Terra Exploration Group EZ Res Pro Technical User Manual

Terra EZ ResTM Pro

Earth R/P Analyzer

Technical User's Guide

2/3/4 Probes

Copyright 2016

Terra Exploration Group

Austin, Texas, USA

512-280-9600

www.TexGru.com

CONTENTS

Warning .............................................................................................. 1

I．Introduction .................................................................................. 3

II．Technical Specifications

1. Base Conditions and Working Conditions ............................ 4

2. General Specification ............................................................. 4

3. Intrinsic error and performance indicators under base

conditions ................................................................................... 8

III． Tester Structure ......................................................................... 8

IV．

LCD Di

V．Measuring Principle .................................................................. 10

VI. Operation Methods ..................................................................... 11

1．Switch On/Off .................................................................... 11

2．Battery Voltage Check ........................................................ 11

3．AC Voltage Measurement .................................................. 11

4．Earth Voltage Measurement ............................................... 12

5．4-wires Precise Earth Resistance Measurement ................. 13

6．3-Wires Earth Resistance Measurement ............................. 15

7．2-Wires Simple Measurement ............................................ 15

8．Soil Resistivity Measurement ............................................ 17

9．Backlight Control .............................................................. 18

10．Alarm Settings ................................................................. 18

11．Data Lock/Storage ............................................................ 18

12．Data Reading/Deletion ..................................................... 19

13．Data Upload ..................................................................... 19

splay .............................................................................. 9

............................................................. 4

VII.

. Battery Replacement ..............................................................19

VIII．Accessories ............................................................................ 20

Warning

Thanks for your purchase of Terra EZ Res Pro
Digital Earth Analyzer. For best results, thoroughly

read and completely understand this User's Guide.

 The tester conforms to IEC61010 in design, production

and testing.

 Under all circumstances, pay special attention to the

safe use of this device.

 Avoid nearby use

phones to avoid electrical interference errors during device operation.

Pay attention to warnings and symbols shown on the device.

 Make sure that device and accessories are in good

working order before use. Do not use if there are broken parts or
exposed areas of test wires. Do not touch probes while

measurement is in progress---risk of electrical shock!!!!

During measurement, do not touch bare conductors or circuits



under measurement.

Before measurement, please set rotary FUNCTION



switch to desired measuring position.

Confirm that connector plug of leads have been completely



inserted into device interface.

Do not expose to Earth Voltage exceeding 600V A.C. or D.C.



between probes and interface as this may seriously damage the
device.

of high-frequency signal generators like mobile

-1-

 Do not operate device in the presence of flammables, as a spark
spark could initiate an explosion or fire.

 Do not use device if test wires are damaged with uninsulated wire
exposed.

 Do not expose the device to high temperatures, high humidity or
 condensation.

 Do not leave device exposed to direct sunlight

for expended periods to avoid excessive heating of electronics.

 For battery replacement, remove testing wire from device
interface, and make sure that rotary FUNCTION switch

is in “OFF” position.

 Dispose of used batteries in an appropriate manner.
 When the meter displays battery low voltage symbol, replace

batteries.



The Tester has no

auto shut-off function. U

of

Testing complete, turn rotary FUNCTION switch to "Off"

 If the Tester is not going to be used for a long period, remove

batteries to prevent battery corrosion and damage to the device.



This measuring device is only to be disassembled,
adjusted and/or and repaired by distributor-authorized
personnel---all other use will void warranty.

 Risk of severe electrical shock exists through improper

use of this device

Device users must perform all operations

.

as instructed in this user's guide.

-2-

- 2 -

I．Introduction

The Terra EZ Res Pro is specially designed and

manufactured for measuring earth resistance, soil resistivity and
AC voltage. Utilizing state-of-the-art digital and micro-processing

technology precise earth resistance and soil resistivity
measurements can utilize 2, 3 or 4 probe arrays. The EZ Res Pro
possesses an unique function of wire resistance verification,
anti-interference capability and the ability to adapt to the
environment---all to ensure high precision, high stability and
reliability for prolonged and complicated measurements. The
EZ Res Pro is very effective in locating caves and tunnels as
well as underground water and mineral veins through the use
of electrical resistance tomography to accurately locate desired
subterranean anomalies. The EZ Res Pro is also widely used in

commercial power, telecommunications, oil field applications and
general construction.

The Terra EZ Res Pro is composed of a

host device, monitoring software, testing wires,
communication wires, probes and a carrying case. The large
LCD display of device offers blue back-light for dark conditions
and a digital bar graph for ease of viewing. The Terra EZ Res
Pro can store sets of data of 300 individual readings, allowing
post-analysis via the included Data Collection and Analysis
Software, showing the maximum, minimum, and average
resistivity values. Included are alarm settings and an
alarm indicator as well as historical data access,
reading, preservation, report forms and printing.

The Terra EZ Res Pro Earth Analyzer may also

be called: Precise Earth Resistance Tester, 4-pole

Earth Resistance Tester, 2/3/4-pole Earth Resistance
Tester and/or Soil Resistivity Tester.

-3-

-4-

II．Technical Specifications

Working

Conditions

Ambient Temp

Ambient Humidity

＜80%

Working Voltage

9V±1.5V

Auxiliary Earth

Resistance

＜30kΩ

Interference Voltage

＜20V

Interference Current

＜2A

Electrode Distance

when measuring R

a＞5d

Electrode Distance

when measuring ρ

a＞20h

Function

Measurement of 2/3/4-pole earth resistance, soil
resistivity, earth voltage, AC voltage

Power Supply

Measurement

Range

Earth Resistance: 0.00Ω-30.00kΩ

Soil Resistivity: 0.00Ωm-9000kΩm

Measuring

Measuring

Test Frequency

128Hz/111Hz/105Hz/94Hz(AFC)

Short-circuit
Test Current

AC 20mA max

Open-circuit
Test Current

AC 40V max

Test Voltage

Wave

Sine wave

Electrode

Distance Range

Shift

Earth resistance: 0.00Ω-30.00kΩ, automatic shift

1. Working Conditions

Influence Description

2. General Specification

DC 9V(6 High Quality Alkaline C Cells 1.5V
continuous standby for 300 hours )

15F-105F

Modes

Methods

Precise 4-probe measurement, 3-probe
measurement and simple 2-probe measurement

Earth Resistance: rated current change-pole
method, measurement current 20mA Max
Soil Resistivity: 4-pole measurement
(Wenner or Schlumberger Arrays))
Earth Voltage: average rectification(between P(S)-ES)

Outside probes can be set up to 330' apart .

-5-

Soil Resistivity: 0.00Ωm-9000kΩm, automatic shift

Backlight

Display Mode

4-digital super-large LCD display, blue screen
backlight

Measuring

Indicator

During measurement, LED flash indicator, LCD count
down display, progress bar indicator

LCD Frame
Dimension

LCD Window

Dimension

Dimension

Standard Test

Wire

Simple Test

Wire

Landscape

Measuring Rate

Voltage to ground: about 3 times/second

Earth resistance, soil resistivity: about 5 seconds/time

Measuring

Times

Over 5000 times (Short-circuit test, interval time
should be at least 30 seconds)

Circuit Voltage

RS232 Interface

Communication

Wire

Data Storage

Data Hold

Data hold function: “HOLD” icon display

Data Read

Data read function: “READ” icon display

Overflow

Display

Exceeding measuring range overflow function: “OL”

icon display

Interference

Test

Recognize interference signal automatically, “NOISE”

icon display when interference voltage exceed 5V

Auxiliary
Earthing Test

Can measure auxiliary earth resistance, 0.00KΩ­30kΩ(100R+rC<50kΩ, 100R+rP<50kΩ)

Alarm Function

Battery Voltage

Spikes

Blue screen backlight, suitable for dim light use

5"×3"mm

4.9"×2.6"

L×W×H: 8.5"×7.5"×3.75"
4 wires: red 200 feet, black 200 feet, yellow 100
feet, and green 100 feet

2 wires: red and black 5.2 feet each

4 probes: 3/8" x 12"

Below AC 600V

RS232 interface, software supervision, storage
data can be uploaded to computer, saved or printed.

One RS 232 Cable

300 measurements, “MEM” icon storage indicator,
flash display “FULL” icon to indicate storage is full

When measuring value exceeds alarm setting value,

an alarm will sound.

When battery voltage decreases to about 7.5V,

low battery voltage icon will display, indicating

battery replacement is necessary.