GroundFlex
®
Field Kit
Reliable,
accurate and quick
Tower Ground Resistance Testing System
Models 6472 & 6474
99 Washington Street
Melrose, MA 02176
Phone 781-665-1400
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com
comprehensive
ground resistance
testing
Multi-function
►
Ground resistance measurements
on towers (with 6474 option)
►
Ground resistivity (Wenner and
Schlumberger methods)
►
Multi-point ground testing
►
Earth coupling
►
Ground potential measurement
►
Continuity / Resistance
measurements
►
Step and Touch Potential
High Performance
►
Analyze the impedance behavior
of grounding systems at
frequencies between 41Hz to 5kHz
►
Wide measurement range for
optimum resolution
►
Rejection of interference voltages
up to 60Vpeak
►
Automatic calculation of the
ground coupling coefficient and
ground resistivity
►
Measurement and analysis of
tower leg grounding
►
Analyze the quality of the
overhead ground conductor
or bonding to the tower
►
Recording of results
►
Measures leakage current
►
Measures stray voltage
IP
53
Rated
cover closed
Our products are backed by over 100 years of experience in test and measurement
equipment, and encompass the latest international standards for quality and safety.
Now you can test energized Tower Systems
Transmitting electricity safely and efficiently to meet demands of millions of consumers can be daunting.
Getting the right “tools” to test transmission towers’ ground systems should NOT be.
The Model 6472 with companion Model 6474 GroundFlex® Adapter
unit comprise a powerful high end ground resistance testing system.
This new and innovative system provides a cost effective
method of accurately measuring the grounding resistance
of power transmission, cellular, windmills and other
towers without disconnecting or isolating the tower
from other structures. This feature alone will save
enough time and money to pay for itself in just
a few months.
Flexible
sensors measure
leakage current
down tower legs
Any tower with one to four legs can be tested. Measuring the current flow allows calculating the resistance of each leg and the total resistance to ground by
measuring the leakage current through each leg. Flexible sensors wrapped around each leg of the tower provide an accurate high sensitivity measurement
capable of determining values that other measuring techniques cannot. The quality of the overhead ground conductor can also be determined. This system
can also measure all traditional ground testing measurements including three or four pole fall-of-potential, four pole soil resistivity, bonding and earth
coupling. Tests can be conducted at selected frequencies from 41 to 5078Hz or swept across the full frequency range, ideal for profiling impedance needed
to analyze the effects of a potential lightning strike. The system includes all necessary sensors, wires and reels, auxiliary electrodes and cables.
Up to 512 complete measurements can be stored in internal memory for later downloading to a PC for analysis and report generation using the full featured
DataView
travel case which also serves as a field work station. The system can operate on batteries, AC power or 12 volt DC, and even while being charged.
®
software. Each instrument in the system is built into a rugged water resistant polycarbonate case. The full kit is additionally packaged in a field
HOW IT WORKS
Models 6472 & 6474
Ground measurement on towers with overhead ground cable
High voltage lines are usually equipped with an overhead ground conductor to provide a neutral path and to allow lightning
discharge to ground through the tower structure. Since the towers are all connected to this conductor, all the towers’ resistances
are in parallel. This means it is impossible to measure resistance of individual towers using traditional 3-Point methods unless the
overhead ground conductor cable is disconnected. This is a dangerous, time-consuming and expensive operation.
Current
injection
rod
R
H
H
S
ES
E
HOW TO:
Test a tower ground system
using Models 6472 & 6474
Overhead
ground conductor
High voltage
line
6472
4
3
1
2
1
2
3
4
4 AmpFlex
®
channels connected
MODEL 6472:
2 Clamp method
also sold as accessories (Cat. #2135.72)
Potential
measurement rod
R
S
Ground resistance measurement using 2 Clamp stakeless method
Given a system with parallel ground connections, the Model 6472 is capable of accurately measuring ground resistance using 2 clamps
only. The principle of this method involves placing 2 clamps around the ground conductor to be tested and connecting each to the
instrument. One clamp injects a known signal (typically 32V/1367Hz) while
the other clamp measures the current circulating in the loop. This method
saves considerable time when ground testing because it is no longer
necessary to set up auxiliary rods or to disconnect the ground connector.
No guess work.
The display indicates
which test lead
connections are needed
for the test selected.
6474
The connections are displayed, but flash
if incorrect or absent for the test selected.
FEATURES & KEY SPECIFICATIONS
3- and
4-Pole
Fall-of-
Potential
Measurement
with manual
or automatic
frequency
selection
4-Point Soil
Resistivity
Measurement
with automatic
calculation
of Rho (
and user
selection of
the Wenner or
Schlumberger
test method
ELECTRICAL
Range (Auto-Ranging)
Resolution
Accuracy
No-Load Voltage
Measurement
Frequency
Coupling Measurement
Auxiliary Rod
Resistance Measurement
Voltage Interference
Soil Resistivity
Type of Measurement
Measurement Current
MECHANICAL
Memory / Communication
Dimensions/Weight
Protection
Electrical Safety
2- and
4-Wire DC
Resistance
Measurement
(Bond testing)
r)
with automatic
polarity
reversal
3-POINT
METHOD
0.01W to 99.9kW 0.001 to 99.99W 0.01 to 500W 0.01kW to 99.9W 0.01mV to 65.00V 0.001W to 99.9kW
3-Pole Fall-
of-Potential
and Earth
Coupling
Measurement
determines
the effect
that adjacent
grounding
systems have
on each other
4-POINT
SELECTIVE
METHOD
Automatic/
Manual
Frequency
Selection
Scan from
41 to 5078Hz
for optimum
test accuracy
in electrically
noisy
environments
EARTH
MEASUREMENT
WITH 2 CLAMPS
Selectable
Test Voltage
16 or 32V with
up to 250mA
of test current
SOIL
RESISTIVITY
Automatic
Recognition
All electrode
connections
and
measurement
of their
resistance
values
EARTH
POTENTIAL
MEASUREMENT
Determines
Bonding
Condition
Of overhead
ground
conductors and
tower legs to
the grounding
system
DC
RESISTANCE
MEASUREMENT
Auto
Power OFF
Saves
battery life
MEASUREMENTS
WITH MODEL 6474
0.001W to
99.99kW
2 wires:
0.01 to 100W 0.001 to 10W 0.01 to 1W 0.01 to 100W 0.01 to 10mV
0.01 to 100W/
4 wires:
0.001 to 10
0.001 to 10W
± (2% + 1ct) ± (2% + 1ct) ± (10% + 1ct) ± (2% + 1ct) ± (5% + 1ct) ± (2% + 2cts) ± (5% + 1ct)
16 or 32Vrms 16 or 32Vrms 16 or 32Vrms 16 or 32Vrms 16 or 32Vrms ± 16Vdc 16 or 32Vrms
Auto: 1367Hz
41 to 5078Hz 41 to 5078Hz
Manual: 1367Hz,
41 to 128Hz 41 to 128Hz DC 41 to 5078Hz
1611Hz, 1758Hz
Yes – – – – – –
0.1W to 100kW 0.01W to 100kW – – – – 0.01W to 100kW
Maximum 60Vpeak – Maximum 60Vpeak
– – –
Wenner and
Schlumberger
– – –
3 wire 4 wire – 4 wire 3 wire 2 wire or 4 wire GroundFlex
up to 250mA up to 250mA – – up to 250mA > 200mA DC up to 250mA
512-record memory / optical USB
10.7 x 9.84 x 5.04" (272 x 250 x 128mm) / Model 6472: 3.2 kg / Model 6474: 2.3 kg
IP53 (cover closed); UL94V0
50V CAT IV, complies with IEC 61326-1 / IEC 61010 / IEC 61557-1-4-5
W
®
IP
Rated
53
Optically
Isolated
USB
Protects
connected
computer
equipment
from potential
fault current
Remote
Set Up
Operation of all
measurements
and automatic
report
generation
using
®
software
DataView
Rechargeable
NiMH
Batteries
From wall
charger or
vehicle power
(can operate
while charging)
Rugged
Dustproof
and
Rainproof
Field case
IP53 rated in
closed position
Test active towers safely
WITHOUT disconnecting
the overhead ground
IEC 61010-1
IEC 61557-1
IEC 60529
IEC 61326-1
conductor
CONSTRUCTION
Input terminals
To injector electrode
or clamp
To potential electrode
or clamp
To ground measurement
point or clamp
To ground measurement point
USB
communications
port
Test
function
selection
switch
GroundFlex® sensors inputs
1
2
3
4
Interface cable
for connecting
the GroundFlex
Adapter Model
6474 to the 6472
Sensor
Turns
Selector
®
DC power input
Navigation
buttons
Start / Stop
test button
Function
buttons
Large, electroluminescent
backlit liquid crystal display
Sensitivity
Selector
Test Input Selector
Rotary Switches & Connections
Set-Up Position
For configuring all user programmable parameters.
GroundFlex® Measurement Position
Used to measure the ground resistance of tower legs without the need to remove the
overhead ground conductor (energized or de-energized). Also used to identify poor ground
connections of an individual tower leg and for bonding of the overhead ground conductor.
Two Clamp Position
Used for measuring ground resistance using two current clamps.
Eliminates the need for auxiliary rods.
V Potential Measurement Position
Similar use to the three pole test method. The results are displayed as variation from
reference in the test area selected – used for plotting potential variations in the test area.
Soil Resistivity Measurement Position
User selection of the Wenner or Schlumburger test methods with direct
readout W-Meters or W-Feet.
4 Pole Earth Resistance Measurement Position
Used for measuring very low ground resistances eliminating test lead resistance from the
measurement. Provides up to 10 times the sensitivity of the three pole method. Also used
for selective Fall-of-Potential measurement using one clamp to test multiple ground points.
3 Pole Earth Resistance Measurement Position
Used for traditional Fall-of-Potential testing using two auxiliary electrodes.
DC Resistance Measurement Position
Measures bond resistance using either two lead or four lead Kelvin system with a test
currents up to 250mA.
BNC Connections
Used for connecting the GroundFlex® sensors
to the Model 6474 amplifier.
Sensor Turns Rotary Switch
Used to match the amplifier module to the number of turns a
GroundFlex
More turns (up to 4) provides a stronger measurement signal.
®
sensor is wrapped around a tower leg.
Sensitivity Rotary Switch
Provides the ability to adjust the gain based on signal output from
GroundFlex
®
sensors to improve the accuracy and quality of the
measurement.
Input Rotary Switch
Used for selecting a specific tower leg to test
or the sum of all legs.
FUNCTIONAL DISPLAYS
4-Point Bond Test
The 4-Point (Kelvin sensing) Bond test shows
lead connections, bond resistance test results,
test voltage and current.
Two Clamp Test
3-Point Fall-of-Potential Test
The 3-Point Fall-of-Potential test displays test lead
connection, grounding system resistance and test
electrode resistances. Test voltage,
frequency can also be displayed with a button press.
current or
Tower Leg Measurement
Conduct ground resistance tests using
two clamps, eliminating the need for
installing auxiliary rods.
Schlumberger Test
The Schlumberger test displays test lead
connection, soil resistivity test results (
electrode spacing.
r) and
Displays resistance to earth of individual legs
or sum of all tower legs.
Wenner Test
The Wenner test displays test lead connection,
soil resistivity test results (
spacing and resistance.
r), electrode
TEST MODES
AUTO
In this mode the instrument performs an initial measurement at 128Hz and then scans and chooses the most
appropriate frequency in the event of interference to provide a clean and accurate test result.
SWEEP
Automatic measurements at up to 14 preselected frequencies between 41 and 5078Hz allowing a graph of impedance as
a function of frequency to be plotted. Frequencies used can be user selected or using the DataView
®
software.
MANUAL
User chooses the measurement frequency to be used. Choices are from 41 to 5078Hz.
Selection can be accomplished from the front panel or DataView
®
software.
EARTH COUPLING
Determines effects of two independent grounding systems on each other. Helps to identify the possibility of a fault
occurring in one system that can cause a potential rise in the other system. A unique testing method provided by AEMC
GROUNDFLEX® TEST METHOD
Test ground resistance of energized or de-energized
towers WITHOUT disconnecting the overhead ground
conductor (OGC)
®
.
major time and money saver and safety improvement
=
Test tower leg ground resistance
(individually and total)
Test leakage current through tower legs
Test the overhead ground conductor connectivity
Measure stray voltage
Test at frequencies up to 5kHz to profile impedance,
important to characterize for lightning strike
Determine if corrosion or broken ground connection
has occurred on any leg of the tower or the OGC
SOFTWARE
Data Analysis and Reporting Software
FREE DataView® software provides a convenient way to configure and control ground resistance tests from your
computer. Through the use of clear and easy-to-use tabbed dialog boxes, all of the Model 6472
configured and tests can then be initiated. Results can be displayed in real-time and stored in your PC. Standard
and customized reports can be printed along with the operator’s comments and analysis.
● Run tests and analyze real-time data from your PC
● Configure all test functions and parameters from your PC
● Customize views, templates and reports to your exact needs
● Create and store a complete library of configurations that
can be used with the Ground Resistance Tester as needed
●
Display Fall-of-Potential plots, tabular listings of test results,
resistance vs. frequency plots, soil resistivity and bonding tests
● Print reports using standard or custom templates you design
● Free updates are available through our website www.aemc.com
functions can be
Impedance vs. frequency plot
Typical report showing Fall-of-Potential
plot using DataView
®
software.
WHAT’S INCLUDED?
GroundFlex® System Models 6472 & 6474
Includes GroundFlex® Adapter Model 6474, four GroundFlex® sensors (5m) with twelve color-coded rings, connection lead, two
extension leads on H reel (black/green) with matching color alligator clips, one extra black and green alligator clip, six BNC
extension leads, calibration loop, three C-clamps, field carrying case with wheels and handle, one inverter 12V
200 watt (vehicle use), USB stick supplied with DataView
®
software and user manual.
dc to 120Vac
Cat. #2136.03
Includes Ground Resistance Tester Model 6472 Kit 500 ft Cat. #2135.54
ORDERING INFORMATION
Ground Resistance Tester Model 6472 Kit (500 ft) Includes meter, rechargeable NiMH batteries, optical USB cable, power adapter 110/240V with
power cord 115V US, two 500 ft color-coded leads on spools (red/blue), two 100 ft color-coded leads (hand-tied, green/black), one 30 ft lead (green), four
T-shaped auxiliary ground electrodes, set of five spaded lugs, one 100 ft AEMC® tape measure, DataView® software, ground tester workbook CD, carrying bag
for meter, carrying bag for kit, product warranty and registration card and a user manual.
GroundFlex® Field Kit Model 6474 Includes GroundFlex® Adapter Model 6474, four GroundFlex® sensors (5m) with twelve color-coded rings, connection
lead, two extension leads on H reel (black/green) with color-coded alligator clips, one extra black and green alligator clip, six BNC extension leads, calibration
loop, three C-clamps, carrying case with wheels and handle for meters, one inverter 12Vdc to 120Vac 200 watt (vehicle use) and user manual.
GroundFlex® Adapter Model 6474 w/{1} 10M GroundFlex® Includes GroundFlex® Adapter Model 6474, one GroundFlex® sensor (10m),
twelve color-coded rings, connection lead, two extension leads on H reel (black/green) with color-coded alligator clips, one extra green and black alligator clip,
one BNC extension lead, calibration loop, three C-clamps, one inverter 12VDC to 120VAC 200 watt (vehicle use), carrying case with wheels and handle for
meters, and user manual.
GroundFlex® Field Kit (Model 6474 & {1} 10M GroundFlex® w/Ground Tester Model 6472 Kit 500 ft
(Includes Cat. #2136.04 & Cat. #2135.54)
Cat. #2135.54
Cat. #2136.03
Cat. #2136.04
Cat. #2136.05
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176
TestEquipmentDepot.com
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