Instruction Manual
Contents
1. OL is displayed when the measured value exceeds the upper limit of the measuring range at each insulation resistance range Range Upper limit 250V 105 0MQO 500V 1050MQ 1000V 2 10GQ 2500V 105 006 0 5000V 1200GQ I 4 Display examples of DAR PI values The DAR PI values are displayed as follows during a measurement 1 Start of test im w M w amn We K AS mn Ca 1 itv No DAR PI value is displayed 2 1 min after the start of test RR a m i K AS 180 l 0 m DAR value is displayed g D y 3 10 min after the start of test w M R a F R WITH qa a yA AS ITH PI value is displayed Press the DISP button to switch DAR and PI values 5 How to review the measured DAR PI values Press the DISP button after a measurement The measured results are then displayed in the following sequence If a measurement ends earlier than the intervals described in below 2 3 or 4 nothing will be displayed and returns to the initial state 1 T 1 End of test m wt amp SN Zo K LLL Pa A 438 e Ep c pus 3 Results at 1 min after a start of test A Sig 109 A eo Time when a test ends Value measured at the end of test resistance value DAR or PI val2. ODNDARWN 10 4 2 LCD display 3 2 4 NO im stre WUT 97 Soy Ne A 11 1 A B gai Liv Ww ML eee OOc GT T pA D D Be a 4 BBD 9888 6888 FEBE e 6 E 8 Insulation resistance Bar graph Voltage monitor Battery mark Voltage warning mark Timer display DAR mark PI mark DAR PI value 10 DC 11 AC 12 Minus display 13 Unit O O O ELM lt i 4 3 How to remove the Hard case Hold the side surface of the terminal part and gently pull the unit toward the front Hold the side surface of the terminal part nin AU fo 5 Getting started 5 1 Checking the battery voltage 1 Set the Range switch to any position other than OFF 2 When the Battery mark shown at the upper left on the LCD is last one level E_ the batteries are almost exhausted Replace the batteries with new ones to perform further measurements The instrument operates properly even if under such a low battery level and it may not affect on the accuracy When the empty Battery mark _ appears the battery voltage is below the lower limit of the operating voltage So the accuracy cannot be guaranteed Please refer to clause 7 Battery Replacement for the battery replacement procedures 5 2 Connecting test leads Insert the test lead firmly to the connector terminal on the instrument Connect the Line Probe red to the Line terminal the Earth Co
3. at short circuit 200mA 31254 350mA_ 400mA 500mA 750mA 900mA When rated 0 25MQ 0 5MQ 1MQ 2 5MQ 5MQ current is outputted 3925 250mA 300mA 350mA 500mA 110mA 0 25MQ 0 5MQ 1MQ 2 5MQ Output at open circuit 40mA 40mA 50mA 80mA 150mA Stand by 25mA Backlight on Increased by 40mA Measurement time Accessories 3125A approx for 25hours under a load of 100MQ on the Insulation resistance 5000V range 3025A approx for 80hours under a load of 100MQ on the Insulation resistance 2500V range Line probe MODEL 7165A Including MODEL8255 Straight type prod with molded parts Earth cord MODEL 7264 Guard cord MODEL 7265 LR14 Alkaline battery size C x 8pcs Instruction manual Hard Case MODEL 9179 Pickel Type Prod MODEL 8019 Straight Type Prod MODEL 8254 Optional accessories Adaptor for recorder MODEL8302 Line probe with alligator clip MODEL7168A Long Line probe with alligator clip 15m MODEL7253 9 4 Instrument layout 4 1 Instrument layout PER L LC OUT sm INN K Te Ow ABBED XX N KhkyorTsu 4 nen 5 HIGH VOLTAGE INSULATION TESTER LCD display Range Switch Test button Back Light button DISP button Line Terminal Earth Terminal Guard Terminal Line Probe red 10 Earth Cord black 11 Guard Cord green
4. 050MQ 0 0M 2 10GQ 0 0M 105 0G0 Open circuit DC 250V DC 500V DC 1000V DC 2500V Voltage 10 10 20 10 20 0 20 0 1mA or more 1mA or more iz t 1 2mA or less 1 2mA or less Mren at 1MQ load at 2 5MQ load Short circuit Current 1 5mA 0 5mA Accuracy 5 rdg 3dgt 6 KEW3125A has an additional range Rated 5000V voltage 0 0 99 9MQ 80 1000GQ Measuring 80 999MQ Range 1 0 80 9 99GQ 8 0 99 9GQ Display 0 0M 1200GQ range Open circuit DC 5000V Voltage 1mA or more G 1 2mA or less at 5MQ load Short circuit 1 5mA 0 5mA Current Accuracy 5 rdg 3dgt 20 Voltage monitor for insulation resistance range KEW3125A 30 6000V resolution 10V 10 rdg 20V KEW3025A 30 3000V resolution 10V 10 rdg 20V This monitor is used to check whether electric charges stored on the equipment under test are discharged or not The voltage value measured and displayed on the LCD is a reference value Please note that the indicated value when an external AC voltage is applied to the instrument is not a correct value Voltage measurement range DC voltage AC voltage Measuring range 30 600V 30 600V 50 60Hz Resolution 1V Accuracy 2 rdg 3dgt 7 Display Low battery warning Overrange indication Auto ranging Auto power off Altitude Liquid crystal display Insulation resistance range Max 1200 co
5. Instruction manual 00M 1G 106 WII U nx BEBO GQ s VMU Pai KYORITSU HIGH VOLTAGE INSULATION TESTER KEW 3125A High voltage insulation resistance tester KEW3125A 3025A KYORITSU ELECTRICAL INSTRUMENTS WORKS LTD B Contents 1 Safety Warnings sort ttt tenet eee ee 1 PA Features Cierp etia KER ERKE ERRER aa a a RRR RRR a a 5 3 Specification sepihienes niiki n na E RRR veces R 6 5 6 4 Instrument layout PO E oie E O AE ROEN E PIR D E TEENA ENE E 10 4 1 Instrument layout AREER LENEE ILE EETA TTT 10 4 2 LCD display a 11 4 3 How to remove the Hard case t ttt ttt t ttre 12 5 Getting started ort ee eee eee eens 13 5 1 Checking the battery voltage t ttt t tees 13 5 2 Connecting test leadS ssc r cece 13 6 Measurement cc 14 6 1 Mains disconnection check Voltage measurement 14 6 2 Insulation resistance measurement L 00 15 6 3 Continuous Measurement ccc gt gt gt gt tee 18 6 4 DAR PI measurement gt gt gt gt gt gt gt gt cts 18 6 5 Voltage characteristics at measuring terminal 23 6 6 Use of Guard terminal c gt gt gt x gt gt gt te 23 6 7 Backlight function ay 24 6 8 Auto power off function gt gt gt x 24 7 Battery replacement i RRR RR RR ei RR 25 8 Accessories set tte ee eens 26 8 1 Metal parts for Line Probe and replacement 26 8 2 How to use the adaptor
6. ble insulation to measure only the volume resistance of insulator Make sure to use the Guard cord supplied with this instrument to connect the instrument to Guard terminal ey ELECTRIC GUARD WIRE WIRE It is possible to move out the surface leakage resistance of the insulation and measure only the volume resistance by using the Guard terminal This is helpful when performing tests in humid air 6 7 Backlight function This function to facilitate working at dimly illuminated location or at nighttime work Press the backlight button when the range switch is at any position other than OFF The backlight will light up for about 60 sec and then turn off automatically The light will not turn off automatically during a measurement 6 8 Auto power off function The instrument will automatically turn itself off if there is no function change or button press for about 10 min To return to the normal mode turn the Range switch to OFF position once and then to any desired position This function does not work during a measurement or while the instrument is giving an audible and visible live circuit warning a 7 Battery replacement A DANGER Do not open the Battery compartment cover if the surface of the instrument is wet Never open the Battery compartment cover during a measurement To avoid possible electric shock disconnect the test leads and Power Adaptor from the instr
7. ether with the tip of probe and tighten up the screws we MODEL8255 acum Male Screw N Hexagon Socket MODEL8254 E K MODEL8019 26 8 2 How to use the adaptor for recorder MODEL8302 is an adaptor for a recorder option for output current measurement Connect it as shown in the below figure Output is DC1mV when current of 1 UA is flowing To shield To recorder or Earth deUS TAE e302 1mV 14A m 3 Se WN lt n MN TASS IH A 295 ieg SOV y t 2500V z Kikvoritsu savy E Ja oF ast HIGH VOLTAGE Ye d INSULATION TESTER 250V 500V Ie S 8 3 Line probe with alligator clip optional accessory 1 MODEL7168A Line probe with alligator clip _ L T UR Z 2 MODEL7258 Long Line probe with alligator clip 15m 9 Disposing the Product Waste Electrical and Electronic Equipment WEEE Directive 2002 96 EC This Product complies with the WEEE Directive 2002 96 EC marking requirement The affixed product label see below indicates that you must not discard this electrical electronic product in domestic household waste Product Category With reference to the equipment types in the WEEE directive Annex 1 this product is classified as a Monitoring and Con
8. for recorder 77 77 27 8 3 Line probe with alligator clip optional accessory 28 9 Disposing the product ee 29 1 Safety warnings OThis instrument has been designed manufactured and tested according to IEC 61010 Safety requirements for Electronic Measuring apparatus and delivered in the best condition after passing quality control tests This instruction manual contains warnings and safety rules which must be observed by the user to ensure safe operation of the instrument and to maintain it in safe condition Therefore read through these operating instructions before using the instrument A WARNING Read through and understand instructions contained in this manual before starting to use the instrument Keep the manual at hand to enable quick reference whenever necessary The instrument is to be used only in its intended applications Understand and follow all the safety instructions contained in the manual It is essential that the above instructions are adhered to Failure to follow the above instructions may cause injury instrument damage and or damage to equipment under test OThe symbol A indicated on the instrument means that the user must refer to the related parts in the manual for safe operation of the instrument It is essential to read the instructions wherever the symbol A appears in the manual A DANGER is reserved for conditions and actions that are likely to cause serious or fata
9. he Line Probe red positive values are displayed on the LCD Be sure to turn off the circuit breaker of the circuit under test 1 Connect the Earth Cord black to the earth side of the circuit under test and the Line Probe red to the line side respectively l l 2 The voltage displayed on the F LCD shall be OV If it is not OV a voltage is applied on the circuit under test Check the circuit under test again and turn off the circuit breaker 6 2 Insulation resistance measurement A DANGER Use a measuring apparatus such as high voltage detector and confirm that there is no electrical charge in the circuit under test Wear a pair of insulated gloves for high voltage If the Range switch is at the insulation resistance range and the Test button is being pressed down high voltages are generated and applied to the test leads and the circuit under test continuously Do not touch the circuit or the test leads The Battery cover must be closed and screwed before starting a measurement Never make measurement when thunder rumbling Connect the Earth Cord black to the earth terminal of the circuit under test When any modes other than VOLT is selected live circuit warning symbol appears on the LCD and the audible warning activates if a voltage of 30V or higher is measured KEW3125A 3025A don t start a test even the Test button is pressed down if the measuring voltage is 160V or higher Bef
10. ifference is that DAR measurement can get result faster than the other Insulation resistance 1 min after a start of test Insulation resistance 15 or 30 sec min after a start of test DAR DAR 1 4 or more 1 25 1 0 1 0 or less Criteria Best Good Bad Note1 DAR time is selectable 15 or 30 sec How to select 1 Keep the DISP button pressed down and rotate the Range switch to power on KEW3125A 3025A DAR mark starts blinking 2 Press the DISP button to switch 15 sec and 30 sec displayed at the lower left on the LCD Select a desired one 3 Then power off the instrument The selected DAR time will be saved and not be cleared even when the instrument is powered off To confirm the selected time follow the step 1 fp 3 How to measure DAR PI DAR and PI are automatically measured during a normal continuous measurement of insulation resistances Set the Range switch to any desired range and measure the test object continuously 1 min after a start of continuous measurement LCD shows DAR value 10 min after a start of continuous measurement LCD shows PI value When DAR PI values are displayed as no DAR and PI values are determined by Methods 1 and 2 as described above therefore they are displayed as no when the measured insulation resistances fall under any of the following cases 1 measured value is O OMQ 2 measured value is OL
11. ined by applying a certain high voltage to the resistor insulation resistance and measuring the flowing current Resistance value Voltage Current RX V 1 LINE VOLTAGE V RESISTANCE VALUE RX CURRENT EARTH 6 3 Continuous Measurement Press and turn the Test button clockwise and lock the button to measure insulation resistances continuously Turn the button counterclockwise and set it to the initial position after a measurement A DANGER Be extremely careful not to get electric shock as a high voltage is present on the tip of the test leads continuously 6 4 DAR PI measurement 1 PI Polarization index This is to check a temporal increase of leakage currents flowing on insulations and to confirm leakage currents aren t increased as time passes PI is usually determined by the insulation resistances measured 1 min and 10 min after a measurement is started PI is dependent on the shape of insulations and influenced by moisture absorption therefore a check of PI is important 9 to diagnosis the insulation of cables Insulation resistance P 10 min after a start of test Insulation resistance 1 min after a start of test Pl 4 or more 4 2 2 0 1 0 1 0 or less Criteria Best Good Warning Bad 2 DAR Dielectric Absorption Ratio DAR measurement is almost the same to PI measurement in a sense that they test the time course of insulation The only d
12. l injury A WARNING is reserved for conditions and actions that can cause serious or fatal injury A CAUTION is reserved for conditions and actions that can cause injury or instrument damage A DANGER Never make measurements under the circumstances exceeding the designed measurement category and the rated voltage of the instrument and the test leads Do not attempt to make measurements in the presence of flammable gasses Otherwise the use of the instrument may cause sparking which can lead to an explosion Never attempt to use the instrument if its surface or your hand is wet Be careful not to short circuit the power line with the metal part of the test leads when measuring a voltage It may cause personal injury Do not exceed the maximum allowable input of any measuring ranges Do not press the Test button with test leads connected to the instrument Never open the Battery compartment cover during a measurement To prevent possible electrical shock do not touch the circuit under test during an insulation resistance measurement or right after a measurement A WARNING Never attempt to make any measurements if any abnormal conditions such as broken case and exposed metal parts are noted Do not rotate the Range switch with the test leads connected to the equipment under test Do not install substitute parts or make any modifications to the instrument Return the instrument to your l
13. n insulation resistance like a capacitive load is measured electric charges stored in capacitive circuits are automatically discharged after the measurement Discharge can be checked on the voltage monitor Backlight function to facilitate working at dimly illuminated location or at nighttime work Bar graph display Audible and visible LIVE circuit warning With Auto power off function The instrument automatically will turn itself off if there is no function change or button press for 10 min to conserve battery power Auto measurement and display of PI Polarization Index DAR Dielectric Absorption Ratio 3 Specification Applicable standards IEC 61010 1 2 030 Measurement CAT III 600V Pollution degree2 Measurement CAT IV 300V Pollution degree2 IEC 61010 031 Standard for hand held probes MODEL7165A CAT IV 600V MODEL7264 CAT IV 600V MODEL7265 CAT IV 600V When KEW3125A 3025A and the test lead are combined and used together whichever is lower category either of them belongs to is applied IEC 61326 1 2 2 IEC 60529 IP40 EN 50581 EMC standard RoHS Directive Measuring range and accuracy Temperature humidity 235C 45 75 RH Insulation resistance tester KEW3125A 3025A Rated voltage 250V 500V 1000V 2500V 0 0 100 0MQ 0 0 99 9MQ 0 0 99 9MQ 0 0 99 9MQ Measuring 80 1000MQ 80 999MQ 80 999M0Q Range 0 80 2 00GQ 0 80 9 99G0 8 0 100 0GQ STN 0 0 105 0MQ 0 0 1
14. ocal KYORITSU distributor for repair or re calibration Do not try to replace the batteries if the surface of the instrument is wet Insert the plug into the terminal firmly when using test leads Ensure that the instrument is switched off before opening the Battery compartment cover for battery replacement A CAUTION Before starting a measurement confirm that the Range switch is at an appropriate position Set the Range switch to OFF position after use Remove the batteries if the instrument is to be stored and will not be in use for a long period Do not expose the instrument to direct sunlight high temperatures and humidity or dew Use a damp cloth with alcohol for cleaning the instrument and the areas around the measuring terminals When this instrument is wet please store it after it dries The Voltage warning mark is being displayed during a measurement and it starts blinking when voltages 30V DC AC or more exist on the circuit under test Symbols Danger of possible electric shock Instrument with double or reinforced insulation User must refer to the manual gt o gt DC AC Earth terminal Crossed out wheel bin symbol according to WEEE Directive 2002 96 EC indicating that this electrical product may not be treated as household waste but that it must be collected and treated separately Dx H Measurement categories Over vol
15. ore starting a test ensure that the equipment under test is disconnected from the mains supply and not energized in order to avoid possible electrical hazards These instruments may start a test for energized electrical circuits if the measuring voltage is less than 160V This instrument measures insulation resistances and check whether the insulations of electrical equipments or circuits are in good condition or not So please check the voltage that can be applied to the equipment under test before making a measurement Note The insulation resistance values of the equipments under test may not be stable and the readings may be unstable Bleep sound may be heard during an insulation resistance measurement but it is not malfunction 5 lt takes time to measure a capacitive load At insulation resistance measurement positive voltage is outputted from the Earth terminal and negative voltage is outputted from the Line terminal Connect the Earth cord to the Earth ground terminal It is recommended to connect the positive pole to the earth side when measuring insulation resistance against the ground or when a part of the equipment under test is earthed With this connection smaller measured value can be obtained comparing with other way round 1 Check the voltage which can be applied to the circuit under test and set the range switch to a desired insulation resistance range 2 Connect the Ea
16. rd black to the Earth terminal and the Guard Cord green to the Guard terminal A Guard cord connection may not be required if there is no need to establish a guard A DANGER If the Test button is pressed when the Range switch is at the insulation measurement positions high voltage may be applied to the test leads and you may get an electric shock S ea 6 Measurement 6 1 Mains disconnection check Voltage measurement A DANGER Never make measurements under the circumstances exceeding the designed measurement category and the rated voltage of the instrument and the test leads When testing installations which have large current capacities such as a power line be sure to make measurement on the secondary side of the circuit breaker in order to avoid getting an electrical shock Extra caution should be taken to minimize the possibilities of shorting the power line with the metal tip of test lead at voltage measurement It may cause personal injury The Battery cover must be closed and screwed before starting a measurement Connect the Earth cord black to the Earth terminal of the circuit under test Voltage can be measured by setting the Range switch on this instrument to Vac oc position No need to press the Test button This instrument is equipped with an AC DC auto detection circuit and can measure DC voltage During a DC voltage measurement when applying a positive voltage to t
17. rth cord black to the Earth terminal of the circuit under test 3 Place the tip of the Line probe red to the circuit under test Then press the PRESS TO TEST button The buzzer sounds intermittently during a measurement when a range other than 250 500V is selected 4 The measured value will be displayed on the LCD and it is kept displayed after the measurement A Caution Always turn off the Breaker for the circuit under test 5 This instrument has an auto discharge function With the test leads connected to the circuit under test release the Test button to discharge capacitances in the circuit after test Confirm that the indication on the voltage monitor becomes OV A DANGER Do not touch the circuit under test immediately after testing Capacitances stored in the circuit may cause electric shock Leave the test leads connected to the circuit and never touch the circuit until a discharge is complete Auto discharge function This is a function to release the capacitances stored in the circuit under test automatically after test The voltage monitor shows the discharge condition This function will be disabled by disconnecting the test leads 2sec or more before discharge is complete 6 Set the Range switch to OFF position and disconnect the test leads from the instrument H C Principle of Insulation Resistance Measurement A resistance value can be obta
18. tage categories To ensure safe operation of measuring instruments IEC 61010 establishes safety standards for various electrical environments categorized as O to CAT IV and called measurement categories Higher numbered categories correspond to electrical environments with greater momentary energy so a measuring instrument designed for CAT III environments can endure greater momentary energy than one designed for CAT Il O Circuits which are not directly connected to the mains power supply CAT II Electrical circuits of equipment connected to an AC electrical outlet by a power cord CAT III Primary electrical circuits of the equipment connected directly to the distribution panel and feeders from the distribution panel to outlets CAT IV The circuit from the service drop to the service entrance and to the power meter and primary overcurrent protection device distribution panel Incoming wire Interior wiring Z O Device which is CAT IV CAT III not directly connected to the mains power supply S Socket 2 Features KEW3125A 3025A are high voltage insulation resistance testers with 5 range 3125A 4 range 3025A for measuring insulation resistance Designed to meet the following safety standards IEC 61010 1 2 030 CAT III GOOV CAT IV 300V Pollution degree 2 IEC 61010 031 Requirements for hand held probes With auto discharge function When a
19. trol instrumentation product Disposing lead storage batteries When you throw away the batteries be sure to cover their positive and negative terminals and always observe local laws and regulations Insufficient insulation of the terminals may cause explosion or fire because electrical energies remain in lead storage batteries after use 90 DISTRIBUTOR Kyoritsu reserves the rights to change specifications or designs described in this manual without notice and without obligations KYORITSU ELECTRICAL INSTRUMENTS WORKS LTD 2 5 20 Nakane Meguro ku Tokyo 152 0031 Japan Phone 81 3 3723 0131 Fax 81 3 3723 0152 Factory Ehime Japan www kew ltd co jp 02 15 92 2189
20. ue Elapsed time 15 or 30 sec Value measured 15 or 30 sec after a start of test resistance value output voltage DAR value Elapsed time 1 min Value measured 1 min after a start of test resistance value output voltage C DAR value A Elapsed time 10 min Value measured 10 B min after a start of test resistance value output voltage C Pl value 6 5 Voltage characteristics at measuring terminal KEW3125A 3025A Output characteristics 6000 5000V range 5000 d 4000 D s S 3000 2500V range 5 L Z 2000 O Jo 1000V range 500V range 0 250V range 0 1 1 10 100 1000 10 100 1000 MQ MO MO MQ Mo GQ GQ Ga Insulation resistance 6 6 Use of Guard terminal When measuring the insulation resistance of a cable leakage current flowing on the surface of cable jacket and the current flowing inside the insulator are mixed and may cause error in insulation resistance value In order to prevent such error wind a conductive wire around the point where leakage current flows Then connect it to the Guard terminal This is to move out the surface leakage resistance of the ca
21. ument before replacing batteries After replacing batteries make sure to tighten up the screw for the Battery compartment cover A CAUTION Do not mix new and old batteries Make sure to install batteries in correct polarity as marked inside 1 Set the Range switch to OFF position and disconnect the test leads from the instrument 2 Loosen the Battery compartment cover fixing screws and remove the Battery compartment cover Remove all eight batteries and replace them with new ones 3 After replacing batteries be sure to tighten up the screw for the Battery compartment cover SCREW Make sure to install batteries in correct polarity as marked inside 8 Accessories 8 1 Metal parts for Line Probe and replacement A DANGER Attach MODEL8255 to the test leads to use the instrument in CAT Il or higher environments MODEL8254 and 8019 have exposed large metal parts therefore they may short circuit the equipment under test and also may damage the equipments under test cause fire or pose fatal or serious injuries to the users 1 Tip metal parts MODEL8255 Standard Prod straight type with molded parts MODEL8254 Straight Type Prod MODEL8019 Pickel Type Prod To be used to hook the instrument 2 Replacement Turn the Line probe counterclockwise to remove the attached tip metal Put the tip metal you want to use to the hexagon socket and turn it clockwise tog
22. unts Vacyoc range Max 630counts Bar graph Max 36points DAR PI value Max 9 99 Time Max 99 59 Battery symbol in 4 levels OL mark appears on insulation resistance range Hi mark appears on voltage range Range shifts to upper range 1000counts Range shifts to lower range 80counts Only on the insulation resistance range The instrument will be powered off if there is no switch or button operation for 10 min This function does not work during a measurement 2000m or less Temperature amp humidity range guaranteed accuracy 23 C 5 C Relative humidity 85 or less no condensation Operating temperature amp humidity range 0 C to 40 C Relative humidity 85 or less no condensation Storage temperature amp humidity range 20 C to 60 C Relative humidity 75 or less no condensation Overload protection Withstand voltage Insulation resistance range AC1200V 10sec Voltage range AC720V 10sec AC5160V 50 60Hz 5sec Between electrical circuit and enclosure Insulation resistance 1OOOMQ or more DC1000V Dimension Weight Power source Between electrical circuit and enclosure 177 L X226 W x100 D mm KEW3125A approx 1 9kg battery included KEW3025A approx 1 7kg battery included DC12V LR14 Alkaline battery size C x 8pcs Current consumption representative values at 12V of supply voltage Range 250V 500V 1000V 2500V 5000V Vacroc Output
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