Clamp-On Ground Resistance Tester Models 3711 & 3731 Measure down to 0.1 with resolution of 0.01 Fast settling time (approximately one second) High immunity to electrical noise for work around transmission towers and substations Extended battery life over 1000 tests (Auto-Off) Rugged jaw construction withstands heavy outdoor usage Smooth jaw matting surfaces easily cleaned to maintain reading accordingly US Patent Number 362,639 Features Simple and fast clamp-on operation -- no leads, no auxiliary rods or spacing requirements D irect reading of ground resistance from 0.1 to 1200 D irect reading of continuity and ground loop resistance D irect reading of ground leakage or phase current from 1mA to 30Arms J aw design with large 1.25" (32mm) window -- accommodates up to 1000kcmil cables Auto-Off for power management A larm function with adjustable set point and buzzer for quick field checks (Model 3731) Model 3731 performing a ground rod resistance check. The Models 3711 and 3731 measure ground rod and grid resistance in any environment without the use of auxiliary ground rods. Clamp-on ground resistance testers are used on multi-grounded systems without disconnecting the ground under test. The Models 3711 and 3731 simply clamp around the ground conductor or rod and measures the resistance to ground fast and accurately. Memory function to store 99 field measurements for later retrieval and analysis (Model 3731) Meets EN 61010, Cat. III CE Mark and UL approved and double insulated By performing measurements on installed ground systems, the user also verifies the quality of the grounding connections and bonds. Resistance and continuity of grounding loops around pads and buildings may also be measured. Rugged Lexan(R) head and body construction resists breakage Instrument's alarm settings and stored memory information saved during shutdown (Model 3731) Both models include a current measurement function. The probe's high sensitivity enables measurement of leakage current flowing to ground or circulating in ground loops down to 1mA as well as neutral and phase currents to 30Arms. This feature provides additional information, which is vital in distribution ground networks carrying higher levels of noise and harmonics, that affect power quality. Patented design The Model 3731 offers an alarm function and a memory (logging) function. In the alarm mode, the probe will audibly and visually indicate readings beyond set point. The user may also have the alarm initiated above or below the set point. This alarm feature permits quick field checks where "pass" or "fail" readings will suffice. Applications www.aemc.com Ohms Range Arms Range Hold Function Self Test Auto-Off Battery Life Indicator Noise Indicator Measure electrical ground rod and grid resistance Use on multi-grounded systems without disconnecting the ground rod under test Measure resistance and continuity of grounding loops around pads and buildings Measure leakage current flowing to ground or circulating in ground systems Conduct field surveys and retrieve and analyze readings at a later time Use on cell towers and telecommunication sites Use on pools, spas and other consumer installations 2 Functions & Features Open Jaw Indicator Closed Loop Indicator Multi-Tone Beeper Alarm Function Memory (Logging) Technical Assistance (800) 343-1391 3711 3731 3 3 3 3 3 3 3 3 3 3 - - 3 3 3 3 3 3 3 3 3 3 3 3 Construction Overview of Functions The Models 3711 and 3731 bodies are built of Lexan(R) (or equivalent olycarbonate) for rugged use. The probe heads are encapsulated in a p double-walled shell for extra strength and reinforced for enhanced field reliability. Overall construction and mechanical design ratings such as drop test, shock, vibration and weatherproofing against water penetration or dust, meet or exceed IEC standards. These products have also been designed to EN 61010, Cat. III and are UL approved and are CE Marked. The probe head, (jaw) is a key component in the measurement and overall product performance. The large jaw thickness permits use on tight ground conductors on poles and in manholes. The 1.25"(32mm) opening accommodates not only ground rods, but also larger ground conductors (up to 1000kcmil) typically found in telecommunication buildings or railroad applications. The inner jaw is composed of two independent and individually shielded magnetic cores, permitting measurement without noise interference or cross talk common to instruments with separate probes. Thorough mechanical design, including small winglets, ensures reliable and repetitive jaw alignment for accuracy and prevents undesirable contaminations into the jaw spring assembly. The smooth head surfaces eliminate the build up of foreign particles that cause errors in reading. Displayed when measuring resistance mA, A Displayed when measuring current Percentage of battery life remaining + - Indicates the Auto-Off feature is inactive Indicates Alarm Active Hi or Lo depending on which arrow is displayed HOLD HOLD pushbutton has been pressed Active beeper function NOISE Noise in the reading Probe jaws not closed properly CE requirements and design minimize electromagnetic interference near substations and tower sites. The ergonomic body design permits one-handed operation. The guard provides additional strength, and prevents the hand from slipping or coming into contact with conductors under test. The LCD lens cover may be easily replaced if scratched. The sealed push-buttons directly access all test functions and are easily operated even with gloved hands. Head assembly Flashing indicates low battery condition Alarm set points MEM Memory function active Memory Recall (MR) and location (from 1 to 99) . Resistance measured is below .1 Buttons s On/Off Power ON or power OFF. Activates display self test at power-up. ( ) Resistance measurement. (Adjusts the alarm set point and the memory position when in programming mode.) Lever for jaw opening/closing Memory button AL button to Current activate/deactivate measurement the alarm function button Technical Assistance (800) 343-1391 Hold button 000-count 3 liquid crystal display ON/OFF button Resistance measurement button A( ) Current measurement. (Adjusts the alarm set point and the memory position when in programming mode.) s The smooth head surface eliminates build up of foreign particles and improves reading accuracy. AL (Model 3731 only) Activate/deactivate the alarm function. Access the value of the alarm set point when in programming mode. MEM (Model 3731 only) Activate the memory function or to read the stored values in MR (Memory Recall). Clears the memory when in programming mode. www.aemc.com 3 Specifications ModelS Electrical Ground Resistance Ranges Auto-Ranging 0.01 to 1200 Current Measurement Ranges Auto-Ranging 1mA to 30.00Arms Resistance Measurement Frequency Current Measurement Frequency Current Overload Power Source Battery Life Mechanical Dimensions Weight Jaw Window Diameter Jaw Opening U.S. Patent UL File No. Display LCD Environmental Operating Temperature Operating Humidity Storage Temperature Safety Safety Rating Double Insulation CE Mark 3711 & 3731 Measurement RangeResolutionAccuracy (% of Reading) 0.10 to 1.00 0.01 (2% 0.02) 1.0 to 50.0 0.1 (1.5% 0.1) 50.0 to 100.0 00.5 (2% 0.5) 100 to 200 01 (3% 1) 200 to 400 05 (6% 5) 400 to 600 010 (10% 10) 600 to 1200 050 Approx: 25% 50 Measurement Range ResolutionAccuracy (% of Reading) 1 to 299mA 1mA (2.5% + 2mA) 0.300 to 2.999A 0.001A (2.5% + 2mA) 3.00 to 29.99A 0.01A (2.5% + 20mA) 2403Hz 47 to 800Hz OL displayed above 29.99Arms 9V Alkaline battery (IEC 6LF22 or NEDA 1604A) Typical: 8 hours or approx. 1000 measurements of 30 seconds 9.25 x 3.94 x 2.17" (235 x 100 x 55mm) 2.2 lbs (1kg) 1.25" (32mm) 1.38" (35mm) No. 362,639 E192383 33/4 Digit, 1.73 x 1.10" (44 x 28mm) 14 to 131F (-10 to 55C) 10 to 90% RH @ 14 to 104F (-10 to 40C), 75% RH @ 131F (55C) -22 to 158F (-30 to 70C) EN 61010-2-032 (Class 2) Double Insulation Yes Yes Clamp-On Ground Resistance Tester Models 3711 & 3731 include a calibration loop, battery and user manual in a hard carrying case. Calibration Check Loop (included) ORDERING INFORMATION CATALOG NO. Ground Resistance Tester Model 3711 (Clamp-On) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2117.60 Includes 9V Alkaline battery, 25 calibration check loop, hard carrying case and user manual Ground Resistance Tester Model 3731 (Clamp-On) with memory and alarm. . . . . . . . . . . . . . . . . . . . . . . . . . . . Cat. #2117.61 Includes 9V Alkaline battery, 25 calibration check loop, hard carrying case and user manual Call the AEMC(R) Instruments Technical Assistance Hotline for immediate consultation with an applications engineer:(800) 343-1391 Chauvin Arnoux(R), Inc. d.b.a AEMC(R) Instruments * 200 Foxborough Blvd. * Foxborough, MA 02035 USA * (800) 343-1391 * (508) 698-2115 * Fax (508) 698-2118 Visit our website at www.aemc.com 950.BR-3711-31_0210Rev 04 . Printed in the USA