User Manual

Model 4500 (pdf) Rev. 04 11/04
Technical Assistance [phone] www.aemc.com 2 of 5
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 Ry: 50kΩ on 20Ω, 200Ω, 2000Ω & 20kΩ ranges; 5kΩ on 2Ω range
Resistance 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
0.5% of range (max) to 20V peak
on Accuracy
Power Source Built-in rechargeable 12V, one Ah NiCD battery, or external 12 V
DC; 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 (3
1
/
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
Features
• Measures soil resistivvity (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 12V
DC
• 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
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 eval-
uated. The Ground Resistance Tester
Model 4500 will measure the resis-
tivity 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.