AEMC 6472 2135.51 Multi-Function Ground Resistance Tester

The AEMC 6472 Multi-Function Ground Resistance Tester is a portable measurement instrument engineered to measure bond resistance, soil resistivity, ground resistance (with and without clamps), step and touch potential, and earth coupling.

When used in conjunction with the GroundFlex Adapter 6474 (exclusively a factory supplied product), Power Transmission Tower and Tower Leg Ground Resistance testing is also available.

The Model 6472 can measure from 0.01 to 99.99k Ohms and is auto ranging, automatically finding the best measurement range, test current and frequency. The adjustable test frequency (whether set manually or automatically) from 40 to 5078 Hertz test voltage provides rejection of high levels of interference, enabling it to be operated under difficult conditions such as the presence of high stray currents that normally affect accuracy.

Up to a maximum of 512 test results can be stored using internal memory for later review to the display or download to a PC using the included DataView software for Frequency/Resistance Plots, Automatic Fall-of-Potential Plot Generation, Automatic Report Generation, and much more.

6472 Features

4 Pole (4 Point) Fall of Potential measurement for extremely low resistance measurements with automatic or manual frequency selection and automatic lead compensation
3 Point Fall of Potential measurement
3 Point earth coupling measurement
Manual or automatic frequency scan from 40 to 513 Hertz for test accuracy in electrically noisy environments
Earth coupling testing
Selectable test voltage 16 or 32 Volts up to 250 milliAmp test current
4 Point soil resistivity measurement with automatic calculation of Rho and user selection of Schlumberger or Wenner test method
2 and 4 Wire DC resistance measurement (Bond testing) with automatic polarity reversal
Ground Resistance with 2 clamps - no auxiliary rods
Ground Resistance of Pylons with the GroundFlex Adapter 6474 and GroundFlex sensors allow the system to measure leakage current and ground resistance of tower legs without disconnecting the overhead ground conductor
DataView software for analysis, real time display, data storage, system configuration, and report generation
Auto off power management
Automatic recognition of all electrode connections and their resistance value
Stores a maximum of 512 complete test results
Optically isolated USB communication
Rechargeable NiMH batteries from AC charger or vehicle charger
Rugged rainproof and dustproof field

Applications

3 Point measurements of resistance to ground of grids and ground rods. 3 Point measurements are used when electrode or grid can be easily disconnected
4 Point tests or soil resistivity measurements. Locating areas of lowest soil resistivity is essential for achieving a feasible grounding installation
Touch and step potential testing measurements. These tests are best where ground faults are highly likely to occur, when the ground cannot be disconnected, or when the “footprint” of grounded equipment (the outline of the part of equipment in contact with earth) is comparable to the size of the ground to be tested
2 or 4 Wire tests for continuity tests on bonding or on grounding systems. Test is a DC resistive test using 250 mA or more and is used to check bonding of all connection points on the ground system
Earth coupling measurement and display. Used to estimate the influence of two earth resistance systems that are not connected to each other

Specifications
ELECTRICAL
3-Pole Measurement
Range (Auto-Ranging)	0.09 to 99.9k Ohms
Resolution	0.01 to 100 Ohms
Test Voltage / Current	Nominal 16 or 32 Volts RMS user selectable; Up to 250 milliAmps
Resistance Measurement Frequency	41 to 5078 Hertz user selectable or automatic selection
Accuracy	±2 percent of Reading + 1ct at 128 Hertz
Earth Coupling Measurement	Yes
4-Pole Measurement
Range (Auto-Ranging)	0.001 to 99.99k Ohms
Resolution	0.001 to 10 Ohms
Test Voltage	16 or 32 Volts user selectable
Resistance Measurement Frequency	From 41 to 5078 Hertz selectable
Accuracy	±2 percent of Reading + 1cts at 128 Hertz
NOTE	4 Pole Measurement with 1 Clamp SR182 (same specification as the 4 Pole measurement) 4 Pole Measurement with 1 Clamp MN182 (same specification as the 4 Pole measurement + 5 percent)
2 Clamp Measurement
Range (Auto-Ranging)	0.01 to 500 Ohms
Resolution	0.01 to 1 Ohms
Frequency	128, 1367, 1611, 1758 Hertz
Accuracy with SR182	±10 percent of Reading + 1cts
Accuracy with MN182	±20 percent of Reading + 2cts
Soil Resistivity 4 Pole Measurement
Test Method	Wenner or Schlumberger selectable with automatic calculation of test results in Ohm-meters, Ohm-cm or Ohm-feet
Range (Auto-Ranging)	0.01 to 99.99k ohms; P Max: 999kOhmsm (display in kOhmft is not possible)
Resolution	0.01 to 100 Ohms
Test Voltage	16 or 32 Volts user selectable
Frequency	From 41 to 128 Hertz selectable
Accuracy	±2 percent of Reading + 1cts
Earth Potential Measurement
Range (Auto-Ranging)	0.01 mV to 65 Volt
Resolution	0.01 to 10 mV
Accuracy	±2 percent of Reading + 1ct at 128 Hertz
Frequency	From 41 to 128 Hertz selectable
Accuracy	2 percent of Reading + 1cts
External Voltage Measurement
Range (Auto-Ranging)	0.1 to 65.0 Volts AC/DC – DC to 440 Hertz
Accuracy	±2 percent of Reading + 1cts
Input Impedance	1.2M Ohms
External Current Measurement
Range (Auto-Ranging) with SR182	0.01 to 40.0 Amps – 16 to 400 Hertz
Accuracy at 50 to 99Hz	±5 percent of Reading + 2cts from 0.01 to 100mA; ±10 percent + 2cts from 0.1 to 40A
Range (Auto-Ranging) with MN182	0.01 to 9.99A – 16 to 400 Hertz
Accuracy at 50 to 99Hz	±7 percent of Reading + 2cts from 0.01 to 100mA; ±15 percent + 2ctsfrom 0.1 to 10A
Resistance Measurement (Bond Testing) IEC 61557/4
Measurement Type	2 Pole (with lead resistance compensation) or 4 Pole (Kelv