Manual - Meco Instruments P.Ltd
Contents
1. Re R eq 4680B 28 09 2012 7 ELECTRICAL SPECIFICATION Ground Resistance Auto range Loop resistance noninductive external field lt 50 A m 4680 or lt 200 A m 4680B external electrical field lt 1 V m conductor centered Resistance Measurement Frequency 3 333KHz High and Low Alarm Pp e Resolion 17 Ground Leakage Current Auto range 50 60 Hz TRMS Crest Factor lt 3 0 for 4680 or lt 3 5 for 4680B 4 00 30 00 A 4680 4 00 35 00 A 4680B Accuracy of Resiatance Calibration Plate 1 Data Logging Capacity 116 records Data Logging Interval 1 to 255 seconds 18 8 GENERAL SPECIFICATIONS Conductor Size 23 mm approx 4680 35 mm approx 4680B 27 mm approx 4680 38 mm approx 4680B Battery Type 9V IEC 6 LR61 Alkaline Display Type 4 digits 9999 counts LCD Range Selection Auto Auto Power Off About 4 to 6 minutes Overload Protection 100A continuous 200A 5 sec Overload Indication OL Power Consumption 40mA approx Low Battery Indication Battery Life 3000 measurements Temperature coefficient 0 1 x specified spec C lt 18 C or gt 28 C Sampling Time 0 5 seconds Operating Temperature 0 C to 50 C 14 F to 122 F Operating Humidity Less than 85 RH Storage Temperature 20 C to 60 C 4 F to 122 F Storage Humidity Less than 75 RH Dimension 257 x 100 x 47mm approx 4680 276 x 100 x2. 47mm approx 4680B Weight 640gms including battery approx 4680 750gms including battery approx 4680B Resistance Calibration Plate x 1 9V Battery Installed x 1 Instruction Manual x 1 Carrying Box x 1 Cleaning Brush x 1 Jaw Opening Accessaries 19 9 Battery Replacement When the low battery symbol is displayed in LCD replace the old battery with new battery 1 Turn the power off Remove the screw of the back cover Lift and remove the back cover Remove the old battery Install a new 9V battery or oO eS Ns Place the back cover and secure the screw A EN 61010 eoo 0 20 4680B 28 09 2012 10 Maintenance amp Cleaning Servicing not covered in this manual should only be performed by qualified personnel Repairs should only be performed by qualified personnel Periodically wipe the case with a damp cloth and detergent do not use abrasives or solvents 21 meco Certificate of Calibration We hereby certify that this product has been calibrated and found to be in accordance with the applicable SPECIFICATIONS and STANDARDS Accuracies of the standard equipment used in this calibration are traceable to the National Standards MECO METERS PVT LTD Plot No EL 60 MIDC Electronic Zone TTC Industrial Area Mahape Navi Mumbai 400710 INDIA Tel 0091 22 27673311 16 27673300 Board Fax 0091 22 27673310 27673330 E mail sales mecoinst com Web www mecoi
3. Battery When the battery voltage is lower than required this symbol will be shown in LCD 9 NO Indicate the READ function 10 REC Indicate data logging is in progress 11 AP If this symbol is displayed in LCD that means the unit will be turned off in 4 to 6 minutes 6 5 OPERATION INSTRUCTION 5 1 Ground Resistance Measurement 1 Open the jaws and make sure the jaws mating surfaces are clean and free of dust dirt or any foreign substance Snap the jaws few times to let the jaws sit on the best mating position Turn the power on set the rotary switch at V position Do not clamp on to any conductor or open the jaws at this moment or during self calibration At powering on clamp on ground resistance tester will do the self calibration for better accuracy Users should wait for self calibration to be complete During the self caiibration LCD will show CAL5 CAL4 CAL 3 CAL2 and CAL1 When the ground tester is ready a beep sound will be heard Clamp on to the electrode or ground rod to be measured Snap the jaws few times for better accuracy Read the value of ae ground resistance from LCD For better measurement Must snap the jaws few times before powering on Do not clamp on to any conductor at the moment of powering on Snap the jaws few times after clamping on to ground electrode If self calibration does not stop That is because the self calibration i
4. EN 61010 2 032 CAT Il 600V CAT Ill 300V Pollution Degree 2 Definition of Symbols Caution Refer to Accompanying Documents AX Caution Risk of Electric Shock E Double Insulation Over voltage Category CAT Equipment for connection to circuits in which measures are taken to limit the transient over voltages to an appropriate low level meee Ht etd he ib TIM Tri i ivi lah Fi il lai hie idih gy gi Over voltage Category II CAT Il ni Energy consuming equipment to be supplied from the fixed a rah installation Over voltage Category Ill CAT Ill CE SAT TE IDO CLAMP ON Equipment in fixed installations 4 GROUND EARTH RESISTANCE WARNING TESTER If the clamp meter is used in a manner Not specified by the manufacturer the protection provided by the clamp meter may be impaired MODEL i 4680 If jaws are damaged in any way please stop operating A680B this clamp and return it to qualified personnel for repair 4 USER MANUAL j TABLE OF CONTENTS 1 WARNING 1 WARNING 4 1 Use of rubber gloves is a good safety practice even if the WARNING co seeceacuseccostcossasessusdecacoteessceseusecencadees weseunaceddaness eguipment proseniooericd and ondea 2 FEATURES OF DESCRIPTION scscsciscesccssenisctscetessteeaenters 4 2 Safety is the responsibility of the operator 3 PANEL DESCRIPTION c scccccssesssessessessessessesstessesseesees 5 3 Use extreme caution when using the instrument around
5. NCE AND CLEANING ccccccceeeeeeeeees 00 3 4 4680B 28 09 2012 3 PANEL DESCRIPTION Oo ON oR wo PD Bo Tn S GROUND TESTER or amp Jaws Assembly Enclose electrode or ground rod No air gap is ailowed between two half jaws Hold Button Press this button to hold the value in LCD Rotary Switch Turn power on and select function LCD REC button When one of the functions is selected by FUNC button it is used to increment value If no function is selected it is used to start data logging or record one data Vv button To decrement value press this Button Jaws Trigger A button To increment value press this button FUNC button Press this button to se ect function of HI high alarm LO low alarm SEC seconds or no read 4 LCD DISPLAY 1 Function Display current selected function or current record number 2 Digits Display value from 0 to 9999 with decimal point 3 Ohm Symbol will be shown in V and alarm functions 4 mA Display ground leakage current in mA or A 5 9 This symbol will be shown if the rotary switch is set at the alarm position 6 NOISE When ground resistance tester senses noise existed in the ground electrode or ground rod this symbol will be shown in LCD 7 Jaw Open When the jaw is open during measurement this symbol and word OPEN will be shown in LCD 8 Low
6. a a LY YY LY LY Ly g 00000 09 2 l A CUN E 5 7 Clear Data Memory Press and hold the REC button then turn the power on Letters of CL will be shown to indicate that memory is cleared pae a FD bL L e a a eee 5 8 Cancel the Auto Power Off When the unit is turned on a symbol of AP is displayed in LCD That means the unit will turn itself off in about 4 to 6 minutes To cancel this function user can hold the FUNC button then turn the power on Symbol of AP will not be displayed in LCD 14 6 PRINCIPLE OF OPERATION Below is a simplified typical ground distribution system Its equivalent circuit is shown in Figure A If R R R R is combined as R then only R and R are left in the circuit refer to Figure B If a constant voltage is applied to the circuit following equation will be constructed J fen g eq where Req L eee hn S if R and R R R are about the same and n is a large number such as 200 then R Will be much less than R and may be approach zero Ri R gt gt R Req gt 0 Example If R and R R R are all 10 V respectively and n 200 Then Eve by calculation equals In this example we can see that as long as the number of multiple electrodes is large enough the equivalent resistance is negligible with respect to the ground resistance to be measured 15 Ron Figure A FigureB ee ee o
7. e current measurement is smaller than the LO value the unit will beep and show LO in the upper row of LCD DoD pain Goan 23 ZJ EF Spo ao ba 23 10 NOTE If the HI value is set at OL or the LO value is set at 0 the ALARM function will not be performed So they are method to disable one of the HI or LO alarm NOTE The HI value can t be smaller than the low value And the LO value can t be larger than the HI value HI value will be adjusted to LO value plus 1 when roll over occurs The maximum value of LO value is HI value minus 1 NOTE If data logging is progressing sound of beeping will be disabled to save battery power But the LCD still shows the warning letters of HI or LO NOTE The values for the high and low alarm are stored in the memory They are restored when the power is turned on 11 5 3 Ground Leakage Current Measurement 1 Turn the power on and set the rotary switch at the mA or A position 2 Clamp on to the electrode or ground rod 3 Read the value of leakage current displayed in LCD 12 4680B 28 09 2012 5 4 Setting the Sampling Interval 1 Press the FUNC button until letters of SEC are shown in the upper row of LCD 2 The unit shows the current sampling interval in seconds 3 Press the A or V button to increment decrement the value by 1 second As users hold the bu
8. energized electrical equipment 4 LCD DISPLAY ee ee 6 4 Do not attempt to use the ground tester to twist or pry the 5 OPERATION INSTRUCTION c ccssceseessessessesseseeseeseeee 7 ground electrode ar ground wire away from the equipment l being grounded 5 1 Ground Resistance Measurement 2 00 8 9 5 All metal objects or wires connected to the electrical 5 2 High and LOW Alarm wiccees cs cocescceiccteteccinavauatecseeecsens 10 system should be assumed to be lethal until tested Grounding system is no exception 5 3 Ground Leakage Current Measurement 12 2 FEATURES DESCRIPTION 5 4 Setting the Sampling Interval cccccceeeseeee 13 The clamp on ground resistance tester enable the users to measure ground resistance of ground rod without the use of 5 5 Data Logging ee E rer eee rte Tree re eee 13 auxiliary ground rods Clamp on ground resistance tester is 5 6 Read the Data Stored in Memory eceeeee 14 used in multi grounded systems without disconnecting the ground under test 5 7 Clear Data Memory ccccccccsssesssseeeeeeeeeennneees 14 5 8 Cancel the Auto Power Off cccssseeeeeeeeeeeeeees 14 6 PRINCIPLE OF OPERATION wccctcncescenntccsctvecscrdcenceadeon 15 7 ELECTRICAL SPECIFICATION cc eeeeeeeeeeeeeeees 16 8 GENERAL SPECIFICATIONS cccccccseeseeeeeeeeeeeees 18 9 BATTERY REPLACEMENT c ccccccceeesssssseeeeeeeees 19 10 MAINTENA
9. nst com SR NO CHECKED BY DATE MODEL NO 4680B 28 09 2012
10. s not complete Ground tester will continue the process until a proper self caiibration is done Check the jaw mating surfaces If there is any dirt dust or any foreign substance clean the surface 3 Do not open the jaws during self caiibratian Note Noise present in the electrode or ground rod If there exists over excessive current or 30V in ground rod a symbol of NOISE will be shown in LCD Under the pres ence of noise the reading is no longer accurate Note If jaw is open during measurement a symbol of OPEN will be displayed in LCD 4680B 28 09 2012 5 2 High and Low alarm 1 Set the rotary switch at the position 2 Press the FUNC button to select HI or LO alarm The current value of High or Low alarm will be shown in the upper row of LCD 3 Press the A or V button to increment or decrement the value by 1 ohm As users hold the button longer the speed of incrementing or decrementing will become faster The value can be increment from 0 ohm to 1510 ohm and then OL The value will roll over to O if the current value shows OL 4 Once the value is set press the FUNC button several times until the upper row LCD show no letters 5 When the rotary switch is set at the position The unit will compare the current value with the high and low values If the current measurement is larger than HI value the unit will beep and show HI in the upper row of LCD If th
11. tton longer the speed of incrementing decrementing will become faster The value can be incremented decremented from O to 255 255 to 0 seconds Value will roll over when the value of maximum 255 minimum O seconds is reached 4 Press the FUNC button several times until the upper row LCD show no letters NOTE The sampling interval is used for data logging 5 5 Data Logging The unit will start data logging if the REC button is pressed and a symbol of REC will be shown in LCD Data will be recorded at the specified sampling interval Data logging will be stopped if the memory is full or the unit detects the condition of low battery or the REC button is pressed again NOTE If the sampling interval is set at O seconds only one data is recorded To record next data users can press the REC button again The record number is also displayed for about 1 seconds 5 6 Read the Data Stored in Memory This function allows users to read the stored data at site if no PC is available 1 Press the FUNC button until a symbol oi NO is shown in LCD The current record number is shown in the upper row of LCD And the data is shown in the lower row of LCD 2 Press the A or V button to read the next or previous data 3 If the users hold the A or V button longer the record number will be incremented decremented faster The record number will roll over when the last first record is reached Le
Download Pdf Manuals
Related Search