AEMC MODEL 4500
GROUND RESISTANCE TESTER

AEMC MODEL 4500
GROUND RESISTANCE TESTER
  • Features Fall-of-Potential method
  • Measures ground resistance (2- and 3-Point) and soil resistivity (4-Point)
  • Step voltage tests and touch potential measurements
  • Selectable: three test currents and five resistance ranges
  • Measures very low resistance on large grounding systems and grids
  • High test current also enables geological surveys
  • Large easy-to-read LCD
  • Display includes indicators for excess stray current, high stray voltage, high auxiliary rod resistance and fault connection
  • Rugged dustproof and rainproof field case
  • Can be used for continuity tests on bonding
  • Battery (rechargeable 110V/220V) powered or external 12VDC

The AEMC Digital Ground Resistance Tester Model 4500 is designed for measuring very low resistance on large grounding systems, such as ground grids and ground mats.
It rejects high levels of interference voltages at DC or 60Hz and its harmonics, and can be used under difficult conditions such as high stray currents or excessive auxiliary electrode resistance resistance without substantially affecting accuracy.
The Model 4500 has three selectable test current ranges (2, 10, 50mA) and five selectable resistance testing ranges (2., 20., 200., 2000. and 20k.). It is capable of direct readings with a resolution as low as 1m.. With such a wide resistance capability, the Model 4500 is capable of measuring the resistivities of soil and other materials from below 10mohm/cm to over 1Mohm/cm.
Power is supplied by a rechargeable 12V battery; the tester may also be operated from an external 12VDC supply. A battery charge indicator and low battery indicator appear on the LCD and a dual-voltage charging unit is built into the instrument. The heavy-duty, safety yellow case is dust and water resistant to ensure reliable field use. The cover may be detached while the meter is in use, if desired. Optional test kits are available for ground resistance and soil resistivity tests.

Applications:

  • Three-Point measurements of large grounding grids, counterpoises, ground mats and grounded equipments
  • Soil resistivity tests (4-Point measurement), commonly performed by utilities at proposed construction sites. Using soil resistivity analysis, the size and complexity of grounding system construction can be evaluated. The Ground Resistance Tester Model 4500 will measure the resistivity of epoxies, cement, ground enhancement materials and many other substances.
  • Step or touch potential levels unders true fault conditions can be determined by using the Model 4500 to inject a simulated low-level fault into the electrical system. When used in this fashion, the Model 4500 will display readings in volts per fault ampere.
  • Two-Point tests for continuity tests on bonding or pre-established grounds

Specifications: MODEL 4500
ELECTRICAL
Ranges:             2, 2, 200, 2000, 20kohms
Resolution:         1mohm, 10mohm, 0.1ohm, 1ohm, 10ohms
Resistance:         Measurement Frequency 128Hz square wave
Test Current:       2mA, 10mA, 50mA
Accuracy:           ±2% of Reading ± 1ct from 10% to 100% of range
Auxiliary Electrode Ry: 50k. on 20, 200, 2000 & 20kohm ranges; 5k. Resistance:         on 2ohm range Rz: 2mA range: 15kohms; 10mA
                    range: 3000ohms; 50mA range: 400ohms
Interference:       The unit is designed to reject high levels of
                    interference voltages at DC, or 50/60 Hz and
                    their harmonics
Noise Influence on Accuracy:    0.5% of range (max) to 20V peak
Charging Time:      14 hours typical
Charging Supply Voltage: Internally selectable 110/220V, 45 to 450Hz
Power Source:       Built-in rechargeable 12V, 2 Ah NiCD battery,
                    or external 12 VDC; low battery indication.
                    Battery can be recharged with built-in                     dual voltage charging unit: 93 to 123V or
                    187 to 253V (47 to 450Hz)
Battery Life:       Four hrs on 50mA test current (800 15 sec
                    measurements), Seven hrs on 2mA and 10mA test
                    currents (1500 150 sec. measurements)
Fuse Protection:    500Vrms measurement circuit

MECHANICAL
Display:            LCD, 0.71" (18mm) high (31/2 digit); 2000-count
Connection Terminals: accept spade lugs with min. gap of 6mm or
                    standard 4mm banana jacks
Operating Temperature: 14° to 122°F (-10° to 50°C)
Dimensions:         15.75 x 10.2 x 9.8" (400 x 260 x 250mm)
Weight:             14 lbs (6.5kg) approximate
Case:               Heavy-duty plastic, with detachable coverand                     carrying handle
Colors Case:        safety yellow; Front panel: brown
Dielectric Test:    2000Vrms, 50/60Hz between four interconnected
                    measuring terminals and any external metal
                    ground; 2000Vrms, 50/60Hz between line input
                    and measuring terminals on front panel
Environmental:      O-ring sealed faceplate against water and dust;
                    sealed cover when closed; IEC529, DIN 0470-T1

SAFETY
Rating: EN 61010
Double Insulation:  Yes
Impact Resistance Shock and vibration: to MIL-T-28800D class 3
CE Mark:            Yes


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