during use could result in injury or death as well as damage to the instrument Using the instrument in a way not described in this manual may negate the provided safety features Be certain that you understand the instructions and precautions in the manual before use We disclaim any responsibility for accidents or injuries not resulting directly from instrument defects Safety symbols This manual contains information and wa
29. criber line protector protector rn es Overhead Z telecommunications equipment closure etc rounding Grounding electrode Figure 12 Environment Surrounding Overhead Telecommunications Equipment and Protector Grounding electrode Figure 13 Example of 3143 Use Chapter 4 Technical Information 29 Chapter 5 Precautions concerning Measurement This instrument measures ground resistances based on new measurement principle For this reason depending on the grounded body the values obtained with it may vary from those measured by the traditional 3 pole method Carefully read the following precautionary notes before using this instrument 1 The 3143 is suitable for measuring the ground resistances of independent bar type electrodes Measurement results obtained by the conventional 3 pole method may appear somewhat larger in comparison when the measurement is performed at the following locations Grounding connections implemented by the parallel grounding method with a concatenation of multiple earthing electrodes or net type electrodes such as a mesh Grounding connections implemented by a deep driven grounding method that buries earthing electrodes deep in the ground Chapter 5 Precautions concerning Measurement 30 For resistance measurements with safety implications especially grounding connectors for power facilities double check resistance values
30. echnical Information 20 2 Leakage current and ground voltage In ordinary ground resistance measurements external influences include leakage current from connected equipment and ground voltage created by ground current Since the return line of the instrument is laid on the ground in an electrically insulated state the instrument is relatively resistant to the adverse effects of leakage currents and ground voltages generated by higher harmonics up to kHz so generated by commercial power Chapter 4 Technical Information 21 4 2 Principle of Conventional Measurement of Ground Resistance Fall of Potential Method Most ground resistance meters perform measurements based on the fall of potential method These types of meters are widely used in the measurement of the low resistance to the high resistance This method requires driving into the earth an auxiliary current electrode electrode C to inject measuring current and an auxiliary potential electrode electrode P to measure the rise of potential in addition to the grounding electrode electrode E From grounding current A and the corresponding fall of potential V V ground resistance value Hg is given by the following equation Figure 7 shows a potential distribution curve obtained when auxiliary electrodes are driven into the ground Electrode P must be driven into the ground at the point in the figure at which the potential distribution curve is flat
31. establishes safety standards for various electrical environments categorized as CAT II to CAT IV and called measurement categories CAT II Primary electrical circuits in equipment connected to an AC electrical outlet by a power cord portable tools household appliances etc CAT Il covers directly measuring electrical outlet receptacles CAT III Primary electrical circuits of heavy equipment fixed installations connected directly to the distribution panel and feeders between the distribution panel and outlets CAT IV The circuit from the service drop to the service entrance then to the power meter and to the primary overcurrent protection device Safety Notes Using a measurement instrument in an environment designated with a higher numbered category than that for which the instrument is rated could result in a severe accident and must be carefully avoided Use of a measurement instrument that is not CAT rated in CAT II to CAT IV measurement applications could result in a severe accident and must be carefully avoided Distribution Panel Service Entrance Outlet Power Meter 7 Fixed Installation Safety Notes vi N Notes on Use Follow these precautions to ensure safe operation and to obtain the full benefits of the various functions Preliminary Checks Before using the instrument the first time verify that it operates normally to ensure that the no damage occurred during stora
32. ge or shipping If you find any damage contact your dealer or Hioki representative Before using the instrument make sure that the insulation on the measurement cables is undamaged and that no bare conductors are improperly exposed Using the product in such conditions could cause an electric shock so contact your dealer or Hioki representative for replacements Model 9265 Notes on Use vii E The ground and return measurement terminals of this instrument are designed to measure ground resistance Accidental connection of the terminals to a commercial power source or potential bearing object may result in electric shock Exercise extreme care Do not allow the instrument to get wet and do not take measurements with wet hands This may cause an electric shock To avoid electric shock do not connect or disconnect measurement cables while the instrument is wet Do not use the instrument where it may be exposed to corrosive or combustible gases The instrument may be damaged or cause an explosion Do not mix old and new batteries or different types of batteries Also be careful to observe battery polarity during installation Otherwise poor performance or damage from battery leakage could result Notes on Use To avoid electric shock turn the power switch off and disconnect the measurement cables before replacing the batteries To avoid the possibility of explosion do not
33. ity of explosion do not short circuit disassemble or incinerate batteries Handle and dispose of batteries in accordance with local regulations Use only the specified battery type AA alkaline Manganese batteries for example will provide insufficient service life To avoid corrosion from battery leakage remove the batteries from the instrument if it is to be stored for a long time Chapter 6 Maintenance and Service 33 Figure 15 For safety disconnect the measurement cables from the instrument Remove the fastening screw Remove the cover of the battery compartment in direction A as shown in the illustration Replace all four batteries with fresh ones 5 Reattach the cover of the battery compartment in direction B as shown in the illustration Fasten the battery compartment cover to the instrument with the fastening screw Chapter 6 Maintenance and Service 6 3 Cleaning the Product To clean the instrument wipe it gently with a soft cloth moistened with water or mild detergent Never use solvents such as benzene alcohol acetone ether ketones thinners or gasoline as they can deform and discolor the case 6 4 Service If the instrument seems to be malfunctioning confirm that the batteries are not discharged and that the measurement cable is not open circuited before contacting your dealer or Hioki representative Pack the instrument so
34. laced directly on the ground the resistance value sought is the one that appears as the minimum value in the display as the measuring knob is turned Note Loop impedance refers to a series circuit composed of the inductance of the lead line the grounding capacity of the return line and the measured ground resistance Measured resistance range 20 500 Q Measurement accuracy in the operating temperature range 5 rdg 50 500 Q 10 rdg 20 50 Q Note With the inspection jig based on a dummy resistance Accuracy is not guaranteed when the indicator is on Effect of ground voltage 50 60 Hz 5 rdg at 0 10 V Detection system Synchronous detection system Chapter 2 Specifications A D conversion 10 bit successive approximation type A D converter Synchronous detection LPF output sampled Sampling interval 96 ms S Correction method for measured values Averaging Sampled values are subjected to processing averaging and the resulting value is indicated as a measured value Signaling source for measurement Frequency range 100 kHz 1 5 MHz Adjustable using the measuring knob on the front panel Frequency variation 240 Hz resolution Output voltage 0 9 Vp AC typical between terminals Output resistance 200 Q 1 between terminals The short circuit current between terminals is 3 6 mA AC max lt Display gt Indication method 4 digit L
35. lue slowly turn the knob to find the minimum value Figure 4 b Figure 4 c 3 When you stop turning the knob the measured value appearing in the display will stabilize Figure 4 c Chapter 3 Measurement Procedure 16 OF Q ni LIL Q The measurement indicator bar displayed may not stabilize depending on the resistance value of the grounded body being measured or the environment in which the return line is laid Particularly for measurements of large ground resistances no minimum value may be shown even when the indicator bar is located in the center of the display If so turn the knob to minimize the indication value If the measured resistance value is 1000 or more the LCD will display OF Turn the knob using the orientation of the indicator bar as a guide and seek the point for a minimum measured value If you keep turning the knob in a given direction until the LCD displays OL turning the knob further will not vary the measured value Try turning the knob in the opposite direction and seek the minimum measured value Chapter 3 Measurement Procedure 3 Hold status The instrument will enter Hold status if the measuring knob MEASURE is left untouched for about 3 minutes HOLD is displayed see Figure 5 with the value measured immediately before the Hold state retained on the display In addition the signal from the measurement terminals between the
36. ough various types of networks Such equipment handles high speed and high volume telecommunications traffic and must also have adequate resistance and strength to protect both people and equipment from lightning and leaks Thus grounding implementations involving overhead telecommunications equipment and protectors are more important now than ever before In particular protectors discharge lightning surges passing from communication lines to the ground Provided below are potential environments surrounding overhead telecommunications equipment and various types of protectors Chapter 4 Technical Information 27 1 It is necessary to confirm that the ground resistance value obtained following grounding implementation is lower than the value specified in a standard for safety of each country 2 Many of the work sites are in residential and office building areas which means that most of the ground surface is asphalted making it time and labor consuming to drive in auxiliary earthing electrodes using the conventional 3 pole method Under these conditions this instrument provides the following advantages 1 No need to drive in auxiliary earthing electrodes saving time and labor 2 The digital display of measured values allows immediate assessment to determine whether or not the ground resistance is lower than the value specified in a standard for safety Chapter 4 Technical Information 28 Communications Subs
37. r 3 Measurement Procedure Do not mix old and new batteries or different types of batteries Also be careful to observe battery polarity during installation Otherwise poor performance or damage from battery leakage could result NCAUTION Use only the specified battery type AA alkaline Manganese batteries for example will provide insufficient service life To avoid corrosion from battery leakage remove the batteries from the instrument if it is to be stored for a long time 31 Measurement Preliminaries 1 Turn on the POWER switch and make sure that the LCD display lights OF is displayed if nothing is connected to the measurement terminals 2 Check to see if the battery check mark is on If this mark stays it indicates that the batteries have run down Replace them with new ones See 6 2 Replacing the Batteries Chapter 3 Measurement Procedure 3 2 Measuring method 1 Connecting the cables Connect the measurement cables 9265 supplied with the instrument as shown in Figure 3 Couple the lead line black to the ground terminal and the return line red to the Return terminal Connect the other end of the lead line to the buried earthing electrode and lay the return line on the ground on paved concrete or asphalt Lead line Black 1 m Return line Red 20 m H Figure 3 Connection Diagram Chapter 3 Measurement Procedure 14 Use only the mea
38. rnings essential for safe operation of the instrument and for maintaining it in safe operating condition Before using it be sure to carefully read the following safety precautions The A symbol printed on the instrument indicates that the user should refer to a corresponding topic in the manual marked with the symbol before using the relevant function n the manual the A symbol indicates particularly important information that the user should read before using the instrument Indicates DC Direct Current Safety Notes iii The following symbols in this manual indicate the relative importance of cautions and warnings Indicates that incorrect operation presents an extreme hazard that could result in serious injury or death to the user Indicates that incorrect operation presents a significant hazard that could result in serious injury or death to the user Indicates that incorrect operation A CAUTION presents a possibility of injury to the user or damage to the instrument Indicates advisory items related to performance or correct operation of the instrument We define measurement tolerances in terms of rdg reading values with the following meanings rdg reading or displayed value The value currently being measured and indicated on the measuring instrument Safety Notes iv Measurement categories To ensure safe operation of measurement instrument IEC 61010
39. s tend to increase in the range from 20 to 50 At this point it should be noted that Figures 9 and 10 include measurement errors resistances of auxiliary earthing electrodes effects of ground voltage etc of the 3 pole method Use this data for reference only Chapter 4 Technical Information Measured Value of 3143 ohm Rdg Error of 3143 96 500 50r 10 Lol 4 1 11 1 1 10 50 100 500 Measured Value 3 Electrode Method ohm Figure 9 Correlation between Values Measured by 3 Electrode Method and with the 3143 40 T 30F 28 DS duc O 9 5 0 S 78 RUM o 0 10 p 2 0880 20 30 4 40 k 1 10 0 100 500 Measured Value of 3 Method ohm Figure 10 Errors of 3143 with Respect to 3 Electrode Method Chapter 4 Technical Information 26 4 5 Sample Measurement Measurement of Ground Resistance for Overhead Telecommunications Equipment and Various Types of Protectors It is increasingly common to find some switching and transmission equipment functions formerly located within telecommunications center buildings on or near the premises of residences This configuration makes it possible to provide diverse information services thr
40. short circuit disassemble or incinerate batteries Handle and dispose of batteries in accordance with local regulations NCAUTION Do not store or use the instrument where it could be exposed to direct sunlight high temperature or humidity or condensation Under such conditions the instrument may be damaged and insulation may deteriorate so that it no longer meets specifications For safety reasons when taking measurements only use the 9265 MEASUREMENT CABLE provided with the instrument To avoid breaking the measurement cables do not bend or pull them Use only the specified battery type LR6 alkaline battery Manganese batteries for example will provide insufficient service life Notes on Use NCAUTION To avoid corrosion from battery leakage remove the batteries from the instrument if it is to be stored for a long time To avoid damage to the instrument protect it from physical shock when transporting and handling Be especially careful to avoid physical shock from dropping Although this instrument is designed to resist the semi ingress of dust and water it is not entirely water or dust proof so to avoid shock or damage do not use it in a wet or dusty environment f the protective functions of the instrument are damaged either remove it from service or mark it clearly so that others do not use it inadvertently Calibration and repair of this instrument should be performed only
41. surement cables supplied with the instrument Use of any other cable will result in inaccurate measurements Lay the return line directly on the ground in a straight line confirming that the cable remains in contact with the ground Correct measurements are not possible if the cable is tangled or forms loops Particularly with turf or rock beds try to place the return line in close contact with the ground to the maximum extent possible Connect the lead line directly to the earthing electrode being measured If for unavoidable reasons the lead line must be tied to the ground wire extending from the earthing electrode limit total length to 5 meters Connect the lead line at a point as close as possible to the point at which the earthing electrode was buried Chapter 3 Measurement Procedure 2 Measurement of ground resistance value Turn the measuring knob MEASURE to find the lowest indicated value The lowest value represents the resistance value of the earthing electrode being sought Turn the measuring knob as follows 1 The measurement indicator bar shows the direction in which the Lam knob should be turned 3 If the indicator bar appears as shown in Figure 4 a turn the knob counterclockwise to bring the indicator bar to the V position See Figure 4 If the indicator bar appears as shown in Figure 4 b turn the WeAsume knob clockwise 2 Closely observing the measured va
42. that it will not sustain damage during shipping and include a description of existing damage We cannot accept responsibility for damage incurred during shipping Chapter 6 Maintenance and Service URL http www hioki com e e e TEL 0268 28 0555 FAX 0268 28 0559 T386 1192 81 5 0120 72 0560 9 00 12 00 13 00 17 00 TEL 0268 28 0560 FAX 0268 28 0569 E mail info hioki coJp
43. tput of the measurement signaling source is halted The LCD displays HOLD Turn the measuring knob to wake the instrument from Power Saving mode Indicator Indicates an approximate position of the resonance point of the loop impedance on a bar graph When the bar graph is situated near the center of the display it indicates that the loop impedance is near the resonance point Battery check The battery check indication appears when the battery voltage falls below the rated supply voltage of 4 4 V Accessories 9216 CABLE WINDER with 9265 9265 MEASUREMENT CABLE Lead line Black 1 m Return line Red 20 m 9338 CARRYING CASE Instruction Manual LR6 alkaline batteries four Chapter 2 Specifications 11 Chapter 3 Measurement Procedure NDANGER The ground and return measurement terminals of this instrument are designed to measure ground resistance Accidental connection of the terminals to a commercial power source or potential bearing object may result in electric shock Exercise extreme care es Do not allow the instrument to get wet and do not take measurements with wet hands This may cause an electric shock To avoid electric shock do not connect or disconnect measurement cables while the instrument is wet Do not use the instrument where it may be exposed to corrosive or combustible gases The instrument may be damaged or cause an explosion Chapte
44. using the 3 pole method 2 Use only the measurement cables 9265 MEASUREMENT CABLE supplied with the instrument Use of other cables may result in measurement errors 3 Lay the return line directly on the ground ensuring contact with the ground Correct measurement results are not possible if the return line loops or folds back on itself Close contact with the ground surface is particularly important on turf or rock bed surfaces 4 Connect the lead line at a point as close as possible to the point at which the earthing electrode is buried Chapter 5 Precautions concerning Measurement 31 Chapter 6 Maintenance and Service 6 1 9338 CARRYING CASE The 9338 CARRYING CASE is designed exclusively for this instrument and is capable of accommodating 9265 MEASUREMENT CABLE and four AA batteries in addition to the instrument itself With the upper cover rotated as shown in Figure 14 measurements can be made without removing the instrument from the case To avoid damage from external shocks always place the instrument in its carrying case at the end of each measurement session Figure 14 Chapter 6 Maintenance and Service 32 N 6 2 Replacing the Batteries To avoid electric shock turn the power switch off and disconnect the measurement cables before replacing the batteries After replacing the batteries replace the cover and screws before using the instrument To avoid the possibil
45. utline Return Cable Measurement Cable Grounded body being Ground measured Bar type earthing electrode Figure 1 1 2 Features 1 No need to drive auxiliary earthing electrodes into the ground Allows easy measurement of ground resistances simply by connecting the earthing electrode to the measurement terminals Ground side of the instrument and the return line red line to the other terminal Return side and placing the return line on the ground 2 Ideally suited to measurements of bar type earthing electrodes The instrument allows easy measurement of the ground resistances of individual bar type earthing electrodes for overhead telecommunications equipment protectors Chapter 1 Outline 3 Reduces the effects of ground voltage The instrument uses a synchronous detection system with the return line placed directly on the ground in an electrically insulated state This reduces the adverse effects of higher harmonic ground voltages of commercial frequency to ensure stable measurement 4 Semi dust proof construction Measurement switches indicators and other moving parts are designed to withstand use in tough environments 5b Easy to use The supplied carrying case is designed to hold the instrument and all accessories A cable winder is standard making it easy to deploy and store measurement cables Chapter 1 Outline 1 3 Names and Functions of Parts
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