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AEMC 4500 20kohm 4 Point Ground Resistance Tester

Description

The 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 without substantially affecting accuracy.

Features

  • Measures soil resistivity (4-Point)
  • Measure ground resistance (2- and 3-Point) Fall-of-Potential Method
  • 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 and voltage, high auxiliary rod resistance and fault connection
  • Battery (rechargeable) powered or external 12VDC
  • Rugged dustproof and rainproof field case
  • Can be used for continuity tests on bonding
  • Includes power cord, 12V NiCD battery, hex key, spare fuse and user manual

AEMC 4500 Applications

  • Three-point measurement of large grounding grids, counterpoises, ground mats and grounded equipment.
  • 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 under true fault conditions can be deter- mined by using the Model 4500 to inject a simulated low-level fault into an 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 on pre-established grounds.

Specifications

ELECTRICAL

 

 

 

Ranges

2Ω

20Ω

200Ω

2000Ω

20kΩ

Resolution

1mΩ

10mΩ

0.1Ω

1Ω

10Ω

Resistance Measurement Frequency

 

128Hz square wave

Test Current

2mA, 10mA, 50mA

Accuracy

±2% of Reading ± 1ct from 10% to 100% of range

Auxiliary Electrode Resistance

Ry: 50kΩ on 20Ω, 200Ω, 2000Ω & 20kΩ ranges; 5kΩ on 2Ω range Rz: 2mA range: 15kΩ; 10mA range: 3000Ω; 50mA range: 400Ω

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

Power Source

Built-in rechargeable 12V, one Ah NiCD battery, or external 12 VDC; low battery indication.

Battery can be recharged with built-in dual voltage charging unit: 94 to 127V or 187 to 253V (47 to 450Hz)

Charging Time

14 hours typical

Charging Supply Voltage

Internally selectable 110/220V, 45 to 450Hz

Battery Life

Four hrs on 50mA test current (800 15 sec measurements),

Seven hrs on 2mA and 10mA test currents (1500 15 sec. measurements)

Fuse Protection

500Vrms measurement circuit

MECHANICAL

 

Display

7-segment 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 cover and carrying handle

Colors

Case: safety yellow; Front panel: brown

Dielectric Test

2000Vrms, 50/60Hz between 4 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 according to MIL-T-28800D class 3

CE Mark

Yes

Standards

CISPR
CISPR 11
CISPR 14 - 1
CISPR 14 - 2
CISPR 14 - 2
CISPR 16 - 1
CISPR 16 - 2
CISPR 16 - 3
CISPR 16 - 4
CISPR 22
CISPR 24
IEC
IEC/TR EN 61000 - 1 - 1
IEC/TR EN 61000 - 2 - 1
IEC/TR EN 61000 - 2 - 3
IEC EN 61000 - 3 - 2
IEC EN 61000 - 3 - 4
IEC/TC EN 61000 - 3 - 5
IEC EN 61000 - 4 - 2
IEC EN 61000 - 4 - 3
IEC EN 61000 - 4 - 4
IEC EN 61000 - 4 - 5
IEC EN 61000 - 4 - 6
IEC EN 61000 - 4 - 7
IEC EN 61000 - 4 - 8
IEC EN 61000 - 4 - 9
IEC EN 61000 - 4 - 11
European
EN 50 081 part 1
EN 50 081 part 2
EN 55 011
EN 55 013
EN 55 014
EN 55 015
EN 55 020
EN 55 022
EN 55 024
EN 50 082 part 1
EN 50 082 part 2
EN 50 093
American
FCC Part 15
MIL-STD - 461E