User`s Manual
Contents
1. lt 1 gt Model 320731 lt 2 gt Model 320732 Measurement Insulation Resistance Earth Resistance Earth Voltage AC Voltage AC Current Rating lt 1 gt 500V 100 MQ lt 2 gt 250V 50 15000 e 0 15 30 75 Range 0 15 150 1500Q 0 30V 150 300A Model is to be specified 280 520V 2719891 Constant voltage converter Constant current inverter Rectification Suppression Rectification Clip Current transrormet measurement Rectification 5 of reading within the 1st effective measuring range Accuracy 10 of reading within 3 of full scale 3 of full scale 1 5 of full scale 2 5 of full scale the 2nd effective measuring range 0 7 or less of scale length at zero and infinity Scale Three digit logarithmic Black Uniform Blue Uniform Blue Uniform Red Uniform Black Remarks Terminal voltage indicated by a central Measuring frequency Allowable earthing voltage scale is more than 90 of the rated voltage 1 8kHz 5V For both 50 and 60Hz Dimensions Approx 140 x 210 x 142 mm Including bag Weight Approx 2 3 kg Including bag Battery R6P SUM 3 8 pcs Batteries Accessories R6P SUM 3 8 pcs built in Leads for insulation resistance and V measurement B9606CR 1 set black and orange 1 5m Leads for earth resistance measurement B9605KN 1 set green yellow and red 5 10 20m Auxiliary spikes for earth resistance measurement B9606CD 2 pcs 32cm Clip on current transform2. Do not operate the instrument in an atmosphere where any flammable or explosive gas is present Do not use the instrument if there is condensation on it O Disassembly Do not attempt to disassemble the instrument E Be sure to follow the instructions below to avoid electrical shock or other dangers that may result in injury of personnel or damage to the instru ment A Measurement Do not apply a voltage over the allowable limits between the terminals Do not apply a voltage to the measurement terminal during the measurement of resistance O Power supply to measured object Metals and wring connected to the electric equipment may have a voltage being applied Confirm that no voltage are being applied prior to connecting the measure ment terminal The same precaution applies to the grounding system O Batteries Do not use different types of batteries together nor new and old batteries together In the case that the instrument is not used for a long period store the instrument with the batteries removed The batteries may otherwise leak acid which will damage the instrument E Notice Regarding This User s Manual 1 The information covered in this user s manual is subject to change with out prior notice 2 No part of this document may be reprinted or reproduced without autho rization 3 Every effort has been made to ensure accuracy in the preparation of this manual Should any err
3. Model 3207 has been designed with full consideration of the functions required for a handy portable maintenance instru ment E Two ratings of insulation resistance 500V 100M2 Model 320731 250V 50M2 Model 320732 3207 3 NAMES OF PARTS 1 Range dial Selects the measuring function and set range 2 Terminal guide Indicates where to connect the measuring lead 3 Measuring terminals Terminals for connecting the measuring lead 4 Connector for probe switch Connecter to use the probe with an insulation resistance measuring switch sold separately 5 Carrying bag Hard Storage case for the main body A knapsack is available for storing accessories IM 3207 E Indicator Indicates the measured value Zero adjuster Screw to adjust the indicators mechanical zero position Usually there is no need for adjustment Push button switch can be locked Press this switch to start measurement Hold down this switch and turn it clockwise to lock it 4 FUNCTION Function Symbol Rating Insulation MQ lt 1 gt 500V 100 MQ _ resistance Black lt 2 gt 250V 50 MO un 0 to 15 150 15002 resistance Blue 70 to 130 V AC voltage 140 to 260 V Compatible 280 to 520 V with 50 and 0 to 15 30 75 150 60 Hz 300 with Black lt 1 gt Model 320731 lt 2 gt Model 320732 Other check functions Battery built in Check B
4. Blue Earth resistance Check CH Blue Earthing voltage Check EV Blue 0 to 30 V IN CAUTION Do not change the range dial during measurement 5 OPERATION 5 1 Battery Check B 1 When insulation resistance and earth resistance are measured battery check should be made in advance Set the range dial to and push the switch If the indicating pointer stays within the blue belt the built in batteries are of use 2 If the pointer dose not reach the belt the batteries must be replaced with new ones For details see 6 Battery Replacement 5 2 Insulation Resistance Measurement MO 1 Set the range dial to MQ and connect the acces sory leads black and orange to the respective mea suring terminals E Earth and L Line Then con nect the leads between the probes and the object and press the switch to read the insulation resistance directly 2 When using Guard connect to G terminal Central terminal 3 The probe switch an accessory sold separately can be used as the line probe which is connected to the socket on the instrument Measuring terminals Terminal guide gt IM 3207 E 5 3 Earth Resistance Measurement EQ 1 Set the range dial to CH make connections as IM 3207 E shown in Fig 1 with the accessory leads green yellow and red and the auxiliary spikes P C Push the switch to assure that the pointer comes into the CH
5. N a User s 3207 Manual Insulation Polytester Model 320731 320732 YOKOGAWA mE Yokogawa Meters amp Instruments Corporation 4th Edition Sep 2007 SAFETY PRECAUTIONS m The following safety symbols are used the instrument and in this manual Danger Handle with Care This symbol indicates that the operator must refer to an explanation in the User s Manual in order to avoid risk of injury or death of personnel or damage to the instrument Be sure to exercise special care in the following to avoid electrical or other dangers that may result in injury or the loss of life of personnel A WEG During measurement of ground resistance A high voltage is generated on the measurement leads during the measure ment of ground resistance Do not touch the ground spikes or the measurement terminal Measurement lead Use the lead supplied by Yokogawa for the instrument concerned Do not use a deteriorated or damaged lead Do not attach detach the lead to from the instrument prior to releasing it from the measured object Protection If the case cracks from being dropped or struck it may fail to be properly insulated Do not use it until it can be repaired Replacement of batteries Prior to detaching the cover for replacing the batteries release the measure ment lead from the measured object and do not touch the measurement switch A high voltage may otherwise be generated Operating Environment
6. be replaced with all new Clip on a current line cable at the center of the core ones R6P SUM 3 8 pcs To replace batteries take off the as shown in Fig 5 Errors by displacement from the cen covering case by loosening two screws and put new batteries ter are less than 1 in the place of consumed ones according to the polarities de scribed on the battery holder Do not touch the parts and wires inside when removing the covering case Position for cable Clip on CT Fig 5 IM 3207 E 7 CAUTION 8 OPTIONAL ACCESSORIES 1 Lock of the pushbutton switch The following accessories are sold separately When using ranges B MQ CH and EQ it is necessary to O Part No B9606FA Probe switch for Insulation Resis push the switch each time And in case of long time mea tance Measurement Cable length approx 1m surement the switch can be locked by merely turning it Old Part No B9646CE clockwise after pushing O Part No B9646CG Auxiliary nets for Earth Resistance After measurement unlock the switch to turn off Measurement 2 pcs 30 x 30 cm 2 If it is wet around the measuring terminal especially dur ing insulation resistance measurement dry off the area before use 3 Range check Always check the setting position of the range dial and the connection of terminals before starting measurement Do not change the setting position of the range dial dur ing measurement 7 IM 3207 E 9 SPECIFICATIONS
7. A ENGINEERING ASIA PTE LTD SINGAPORE Phone 65 6241 9933 Facsimile 65 624 1 2606 YOKOGAWA AMERICA DO SUL S A BRAZIL Phone 55 11 5681 2400 Facsimile 55 11 5681 1274 YOKOGAWA MEASURING INSTRUMENTS KOREA CORPORATION KOREA Phone 82 2 551 0660 to 0664 Facsimile 82 2 551 0665 YOKOGAWA AUSTRALIA PTY LTD AUSTRALIA Phone 61 2 9805 0699 Facsimile 61 2 9888 1844 YOKOGAWA INDIA LTD INDIA Phone 91 80 4158 6000 Facsimile 91 80 2852 1441 YOKOGAWA SHANGHAI TRADING CO LTD CHINA Phone 86 21 6880 8107 Facsimile 86 21 6880 4987 YOKOGAWA MIDDLE EAST E C BAHRAIN Phone 973 358100 Facsimile 973 336100 LTD YOKOGAWA ELECTRIC RUSSIAN FEDERATION Phone 7 095 737 7868 Facsimile 7 095 737 7869 IM3E 2006 2
8. an approximately 5V Amark on the scale it will bring about an error in measuring the earth resistance Therefore the measurement should be proceeded by disconnecting the switches shown in Fig 4 and marking sure that EV is small enough A large EV means that the wiring or loads are poorly insulated and so the insulation resistance test must be kept within the MQ range of this tester gt Leakage current Switch Wiring Switch Load ZN BANY 7 gt erase IA A AAA Ev Earting Voltage Transformer Bu to Fig 4 5 4 AC voltage Measurement v Set the dial to a suitable range of V according to the voltage to be measured Connect the accessory leads to the terminals The leads are used for insulation resis tance measurement too y has both 130 V and 520 V ranges Upon connect ing to the central terminal both ranges are converted to 260 V Each range has a suppressed zero scale whose me dian is respectively 100 V 200 V and 400 V Measuring terminas Terminal guide 520V 130V 260V IM 3207 E 5 5 AC Current Measurement A 6 BATTERY REPLACEMENT Set the dial to a suitable range of A and connect the chips of Clip on CT Part No B9103BA with the terminal When the pointer stays out of the blue belt B during 5 1 A CT Battery Check the batteries should
9. blue belt Then turn the dial to EQ and push the switch again selecting a suitable range ac cording to the earth resistance Connect earthing electrodes E and auxiliary spikes P C to the main body using the accessory lead lines as shown in Fig 1 Leave space of 5 to 10 m be tween E and P and between P and C respectively E P and C should be approximately in a line Fig 1 2 If the pointer does not stay within the CH blue belt auxiliary spikes should be more tightly stuck into the ground For auxiliary earthing there are other meth ods shown in Fig 2 according to the ground condi tions To use the auxiliary net sold separately Soft ground Z AIII Hard ground Auxiliary nets Fig 2 3 Simplified two electrode method When measuring earth resistance D a simplified measuring method is available where there is some thing to serve as an almost perfect earthing like a water pipe Plastic pipe must be avoided Fig 3 The distance between the earth E and water pipe must be 5 to 10 m 5to 10m Fig 3 Earthing voltage Check EV Poorly insulated wiring or equipment may cause an earthing voltage EV due to the leakage current through the earthing resistance to be measured If this earthing voltage is too high it may cause an er ror in measurement To detect EV turn the dial to EV and if it is more th
10. er B9103BA lead length 2m Accessory carrying bag B9606CH Fabric knapsack Carrying bag B9646CK black shoulder bag hard Nameplate English names is to be specified User s manual 1 copy Effective measuring range AC Voltage IM 3207 E The range from a resistance value one thousandth 1 1000 the maximum effective reading to the resistance value that is nearest to half 1 2 the maximum effective reading and equal to the maximum effective reading multiplied by 1 2 or 5 or by any of these values multiplied by ten 10 raised to a whole number power shall be referred to as a first effective measuring range In addition the range from the upper limit of the first effective measuring range to the maximum effective reading shall be referred to as second effective measuring ranges Caution A suppressed zero instrument swings in the opposite direction when measuring a voltage which is below the rating 85 MEMO 9_ IM 3207 E MEMO IM 3207 E 10 YOKOGAWA 4 Yokogawa Meters amp Instruments Corporation Yokogawa Meters amp Instruments Corporation International Sales Dept Tachihi Bld No 2 6 1 3 Sakaecho Tachikawa shi Tokyo 190 8586 Japan Phone 81 42 534 1413 Facsimile 81 42 534 1426 YOKOGAWA CORPORATION OF AMERICA U S A Phone 1 770 253 7000 Facsimile 1 770 251 2088 YOKOGAWA EUROPE B V THE NETHERLANDS Phone 31 334 64 1611 Facsimile 31 334 64 1610 YOKOGAW
11. ors or omissions come to your attention however please inform Yokogawa accordingly 4 Yokogawa is by no means liable for any damage resulting from the user s mishandling of the product IM 3207 E Table of Contents Page 1y GENERAL ci da 1 2 FEATURE cnt ds 1 3 NAMES OF PARTS 42 32 iia 2 4 FUNCTION costra are 3 5s OPERATION are 3 6 BATTERY REPLACEMENT 6 Te CAUTION omic es 7 8 OPTIONAL ACCESSORIES 7 9 SPECIFICATIONS 8 IM 3207 E 1 GENERAL 2 FEATURE The Model 3207 which is indispensable for the inspection E Compact lightweight tough and easy to operate of private electric facilities electric appliances and distribu E Five measurements in one instrument tion lines is a measurement instrument equipped with five e Insulation resistance functions for measuring insulation resistance earth resistance Insulation resistance tester earthing voltage AC voltage and AC current and is frequently Earth resistance used for maintenance Earth resistance tester This instrument is composed of a power source circuit in Earth voltage dicator and cover The circuit modules are mounted on the AC voltage single printed circuit board Taut band meters and impact re AC voltmeter sistant plastic are used for the indicator and the cover re AC current spectively for excellent resistance to vibration and shock The AC ammeter
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