Users Manual
Contents
1. Re 5 2 High and Low Alarm 1 Set the rotary switch to the position 2 Press the FUNC button to select or LO alarm The current value of High or Low alarm will be displayed on the upper row of the LCD 3 Press the A button or W button to increment decrement the value by 1 ohm As users hold the button longer the speed of incrementing decrementing will become faster The value can be increment from 0 ohm to 1510 ohm and then OL Or the value can be decrement from OL to 1510 ohm to o ohm The value will roll over to OL O if the current value is 0 OL 4 Once the value is set press the FUNC button several times until the upper row of the LCD displays no letters 5 When the rotary switch is set to the position The unit will compare the current value with the high and low alarm values If the current measurement is larger than the HI value the unit will beep and show HI in the upper row of LCD If the current measurement is smaller than the LO value the unit will beep and show LO in the upper row of LCD R LOOP NOTE the HI value is set at OL or the LO value is set at 0 the ALARM function will be disabled So they are method to disable one of the or LO alarm NOTE The HI value can t be smaller than the low value And the LO value can t be larger than2. AMPROBE DGC 1000A CLAMP ON GROUND RESISTANCE TESTER USERS MANUAL GROUND TESTER 9 3 8 ivit EN 61010 2 032 4 CAT III 300V CAT II 600V Pollution Degree 2 Definition of Symbols N Caution Refer to Accompanving Documents Caution Risk of Electric Shock Double Insulation Table of Contents Puce 1 FEATURES DESCRIPTION 1 PANEL DESCRIPTION LL 2 IV ECD DISPLAY decet 3 V OPERATION INSTRUCTION 4 5 1 Ground Resistance Measurement 4 5 2 High and Low Alarm 78 uuo e cir Ee tab 7 5 3 Ground Leakage Current Measurement 9 5 4 Setting the Sampling Interval 10 5 5 Data LOGGING eis ii rt 10 5 6 Read the Data Stored in 11 5 7 Clear Data Memory 11 5 8 Cancel the Auto Power nanna 11 VI PRINCIPLE OF OPERATION 11 ELECTRICAL SPECIFICATION 14 GENERAL SPECIFICATIONS 15 IX BATTERY REPLACEMENT eren nnne nnne 16 WARNING
3. 1 Use of rubber gloves is a good safety practice even if the equipment is properly operated and grounded 2 Safety is the responsibility of the operator 3 Use extreme caution when using the instrument around energized electrical equipment 4 Do not attempt to use the ground tester to twist or pry the ground electrode or ground wire away from the equipment being grounded 5 All metal objects or wires connected to an electrical system should be assumed to be lethal until tested Grounding system is no exception FEATURES DESCRIPTION The clamp on ground resistance tester enables the users to measure ground resistance of a ground rod without the use of auxiliary ground rods Clamp on ground resistance tester is used in multi grounded systems without disconnecting the ground under test lil PANEL DESCRIPTION GROUND TESTER ER 1 Jaws Assembly Enclose electrode or ground rod No air gap is allowed between two half jaws 2 Hold Button Press this button to freeze the value in LCD 3 Rotary Switch Turn power on and select the desired function 4 LCD 5 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 point W button To decrement value press this button Jaws Trigger A button To increment value press this button FUNC button Press this but
4. Range Resolution High Alarm 10 Lo Alarm 0 15100 10 Ground Leakage Current Auto range 50 60 Hz True RMS Crest Factor lt 3 0 20 0 05 mA 20 0 03 20 3 mA Auto range 50 60 Hz True RMS Crest Factor lt 3 0 Accuracy of Reading 2 0 0 03 3 0 0 03 Accuracy of Resistance Calibration Plate 0 5 Data Logging Capacity 116 records Data Logging Interval 1 to 255 seconds 14 GENERAL SPECIFICATIONS Conductor Size Battery Type Display Type Range Selection Overload Indication Power Consumption Low Battery Indication Battery Life Sampling Time Operating Temperature Operating Humidity Storage Temperature Storage Humidity Dimension Weight Accessories 23mm 0 9 approx 9 IEC 6 LR61 Alkaline 4 digits 9999 counts LCD Auto OL 40mA B 3000 measurements 0 5 seconds 0 C 50 C 14 F to 122 F Less than 85 RH 20 C to 60 C 4 F to 122 F Less than 75 RH 257mm L x 100mm W x 47mm H 10 1 L x 3 9 W x 1 9 H 640g 1 4lbs Resistance Calibration Plate x 1 9V Battery Installed x 1 Users Manual x 1 Carrying Box x 1 15 IX BATTERY REPLACEMENT When the low battery symbol is displayed on the LCD replace the old battery with new battery the power off Remove the screw of the battery cover Lift and remove the battery cover Remove the old bat
5. instrument only and no other obligation is stated or implied A Miramar FL 33025 17 Tel 954 499 5400 Toll Free 800 327 5060 Fax 954 499 5418 18
6. moment or during self calibration 4 At power up the 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 calibration LCD will show CAL5 CAL4 CAL 3 CAL2 and CAL1 5 When the ground tester is ready a beep sound will be heard 6 Clamp on to the electrode or ground rod to be measured Snap the jaws closed a few times for better accuracy 7 Read the value of ground resistance from LCD Note For better measurement 1 Snap the jaws closed a few times before powering on 2 Do not clamp on to any conductor at the moment of power up 3 Snap the jaws closed a few times after clamping on to ground electrode Note If self calibration does not stop 1 That is because the self calibration is not complete Ground tester will continue the process until a proper self calibration is done 2 Check the jaw mating surfaces If there is any dirt dust or foreign substance clean the surfaces 3 Do not open the jaws during self calibration Note Noise present in the electrode or ground rod If overly excessive current or 30V in ground rod exists the symbol NOISE will be displayed on the LCD In the presence of noise the reading is no longer accurate Note If jaw is open during measurement a symbol of OPEN will be displayed in LCD Re Re
7. 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 f 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 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 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 W button to increment decrement the value by 1 second As users hold the button longer the speed of incrementing decrementing will become faster The value can be incremented decremented from 0 to 255 255 to 0 seconds Value will roll over when the value of maximum 255 minimum 0 seconds is reached 4 Press the FUNC button several times until the upper row LCD show no letters 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
8. igure If R R are combined as Reg then only Ra are left in the circuit refer to Figure Ifa constant voltage is applied to the circuit the following equation will be derived I where Req i 1 25 7 n LR If A and R are about the same is a large number such as 200 then R will be much less than R and maybe approach Zero Rg gt gt Req 70 Example If and R are all 10 respectively and 200 Then Ra by calculation equals 1 Reg 10099 10 10 10 X Z Ro Reo 10 0 05 10 05 gt Rg 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 12 Figure Ral Ra Re 13 FigureB ELECTRICAL SPECIFICATIONS Ground Resistance Auto range Range Accuracy of Reading 0 025 0 250 0 002 Q 1 5 0 05 Q 0 250 1 000 1 5 0 05 Q 1 001 9 999 0 1592010 10 00 50 00 2 0 0 3 Q 2 0 05 0 3 0 100 Loop resistance noninductive external field lt 50 A m external electrical field lt 1 V m conductor centered 2Resistance Measurement Frequency 3 333KHz High and Low Alarm
9. 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 0 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 10 5 6 Read the Data Stored in Memory 1 Press the FUNC button until the symbol NO appears in the LCD The current record number is shown in the upper row of LCD And the data is displayed in the lower row of LCD 2 Pressthe A or button to read the next previous data Ifthe user holds the A or button longer the record number will be incremented decremented faster The record number will roll over when the last first record is reached gt 5 7 Clear Data Memory Press and hold the REC button then turn the power on The letters will appear indicating the memory is cleared 5 8 Disabling Auto Power Off At power up the symbol is displayed in the LCD That means the unit will turn itself off in about 4 to 6 minutes To disable this function press and hold the FUNC button then turn the power on The AP symbol will no longer be displayed in the LCD PRINCIPLE OF OPERATION Below is a simplified typical ground distribution system Its equivalent 11 circuit is shown in F
10. tery Install a new battery Replace the cover of battery and secure the screws Ov INSTALLATION CAT POLLUTION DEGREE 2 16 LIMITED WARRANTY Congratulations Your new instrument has been quality crafted according to quality standards and contains quality components and workmanship It has been inspected for proper operation of all of its functions and tested by qualified factory technicians according to the long established standards of our company Your instrument has a limited warranty against defective materials and or workmanship for one year from the date of purchase provided that in the opinion of the factory the instrument has not been tampered with or taken apart Should your instrument fail due to defective materials and or workmanship during this one year period a no charge repair or replacement will be made to the original purchaser Please have your dated bill of sale which must identify the instrument model number and serial number and call the number listed below Repair Department Amprobe TIF Promax Miramar FL 33025 Phone 954 499 5400 Toll Free 800 327 5060 Fax 954 499 5418 Website www Amprobe com Please obtain an RMA number before returning product for repair Outside the U S A the local representative will assist you Above limited warranty covers repair and replacement of
11. ton to select function of HI hi alarm LO low alarm SEC seconds or no read BAND IV LCD DISPLAY 10 9 11 1 Function 2 Digits 3 Ohm 4 5 Nn 6 NOISE 7 Jaw Open 8 Low Battery 9 NO 10 REC 11 AP o A Display current selected function or current record number Display value from 0 to 9999 with decimal point Symbol will be shown in Q and alarm functions Display ground leakage current in mA or A This symbol will be shown if the rotary switch is set at the alarm position When ground resistance tester senses noise in the ground electrode or ground rod this symbol will be shown in LCD When the jaw is open during measurement this symbol and the word OPEN will be shown in LCD When the battery voltage is lower than required this symbol will be shown in LCD Indicate the READ function Indicate data logging is in progress If this symbol is displayed in LCD that means the unit will be turned off in 4 to 6 minutes V 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 2 Snap the jaws closed a few times to let the jaws sit on the best mating position 3 Turn the power on set the rotary switch at position Do not clamp on to any conductor or open the jaws at this
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