AEMC Model 3640

Ground Resistance Tester (Digital,3-Point)

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Model 3640 [Catalog No. 2114.92] Ground Resistance Tester (Digital, 3-Point)
Characteristics:
  • Fall-of-Potential method
  • Measures ground resistance (2- and 3-Point)
  • Autoranging: automatically selects the optimum range
  • Designed to reject high levels of noise and interference
  • Extremely simple to operate: connect – press – read
  • LED on faceplate informs operator of high input noise, high auxiliary rod resistance and fault connections
  • Battery powered
  • Rugged dustproof and rainproof field case
  • Color-coded terminals
  • May be used for continuity tests on bonding
Application:
  • The Ground Resistance Tester Model 3640 is a rugged, easy-to-use instrument ideal for maintenance crews performing numerous tests. The Model 3640 is designed to reject high levels of interference. It can be used under difficult conditions such as high stray currents that normally affect accuracy. The Model 3640 may be used to perform the following tests:
    • Three-point measurements for measuring resistance to ground of ground rods and grids. Three-point measurements are generally used when the electrode or grid is easily disconnected, if corrosion is suspected, or where ground faults are unlikely to occur.
    • Two-point tests for continuity on bonding or on pre-established grounds. This test is commonly performed in urban environments where proper auxiliary electrode placement may be obscured by confined real estate. Measurements are referenced against a good local ground conductor.
Product Description:
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space The Digital Ground Resistance Tester Model 3640 performs ground resistance measurement. This direct reading tester measures from 10mΩ to 1999Ω, and is auto-ranging, so it automatically seeks out the optimum measurement range. The Model 3640 is easy to use – simply connect the leads, press to measure, and read. The large LCD (nearly 3/4″ high) also indicates low battery status, overrange, and lead reversals.The Model 3640 comes with 3 color coded terminals to aid in easy hookup. Three LED indicators on the front panel continuously warn the user of measurement problems to ensure accurate and reliable tests.The Model 3640 is fuse protected up to 250VAC.
Ground Kits:
Model 3640 Kit – 150 ft. [Catalog No. 2135.13]Ground Resistance Tester Model 3640 Kit – 150 ft.Test Kit for 3-Point testing includes instrument, two 150 ft color-coded leads on spools (red and blue), one 30 ft lead (green), two 14.5″ T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measurer and carrying bag.Catalog #2135.13
Model 3640 Kit – 300 ft. [Catalog No. 2135.14]Ground Resistance Tester Model 3640 Kit – 300 ft.Test Kit for 4-Point testing includes instrument, two 300 ft color-coded leads on spools (red and blue), two 100 ft color-coded leads (green and black), four 14.5″ T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measurer and carrying bag.Catalog #2135.14
Model 3640 Kit – 500 ft. [Catalog No. 2135.15]Ground Resistance Tester Model 3640 Kit – 500 ft.Test Kit for 4-Point testing includes instrument, two 300 ft color-coded leads on spools (red and blue), two 100 ft color-coded leads (green and black), four 14.5″ T-shaped auxiliary ground electrodes, one set of five spaded lugs, 100 ft tape measurer and carrying bag.Catalog #2135.14
Accessories (Optional)
25Ω Calibration Checker Cat. #2130.59
Tape Measure (100 ft) Cat. #2130.60
Ground Tester Video/Workbook set Cat. #2130.64
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Specifications:
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ELECTRICAL Model 3640
Ground Resistance Auto ranging
Range 20Ω 200Ω 2000Ω
Measurement 0.00 to 19.99Ω 20.0 to 199.9Ω 200 to 1999Ω
Resolution 10mΩ 100mΩ
Open Voltage
≤42V peak
Resistance Measurement Frequency
128Hz square wave
Test Current 10mA 1mA 0.1mA
Accuracy ±2% of rdg ± 1ct ±2% of rdg ± 1ct ±3% of rdg ± 3cts
Auxilliary Electrode Influence
RangeCurrent CircuitVoltage Circuit 20Ω200Ω2000Ω 3kΩ30kΩ50kΩ 50kΩ50kΩ50kΩ
Interference Rejects high levels of interference voltage(DC, 50/60Hz, harmonics)DC voltage in series withX 20VAC voltage in series with Y 13V peak AC voltage in series with Z 32V peak
Response Time Approximately 6 seconds for a stabilized measurement
Withstanding Voltage 50VAC with spikes of 3000VAC or 1000VDC
Power Source Eight 1.5V “AA” batteries; Alkaline recommended; “LO BAT” indication on LCD
Battery Life 1800 15-second measurements (approximate)
Fuse Protection High breaking capacity 0.1A, >250V, 0.25 x 1.25″
General Specifications
Display 7-segment LCD,0.71″ (18mm) high (31/2 digit); 2000-counts;LCD also indicates overrange, test lead shorts and lead reversals
Connection Color-coded terminals accept spade lugs with min. gap of 6mm or standard 4mm banana jacks
LED Indication 3 LEDs indicate high input noise, high auxiliary rod resistance, open leads, blown fuse
Operating Temperature 14° to 131°F (-10° to 55°C), 0 to 90% RH
Storage Temperature -40° to 158°F (-40° to 70°C), 0 to 90% RH with batteries removed
Dimensions 8.7 x 5.4 x 5.9″ (220 x 136 x 150mm)
Weight 2.9 lbs (1.3kg)
Case Heavy-duty, ABS
Colors Case safety yellow; Front panel gray
SAFETY
Mechanical Shock IEC 68-2-27
Vibration Test IEC 68-2-6
Drop Test IEC 68-2-32
Dielectric Test 3kV, 50/60Hz, 1min. between four interconnected measuring terminals and any external metal ground
Environmental O-ring sealed against dust and water to IP50
Electrostatic IEC 801-2
Electromagnetic IEC 801-3
Electric Shock IEC 801-5
Safety Rating EN 61010-1, Cat. III, Pollution Degree 2, 24V
Agency Approval Emission: EN 50081-1
Immunity: EN 50082-1
Double Insulation Yes
CE Mark Yes
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