The Digital Ground Resistance Tester Model
4620 performs ground resistance and soil resistivity tests.
This direct
reading testers measures from 0 to 2000Ω, and is auto-ranging, so it
automatically seeks outs the optimum measurement range.
The Model 4620
is rugged, easy-to-use and is ideal for maintenance crews performing
numerous tests. It exceeds mechanical and safety specifications for
shock, vibration and drop tests called out in IEC standards.
It is
designed to reject high levels of interference, so it can be used under
difficult conditions such as high stray currents that normally affect
accuracy.
Model
4620 Kit
Catalog# 2114.95
The
Model 4620 is also available in complete kit form, which includes the
meter, 8 C batteries, two 300 ft color-coded leads on spools, two 100 ft
color-coded leads, four 16" auxiliary ground electrodes, one 16 ft
lead with Mueller clip, carrying bag, one 100 ft tape measure, one AC
power cord, ground workbook and user manual
Three-Point measurements of resistance to ground of ground rods and grids.
Three-Point measurements are generally used when the electrode or grid can
be easily disconnected, if corrosion is suspected, or in circumstances where
ground faults are unlikely to occur
Four-Point tests or soil resistivity measurements. Locating areas of
lowest soil resistivity is essential for achieving an economical grounding
installation
Touch potential measurements, an alternative to 3-Point tests in
evaluating electrical safety. This test is recommended when the ground
cannot be disconnected, where ground faults are highly likely to occur, or
when the "footprint" of grounded equipment is comparable to the
size of the ground to be tested.
Rejects
high levels of interference voltage (DC, 50 to 60Hz, harmonics): DC
voltage in series with X: 20V; AC voltage in series with Y: 13V peak; AC
voltage in series with Z: 32V peak
Response
Time:
Approximately
6 seconds for a stabilized measurement
Voltage
Withstand:
250VAC
with spikes of 3000VAC or 1000VDC
Power
Source:
Eight C cell
batteries
Battery
Life:
1800
15-second measurements
Fuse
Protection:
0.1A,
250v, 0.25 X 1.25"; 30kA Interrupt Capacity
Mechanical Specifications
Display:
3-1/2,
0.71" (18mm) high; 2000-count; electroluminescent
blue backlight - LCD also indicates overrange, test lead
shorts and lead reversals
Connection:
Color-coded
terminals accept lugs with min. gap of 6mm or standard 4mm
banana jacks
LED
Indication:
Three
LEDs indicate high input noise, high auxiliary rod
resistance, open leads, blown fuse
Operating
Temperature:
14°
to 131°F (-10° to 55°C), 20 to 90% RH
Storage
Temperature:
-40°
to 158° F (-40 to 70° C), 0 to 90% RH with batteries
removed
Dimensions:
9.45
x 7.28 x 4.33" (240 x 185 x 110mm)
Weight:
7.75
lbs (3.5kg)
Case:
Heavy
duty o-ring sealed field case
Colors:
Case:
safety yellow; Front panel: gray
Mechanical
Shock:
IEC
68-2-27
Vibration
Test:
IEC
68-2-6
Drop
Test:
IEC
68-2-32
Dielectric
Test:
3kV,
50/60Hz, 1 min. between four interconnected measuring
terminals and any external metal ground
Environmental:
O-ring
sealed against dust and water to IP50 (Protection Index)
