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Summary of Contents for AEMC instruments Clamp-On 3705
- Page 1 Clamp-On Ground Resistance Tester Model 3705 USER MANUAL 150V CAT III HOLD Model 3705 GROUND TESTER I N S T R U M E N T S HOLD NOISE –...
- Page 2 Limited Warranty The Model 3705 is warranted to the owner for a period of two years from the date of original purchase against defects in manufacture. This limited ® Instruments, not by the distributor from whom warranty is given by AEMC it was purchased.
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Page 3: Table Of Contents
Table of Contents Warning .....................4 International Electrical Symbols ..............4 Receiving Your Shipment................5 Packaging....................5 Accessories ....................5 Important Information - Proper Operation ..........5 Description ....................5 Product Construction ................6 Jaw Design ....................6 Body Design ..................6 Electrical Specifications ................7 Ground Resistance................7 Mechanical Specifications.................7 Safety Specifications.................8 Model 3705 Controls .................9 Digital Display Features ................10 Function Controls ..................12... - Page 4 Phone Pedestal ...................22 Above Telephone Space ..............24 General Measurement Notes ..............24 Calibration Check Loop................25 Commonly Asked Questions..............26 Maintenance....................27 Warning ....................27 Battery Replacement Procedure ............28 Troubleshooting ..................28 Repair and Calibration ................29 Technical and Sales Assistance .............29...
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Page 5: Warning
Ground Resistance Tester Models 3705 Warning These safety warnings are provided to ensure the safety of personnel and proper operation of the instrument. • The instrument must not be operated beyond its specified operating range. • Safety is the responsibility of the operator. •... -
Page 6: Receiving Your Shipment
Ground Resistance Tester Models 3705 Receiving Your Shipment Upon receiving your shipment, be sure that the contents are consistent with the packing list. Notify your distributor of any missing items. If the equipment appears to be damaged, file a claim immediately with the carrier and notify your distributor at once, describing any damage. -
Page 7: Product Construction
Ground Resistance Tester Models 3705 Product Construction ® The Model 3705 body case is built of Lexan for rugged use. The probe ® heads are encapsulated in a double-walled Lexan shell (or equivalent polycarbonate) for extra strength and are reinforced at the body interfaces for enhanced field reliability. -
Page 8: Electrical Specifications
Ground Resistance Tester Models 3705 Electrical Specifications Ground Resistance Measurement Range Range Resolution Accuracy* 0.1 to 1.00Ω 0.01Ω ± (2% R ± 0.02Ω) 1.0 to 50.0Ω 0.1Ω ± (1.5% R ± 0.1Ω) 50.0 to 100.0Ω 0.5Ω ± (2.0% R ± 0.5Ω) Autoranging 100 to 200Ω... -
Page 9: Safety Specifications
Ground Resistance Tester Models 3705 Storage Temperature: -22° to 158°F (-30° to 70°C) Altitude: Operational - 2000m; Storage - 12000m Power Supply: 9V Alkaline (IEC 6LF22 or NEDA 1604A) Battery Life: Typical: 8 hours or approx. 1000 measurements of 30 seconds LCD: 3-3/4 digit, 1.73 x 1.10”... -
Page 10: Model 3705 Controls
Ground Resistance Tester Models 3705 Model 3705 Controls 150V CAT III HOLD Model 3705 GROUND TESTER I N S T R U M E N T S HOLD NOISE – Figure 1 1. Head Assembly: Consists of 4. ON/OFF: Power ON or OFF, two individually shielded activates display self-test at magnetic cores. -
Page 11: Digital Display Features
Ground Resistance Tester Models 3705 Digital Display Features NOISE R .1 HOLD – Figure 2 Displayed when the beeper is active. To turn the beeper On/Off, push ON & Ω together at power-up. The beeper is active when displayed. Displayed when the HOLD function is activated. This function locks the present displayed value. - Page 12 Ground Resistance Tester Models 3705 Indicates the Auto-Off feature is deactivated and the instrument stays on permanently (until turned off by the user). With no symbol displayed, after 5 minutes of non-use the instrument will automatically shut itself off. The Auto-Off feature is turned On/Off by pressing Hold at power-up.
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Page 13: Function Controls
Ground Resistance Tester Models 3705 Function Controls On/Off The ON/OFF push-button, when pushed actuates power on or power off with an audible control tone. Upon initial power-up, the instrument will be in the Ohms function (Ω) and will go to OL until clamped on. When the ON push-button is pushed and held down, after three seconds the instrument will beep and provide a self test featuring a full function display (Fig. -
Page 14: Auto-Off
Ground Resistance Tester Models 3705 Auto-Off The instrument will shut off automatically after ® Model 3705 five minutes of non-use. The instrument will GROUND TESTER I N S T R U M E N T S issue a short beep 15 seconds prior to shutting down and the LCD flashes once per second. -
Page 15: Resistance
Ground Resistance Tester Models 3705 Resistance The Ω function provides resistance measurements from 0.1 to 1200Ω in seven autoranges. Range Resolution 0.07 to 1Ω 0.01Ω 1.0 to 50.0Ω 0.1Ω 50 to 100Ω 0.5Ω 100 to 200Ω 1Ω 200 to 400Ω 5Ω... -
Page 16: Function Access Summary
Ground Resistance Tester Models 3705 Function Access Summary Push Button(s) Function Setting Function Used Saved @ Power Down On/Off ON/OFF Ω Function ON/OFF Default Setting Display Hold HOLD Auto-Off On/Off ON + HOLD Principle of Operation Typically grounded distribution system may be simulated by the basic circuit shown in Fig. - Page 17 Ground Resistance Tester Models 3705 Figure 9 Figure 10 - 16 -...
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Page 18: Field Applications
Ground Resistance Tester Models 3705 Field Applications Pole Ground Rods Remove any molding covering the ground conductor, and provide sufficient room for the jaws of the clamp-on. The jaws must be able to close easily around the conductor. The jaws can be placed around the ground rod itself. -
Page 19: Service Entrance Or Meter
Ground Resistance Tester Models 3705 Note: A high reading or OL indicates one or more of the following: A. Poor ground rod B. Open ground conductor C. High resistance bonds on the rod or splices on the conductor; watch for buried split butts, clamps, and hammer-on connections. Service Entrance or Meter Follow the same procedure as for Pole Ground Rods. -
Page 20: Pad Mounted Transformer
Ground Resistance Tester Models 3705 Pad Mounted Transformer Observe all safety requirements - High voltage may be present! Locate and number all rods (usually only a single rod is present). If the ground rods are inside the enclosure, refer to Fig. 14 and if they are outside the enclosure, refer to Fig. -
Page 21: Transmission Towers
Ground Resistance Tester Models 3705 Transmission Towers Observe all safety requirements - Dangerously high voltage may be present! Locate the ground conductor at the base of the tower. Many different configurations exist. Care should be taken when searching for the ground conductor. -
Page 22: Service Panel
Ground Resistance Tester Models 3705 Service Panel If we clamp-on the grounding electrode conductor in Fig. 17, the multi- grounded system required to complete the circuit may be from different sources. These sources may include the following: Electric Neutral, Phone, CATV, and Water. The Electric Utility Neutral should be the principle conductor of the low- impedance signal return path required to test the resistance of this ground electrode with the Model 3705. -
Page 23: Phone Pedestal
Ground Resistance Tester Models 3705 Phone Pedestal Provide sufficient room for the Model 3705 jaws, which must be able to close easily around the conductor (Fig. 18). The jaws can be placed around the ground rod itself. Note: If not enough room is available for this task refer to Fig. 19 and continue with this example. - Page 24 Ground Resistance Tester Models 3705 Phone Pedestal round Bar Sheath Connection round level round Figure 18 Phone 1. Remove ground bar Pedestal connection to pedestal rod 2. Extend pedestal rod lead to the ground bar using a temporary jumper round Bar Sheath Connection round level round...
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Page 25: Above Telephone Space
Ground Resistance Tester Models 3705 Above Telephone Space The reading you measure with the 3705 indicates the bonding connections between the Tele- phone ground and the Power company ground. One of the following two scenarios should be observed: A. If “OL” or a high resistance taples reading displayed this... -
Page 26: Calibration Check Loop
Ground Resistance Tester Models 3705 Calibration Check Loop The calibration loop of 25Ω (Fig. 26) is provided to perform a quick check of the instruments. Check the clamp-on ground resistance tester by clamping around the loop; the 3705 should read between 24.2Ω and 25.8Ω. -
Page 27: Commonly Asked Questions
Ground Resistance Tester Models 3705 Commonly Asked Questions for Clamp-on Ground Resistance Measurements Q. Can the Clamp-on method be used effectively on high tension towers despite the distance or spacing between them? A. Yes. Extended distances will not adversely effect the measurement results. -
Page 28: Maintenance
Ground Resistance Tester Models 3705 Q. Can the clamp-on method be used for substation grid resistance testing? A. It depends. It can be used as long as the instrument can be clamped onto a point on the grounding system at a common point where it ties to the system neutral. -
Page 29: Battery Replacement Procedure
Ground Resistance Tester Models 3705 Battery Replacement Procedure The Clamp-On Ground Resistance Tester is powered by a single 9V battery. The battery replacement indicator will display continuously when battery replacement is required. Recommended replacement type is Alkaline (IEC 6LF22, 6LR61 or NEDA 1604A). -
Page 30: Repair And Calibration
Ground Resistance Tester Models 3705 Repair and Calibration To ensure that your instrument meets factory specifications, we recommend that it be submitted to our factory Service Center at one-year intervals for recalibration, or as required by other standards or internal procedures. For instrument repair and calibration: You must contact our Service Center for a Customer Service Authorization number (CSA#). - Page 31 ® ® Chauvin Arnoux , Inc. d.b.a AEMC Instruments 15 Faraday Drive • Dover, NH 03820 USA www.aemc.com 99-MAN 100260 v2 08/18...
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