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User Manual
EG480
Earth Ground Resistance Tester
Introduction
Congratulations on your purchase of the Triplett Earth Ground Resistance Tester. This device can
measure Earth Ground Resistance (in 3 ranges), Earth Voltage and Resistance (up to 200k Ω and
AC and DC voltage.) This device was designed to meet EN61010-1 safety standards.
Safety
Please read the following safety information carefully before attempting to operate the meter
and use the meter only as specified in this manual.
Environmental safety information
Do not use meter outdoors when precipitation is likely
Installation Category III
Pollution degree 2
Altitude: 2000 meters max.
Ambient conditions: 32 to 104oF (0 to 40oC); RH: 80% max Observe the following international safety
warning symbols
Safety Symbols
Caution: Refer to this manual before using this meter
Dangerous Voltages
Meter is protected throughout by double or reinforced insulation
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Organizations that provide rules and guidelines for proper grounding
The National Electrical Code (NEC)
Underwriters Laboratories (UL)
National Fire Protection Association (NFPA)
American National Standards Institute (ANSI)
Occupational Safety Health Administration (OSHA)
Telecommunications Industry Standard (TIA)
Meter Description
1. Digital Display – See Display Description below
2. HOLD key – Freezes measurement value on display
3. Zero ADJ control- Adjusts Zero value on display
4. Backlight key – Turns on Backlight
5. TEST key – Enables Earth Resistance and Earth Voltage Tests
6. Function Selector switch – Selects desired range and function
Top View
1. V C Input (Red)
2. P Input (Yellow)
3. COM / E Input (Green)
Operation
ZERO Adjustment of Earth Resistance Ranges
1. Connect the long test leads to the meter as follows:
2. Set the function selector switch to the desired measurement range. (20, 200, 2000Ω)
3. Short the 3 test leads together by clipping them all to a single earth ground rod.
4. Press the TEST key.
5. Use the 0-Adjust knob to adjust the displayed reading to 000
6. Press the TEST key again to end the Zero adjustment process.
7. Perform this adjustment for each range.
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Green lead to the 'E' terminal (Green jack)
Yellow lead to the 'P' terminal (Yellow jack)
Red lead to the 'C' terminal (Red jack)
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Test Connection Diagram
1. EG480 Meter
2. Green Test Lead (E)
3. Yellow Test Lead (P)
4. Red Test Lead (C)
5. Existing Ground Rod
6. P1 Auxiliary Earth Bar
7. C1 Auxiliary Earth Bar
Earth Voltage Test
1. Set the Function selector switch to the EARTH VOLTAGE position (AC or DC)
2. Connect the 2 Voltage test leads to the meter.Connect the black and red leads - connect the
black lead to the E (green jack) and connect the Red test lead to the C (Red jack).
3. Connect the test leads to the item under test.
4. Confirm that the voltage measurement is less than 10V AC; otherwise accurate Earth
resistance measurements cannot be made. If voltage is present (higher than 10V AC), the
source of the voltage must be found and corrected before testing can continue.
Earth Ground Resistance test
• Connect the 3 test leads to the meter (1) as follows:
• Drive the Auxiliary Earth Bars P1 (6) & C1 (7) into the ground. Align the bars an equal distance
apart to the existing Earth ground rod connection and in a straight line as shown in the diagram
above.
If the auxiliary bars are placed in close proximity to the ground stake,
measurement inaccuracies will result.
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(Minimum distance between rods should be no less than 10 feet (3m).
• Connect the alligator clip end of the test leads to the Earth bars and existing ground rod
connection as shown above:
• Set the meter's function switch to the desired resistance range. (20, 200, 2000Ω).
• Zero the range as described in the Zero adjustment procedure above.
• Press the TEST button. . The “ “ icon will flash and the audible signal will sound.
• Note the displayed reading.
• If high resistance is detected, note the value and take appropriate steps to correct the
ground connection if necessary.
• Press the TEST key to end the test.
• Readings of “1” are typical when the test leads are not connected to the meter.
Green lead (2) to the 'E' terminal
Yellow lead (3) to the 'P' terminal
Red lead (4) to the 'C' terminal
Green lead (2) to the existing ground rod
(5) Yellow lead (3) to Earth Bar P1 (6)
Red lead (4) to the Earth Bar C1 (7)
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HOLD Function
The Hold function freezes the latest measurement reading on the LCD.
1. Press the HOLD key to freeze the reading on the LCD
2. Press the HOLD key again to exit the HOLD function.
3. The HOLD function does not retain measurement data if the meter is turned off.
Backlight
1. Press the “ “ key to turn on the backlight.
2. The backlight will turn off after approximately 15 seconds.
200k Resistance Measurement
1. Connect the red test lead to the V (C) connector and the black test lead to the COM (E)
connector.
2. Set the function selector switch to the 200k position.
3. Connect the test probes to the circuit under test.
4. Note the displayed Resistance value.
AC Voltage Measurement
A Connect the red test lead to the V (C) connector and the black test lead to the COM (E)
connector.
1. Set the function selector switch to the 750V AC position.
2. Connect the test probes to the circuit under test.
3. Note the displayed Voltage value.
DC Voltage Measurement
1. Connect the red test lead to the V (C) connector and the black test lead to the COM (E)
Three terminal Ground Resistance Measurement
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connector.
2. Set the function selector switch to the 1000V DC position.
3. Connect the test probes to the circuit under test.
4. Note the displayed Voltage value.
5.
1. Using the Red and Green (1.5m) test leads with the alligator clips,
Connect one of the banana jacks of the red test lead to the V (C) connector (Red) and the
other to the P (Yellow) connector on the meter.
2. Connect the Green test lead (1.5m) with the alligator clip to
the COM (E) (Green) connector on the meter.
3. Set the function selector switch to the one of the Earth
resistance positions. (20, 200, 2000Ω)
4. Perform the Zero adjustment as described above.
5. Connect the Red and Green test clips to the ground rod or other item to be measured.
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4. Press TEST button. The “ “ icon will flash and the audible signal will sound.
General Specifications
Measurements
Earth Ground Resistance (in 3 ranges), Earth Voltage,
AC Voltage to 750V and DC Voltage to 1000V and resistance.
Display
Large LCD with dual display
Sampling Time
2.5 times per second
Test lead length
Red lead: 50' (15m), Yellow: 33' (10m), Green: 16' (5m)
Over-range indication
'1' displayed as most significant digit
Power supply
Six 1.5V 'AA' batteries (included)
Low battery indication
LCD displays
icon
Auto Power Off
After approximately 15 minutes of use
Safety
EN-61010-1 category III
Weight
700g (24.7oz) with batteries
Dimensions
200 x 92 x 50 mm (7.9 x 3.62 x 2")
Operating Conditions
0ºC to 40ºC (32ºF to 104ºF), with < 80% RH
Storage Conditions
-10ºC to 60ºC (14ºF to 140ºF), with < 70% RH
5. Note the resistance reading on the display.
6. Press the TEST button to stop the test.
Maintenance
Battery Replacement
When the low battery icon ' ' appears on the LCD, the meter's batteries must be changed.
(A) Remove power and disconnect the test leads from the meter.
(B) Remove the tilt stand from the rear of the meter.
(C) Remove the 4 battery compartment screws with a Phillips head screwdriver.
(D) Remove the battery compartment cover and replace the six 1.5V 'AA' batteries.
(E) Affix compartment cover and tighten screw.
(F) Reattach the tilt stand.
You, as the end user, are legally bound (Battery ordinance) to return all
used batteries and accumulators; disposal in the household garbage is
prohibited!
You can hand over your used batteries / accumulators at collection points
in your community or wherever batteries / accumulators are sold!
Disposal: Follow the valid legal stipulations in respect of the disposal of the device at
the end of its lifecycle
Cleaning and Storage
Periodically wipe the meter's case with a damp cloth and mild detergent; do not use abrasives or
solvents. If the meter is not to be used for a period longer than 60 days, remove the batteries and
store them separately.
Specifications
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Measurement Specifications
Measurement
Range
Resolution
Accuracy
Earth Ground
20
0.01
± (2% reading + 10 digits)
200
0.1
Resistance
± (2% reading + 3 digits)
2000
1
Earth Voltage
0 to 200VAC
40 to 500Hz
0.1V
± (3% reading +3digits)
Resistance
0 to 200kΩ
0.1k
± (1% reading +2 digits)
Overload Protection: 250 Vrms
AC Voltage
0 to 750V
1V
± (1.2% reading +10 digits)
40 Hz to 400Hz
Overload Protection: 750 Vrms, Input Impedance: 10M
0 to 1000V
1V
± (0.8% reading +3 digits)
DC Voltage
Overload Protection: 1000 Vrms, Input Impedance: 10M
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Package Contents:
2
Ground rods - zinc plated iron (22cm)
6
- AA alkaline batteries
3
Ground rod test cables - Red (15m), Yellow (10m), Green(5m)
2
Test leads for Ground Resistance with alligator clips (Red and Green)
(1.5m)
2
Test leads for Voltage/Resistance (Black and Red) (1m) and Case
EG480 Earth Ground Resistance Meter
Warranty Information
Triplett / Jewell Instruments extends the following warranty to the original
purchaser of these goods for use. Triplett warrants to the original purchaser for
use that the products sold by it will be free from defects in workmanship and
material for a period of (1) one year from the date of purchase. This warranty
does not apply to any of our products which have been repaired or altered by
unauthorized persons in any way or purchased from unauthorized distributors so
as, in our sole judgment, to injure their stability or reliability, or which have been
subject to misuse, abuse, misapplication, negligence, accident or which have
had the serial numbers altered, defaced, or removed. Accessories, including
batteries are not covered by this warranty
Copyright © 2019 Triplett
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