FUZRR ES3000 User manual

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CONTENT
I．Safety Precautions and Procedures……………………………………………2
II．Introduction……………………………………………………………………3
III. Rang and Accuracy……………………………………………………………3
IV．Technical Specifications……………………………………………………3
V．Structure…………………………………………………………………………6
VI．Measuring Principle…………………………………………………………6
VII. Functional Quick Check……………………………………………………7
VIII．Operation……………………………………………………………………7
1．Switch on/off……………………………………………………………………7
2. Battery Voltage Check………………………………………………………7
3. Ground voltage measurement………………………………………………7
4．Wire resistance check………………………………………………………8
5．Grounding Resistance Precision Measurement……………………………9
6．Simple Method for Measuring Ground Resistance……………………10
7．Backlight Control…………………………………………………………11
8．Alarm Setting………………………………………………………………11
9．Data Lock/Storage…………………………………………………………11
10．Data Review/Delection…………………………………………………12
11．Data Upload………………………………………………………………12
IX. Battery Instructions……………………………………………………13
X．Accessories……………………………………………………………………13

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I．Safety Precautions and Procedures
Thank you for purchasing our company's digital grounding resistance
tester. Before using the instrument for the first time, in order to avoid
possible electric shock or personal injury, please be sure to read and
strictly observe the safety rules and precautions listed in this manual.
In any case, the use of this instrument should pay special attention to
safety.
The instrument is designed, produced and inspected according to IEC61010
safety specifications.
In any case, the use of this instrument should pay special attention to
safety.
When measuring, high-frequency signal generators such as mobile phones
should not be used next to the meter to avoid errors.
Pay attention to the text and symbols on the body of the instrument.
Before use, make sure that the instrument and accessories are in good
condition. The insulation layer of the instrument and test wire is not
damaged, exposed or broken.
During the measurement, it is forbidden to touch exposed conductors and
the circuit being measured.
Make sure the connection plug of the wire is tightly inserted in the meter
connector.
Do not apply more than 100V AC voltage or DC voltage between the test
terminal and the interface, doing so may damage the meter.
Do not measure in flammable places, sparks may cause explosion.
When the instrument is in use and the enclosure or test wire is broken
and the metal is exposed, please stop using it.
Do not place and store the instrument for a long period of time under
conditions of high temperature, humidity, condensation, and direct
sunlight.
When charging the battery, make sure the test line has been removed from
the meter and the meter is off.
The meter displays the battery voltage low symbol “ ” and should be
charged in time.
Pay attention to the measuring range and use environment specified by this
instrument.
The use, disassembly, calibration and maintenance of this instrument must
be performed by authorized personnel.
Because of the reason of this instrument, if it is dangerous to continue
using it, it should be immediately stopped and sealed immediately, and

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it should be handled by a qualified organization.
The " " safety warning sign in the instrument and manual must be operated
strictly in accordance with the contents of this manual.
II．Introduction
Digital grounding resistance tester, also known as the three-wire
grounding resistance tester, grounding resistance meter, etc., is a commonly
used meter for measuring grounding resistance. It adopts a large LCD
gray-white screen backlight display and microprocessor technology to meet
the requirements of two-wire and three-wire test resistance. Suitable for
telecommunications, electricity, meteorology, computer rooms, oil fields,
power distribution lines, iron tower transmission lines, gas stations,
factory grounding networks, lightning rods and so on. Instrument testing is
precise, fast, simple, stable and reliable.
The digital grounding resistance tester is controlled by the
microprocessor and can automatically detect the connection status of each
interface and the interference voltage and interference frequency of the
ground network, and has the function of testing the auxiliary grounding
resistance value. At the same time store 500 sets of data, resistance
measurement range: 0.01Ω ~ 3000Ω, grounding voltage range: 0.01 ~ 100.0V.
Online monitoring data through monitoring software, USB data uploaded to PC
and unique features such as intelligent alarm alert
The digital grounding resistance tester consists of host, monitoring
software, test line, USB cable, and grounding rod. It has the functions of
reading, checking, saving, reporting and printing of historical data.
III. Rang and Accuracy
Measurement
function
Range
Accuracy
Resolution
Grounding
Resistance
0.01Ω～30.00Ω
±1.5%rdg±5dgt
(Auxiliary ground
resistance 100Ω ± 5%,
voltage to ground <10V)
0.01Ω
30.1Ω～300Ω
0.1Ω
301Ω～3000Ω
1Ω
Grounding
Voltage
0.01～10.00V AC
±1%rdg±3dgt
0.01V
10.1～100.0V
0.1V
（Remark：23℃±5℃，below 75%rh）
IV．Technical Specifications
Grounding
Resistance Range
0.01Ω～3000Ω Accuracy ±1.5%rdg±5dgt

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Grounding
Resistance
Resolution
0.01Ω
Grounding
Voltage Range
0.01～100.0V AC Accuracy ±1%rdg±3dgt
Grounding
Voltage
Resolution
0.01V
Baseline
conditions
23℃±5℃，below 75%rh (Auxiliary ground resistance
100Ω ± 5%, voltage to ground <10V)
Function
Earth resistance measurement, ground voltage
measurement, low value resistance measurement
Power
DC 6V Lead-acid batteries
Backlight
Controllable gray screen backlight, suitable for use
in dim places
measurement mode
Precise three-wire measurement, simple two-wire
measurement
Measurement
methods
Grounding resistance: rated current change pole
method, test current > 20mA (sine wave), 128Hz；
Ground Voltage: Average Rectification
Test frequency
128Hz
Display mode
4-bit large LCD display, gray screen backlight
Measurement
instructions
LED flashing indicator during measurement, LCD
countdown display
LCD size
108mm×65mm
Instrument size
L/W/H：277.2mm×227.5mm×153mm
Test line length
3 strips：red 15m，yellow10m，green 5m each one
Simple test line
2strips：red 1.6m，green 1.6m each one
Auxiliary
Grounding rod
2PCS：φ10mm×200mm
Measure time
Ground voltage ： about 2 times/sec; grounding
resistance: about 5 seconds/time
Measurement
times
5000 times or more
Line voltage
Measuring grounding voltage : AC 600V or less
USB interface
With USB interface, software monitoring, storage data
can be uploaded to the computer, save and print
Communication
Line
One USB communication line, 1.5m long
Data storage
500 groups, flashing "FULL" symbol indicates that the
memory is full

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Data review
Data review function: "MR" symbol display
Overflow display
Over-range overflow function: "OL" symbol display
Alarm function
Alarm when the measured value exceeds the alarm setting
value
Battery voltage
Real-time display of battery power, reminding timely
charging when battery voltage is low
Power
consumption
Backlight：25mA Max
Standby: 25mA Max(Backlight off)
measuring：70mA Max(Backlight off)
Weight
Instrument： 2397g(included battery)
Test lines：861.5g(included simple test line)
Auxiliary grounding rod： 425g(2pcs)
Instrument bag： 271g
Working
temperature and
humidity
-10℃～40℃；below 80%rh
Storage
temperature and
humidity
-20℃～60℃；below 70%rh
Overload
protection
Grounding resistance：AC 280V/3 seconds between E-H and
E-S ports
Insulation
resistance
10MΩ以上(500V between circuit and housing)
Pressure
resistance
AC 3700V/rms(between circuit and housing)
Electromagnetic
properties
IEC61010-4-3 ， Wireless frequency electromagnetic
field≤1V/m
Suitable for
safety
regulations
IEC61010-1 、 IEC1010-2-31 、 IEC61557-1,5 、
IEC60529(IP54)、Pollution level 2、CAT Ⅲ 300V

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V．Structure
1. LCD 2. Hinterface：current pole
3. Sinterface ： voltage pole 4. Einterface ： grounding pole
5. Function button 6. DC charging 7. USB interface
8. Test button 9. Safety Alligator Clip 10.Test line
11. Grounding rob 12. Easy test line
13.Simple test line short connector
VI．Measuring Principle
1．Ground voltage measurement using average rectification。
2．The grounding resistance value is measured using the rated current change
method, that is, the rated current I(30mA Max, 128Hz) flowing between the
measuring object E(ground electrode) and H(current electrode); seeking E
and S(voltage electrode) Potential difference V, then the method to determine
the ground resistance Rx。
Rx=V/I

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3．The working error (B) is the error within the rated operating conditions,
which is calculated from the inherent error (A) and variation error (Ei) of
the existing instrument.。
A： inherent error E1：Changes due to location changes
E2：Changes due to power supply voltage changes
E3：Changes due to temperature changes
E4：Changes due to disturbance voltage variations
E5：Changes due to contact electrode resistance
E7：Changes due to system frequency changes
E8：Changes due to system voltage changes
VII. Functional Quick Check
POWER
Switch on/off
MEM
Data browsing/value setting
Backlight
button
Backlight control
TEST button
Start measuring
button
Delete data measurement selection
button
Wire resistance check/delete data measurement
selection
SET button
Set alarm value/delete data
MEM button
Data Lock/Store/View
button
Alarm function start/alarm threshold setting
R and U
Measure gear selection
VIII．Operation
1．Switch on/off
Press the POWER button to switch on and off. After turning on the machine,
the lower corner shows "APO" and it will automatically shut down after 15
minutes when it is not operating.
2．Battery Voltage Check
After powering on, if the LCD shows a low battery voltage symbol “ ”,
it indicates that the battery is running low. Please charge it in time. The
battery power is sufficient to ensure the accuracy of the measurement. When
the battery power decreases, the power indicator bar decreases.
3．Ground Voltage Measurement
Before measuring, please make sure that the plug of the test line
is fully inserted into the corresponding interface of the meter.

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If the plug is not fully inserted or contacted, the measurement
value may be incorrect.
This instrument can not be used for commercial power supply
voltage measurement, special circumstances need to measure, only
can use the S and E interfaces connect to measure, the commercial
power supply voltage cannot be measured when the H and S
interfaces are shorted. Otherwise, the voltage is measured in the
ground loop of the circuit breaker and the circuit breaker may
start.
Do not apply more than 100V across the measurement interface when
measuring ground voltage.
When measuring ground voltage, do not touch exposed conductors
to avoid electric shock.
After the auxiliary grounding rod and test line are connected, switch
the function button U to the voltage level, the LCD displays the ground voltage,
and the measured voltage to ground cannot exceed 100 V.
Under normal circumstances, measure the ground voltage and connect only
the corresponding test lines of the S and E interfaces. As shown:
Notice
When measuring the grounding resistance, first confirm that the
voltage to the ground must be less than 10V. If the voltage is
more than 10V, the measured value of the grounding resistance
may cause an error. At this time, the grounded device shall be
powered off first. After the ground voltage drops, measure the
ground resistance again.
4．Wire resistance check
In order to improve the precision and stability of the grounding
resistance measured in the field, the error caused by the change of the wire
resistance due to the test line being used for a long time is avoided; To
avoid the error caused by the test line not completely inserted into the

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instrument interface or poor contact; to avoid the error caused by the user
to replace or lengthen the test line, the line resistance check function is
specially designed to measure the low-value resistance more accurately.
After connecting the test line and the meter, short the other end of all
the test lines. As shown in the figure below, press the function button R
to switch to the corresponding ground resistance measurement position. Press
“ ” key to start calibration, LED indicator flashes during calibration,
LCD countdown display, LCD display after calibration.
Shutdown does not save the verification line resistance. The next time
it is turned on, it needs to be recalibrated.
5．Grounding Resistance Precision Measurement
Before measuring, please make sure that the plug of the test line
is fully inserted into the corresponding interface of the meter.
If the plug is not fully inserted or contacted, the measurement
value may be incorrect.
For low-value ground resistance measurement, the measurement is
more accurate after line resistance check
When the grounding resistance is measured, the maximum voltage
of about 50V will be generated between the E and H interfaces!
Do not apply voltage between the measurement interfaces. Please
be careful to avoid electric shocks.
When measure ground resistance , the test line can not be mixed,
the test line should be measured separately
The auxiliary grounding rods H, S can be buried in places where
there is a large amount of water, so as to reduce the auxiliary
grounding resistance value and can reduce the indication error.
After the precision measurement grounding resistance adopts three-wire
connection, the auxiliary grounding rod and the test line are all connected,
switch the function to measure the resistance R mode, and press the “TEST”
key to start measure.LED flashes during measurement, LCD countdown display,
light off after measurement is complete, LCD shows measured value.From the
measured object, every 5 to 10 meters, insert the auxiliary grounding rod
into the earth in a straight line.Connect the grounding test lines (red,

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yellow, and green) from the H, S, and E ports of the meter to the auxiliary
current electrode H, auxiliary voltage electrode S, and ground electrode E
under test. As shown:
6．Simple Method for Measuring Ground Resistance
When using the commercial power system grounding as an auxiliary
grounding pole to measure, it must be confirmed by the checker
that it is the grounding pole of a commercial power system.
Cannot use this meter to confirm grounding pole of commercial
power system
This method is a simple measurement method that does not use an auxiliary
grounding rod. The grounding electrode with the smallest grounding resistance
is used as the auxiliary grounding electrode, and two simple test wires are
connected (that is, the H and S interfaces are short-circuited).Instead of
the auxiliary grounding rods H, S, metal burying materials such as metal pipes
or fire hydrants, common grounding of commercial power systems, or lightning
protection grounds of buildings may be used.Take care to remove the oxide
layer at the connection point of the selected metal auxiliary grounding body
during measurement.
Grounding resistance simple test wiring as shown below, other operations and
precision measurement。

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The simple method measures the grounding resistance. The instrument
reading value is the sum of the grounding resistance of the measured grounding
body and the grounding resistance of the commercial grounding body. That is：
RE=RX＋re
And： RE is the meter reading value；
RX is the grounding resistance value of the grounding body under
test；
re is the grounding resistance value of a common grounding body such
as a commercial power system.
Then, the grounding resistance of the measured grounding body is：
RX=RE－re
Use a simple method to measure the grounding resistance, and try to select
the grounding body with a small re value as the auxiliary grounding electrode
so that the meter reading is closer to the true value. When measuring, please
choose metal water pipe and fire hydrant as auxiliary ground electrode。
Notice
Simple method to measure the grounding resistance, also need to
confirm that the voltage to the ground must be below 10V. If the
voltage is above 10V, the measured value of the grounding
resistance may have errors. At this time, first power off the
device of the grounding body under test. Measure the grounding
resistance after the grounding voltage drop..
7．Backlight Control
After power on, press “ ” key to turn the backlight on or off, and
the backlight function is suitable for dim places. The default backlight turns
off every time you turn it on.
8．Alarm Setting
After power on, short press “ ” to turn on and off the alarm function.
Short press "SET" key to set the resistance alarm value, press " " key to
move the cursor, press " " or " " key to change the current size, and
then press "SET" key to save and exit. When the measured value is greater
than the alarm critical setting value and the alarm function is turned on,
the meter displays the " " symbol and issues a “beep-beep-beep--” alarm
sound.
9．Data Lock/Storage
After the power-on or measurement is completed, short press "MEM" key
to lock the current display data,and automatically numbered and storage. If
the memory is full, the meter displays the "FULL" symbol. As shown below:

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The measurement data is 1032Ω. Short press “MEM” to display the data showed
that it is stored as the third group.
10．Data Review/Delection
After the power on or measurement is completed, press and hold the "MEM"
button (more than 3 seconds) to enter the data review mode.The interface
corresponding to the stored data interface and the stored data group number
flash alternately.Press " " or " " key to select the corresponding data
of the array number with a step by 1, hold down the " " or " " key to
select the array number with a step by 5, then press "MEM" to exit.See below
In the figure below, the number 3 is the current group number, and 6 is
the total group number. If no data is stored, the LCD displays "NULL". See
the figure below.
Under data review status, press "SET" key to enter data deletion, press
" " or " " key to select "NO" or "YES", select "NO" and then press “SET”
key to not return data review status, select "YES". Press the "SET" key again
to delete the stored data. After the deletion, the following figure is
displayed.
11．Data Upload
Connect the USB communication cable of the computer and the instrument,
turn on the instrument and run the monitoring software. If the USB connection

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is successful, the stored historical data can be read, uploaded to the
computer and saved.
The monitoring software has on-line real-time monitoring and historical
query functions, dynamic display, alarm value setting and alarm indication
function, and functions such as reading, viewing, saving and printing of
historical data.
IX. Battery Instructions
The instrument is powered by a 6V lead-acid battery. When the battery
power is reduced, the power indicator bar is reduced. When the voltage drops
to 5V, the battery symbol “ ” is displayed. Please charge in time. Low
voltage affects the measurement accuracy.
X．Accessories
Instrument
1PC
Instrument bag
1PC
Auxiliary grounding rod
2PCS
Monitoring software CD
1PC
USB communication line
1PC
Test line
3PCS
Simple test line
2PCS
6V Battery (built-in)
1PC
charger
1PC
Manual, certificate
1SET

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The contents of this user manual cannot be used as a reason to use the product for special purposes.
The company is not responsible for other losses caused by use.
The company reserves the right to modify the contents of the user manual. If there is any change, it will not be
notified.
GuangZhou ZhengNeng Electronics Technology Co.
Address: 2F, No.15 Baoshu Road, Taihe, Baiyun District, Guangzhou, Guangdong, China
Toll-free call：4000-1515-38
Tel：[phone]
Fax：[phone]
Post：510540
WebSite：www.znele.com