DUOYI DY4100 Ground Resistance Tester 0-2000ohm Real Digital Earth Tester

Overvoltage protection
Data hold
low battery warning
high accuracy 
LCD digital display screen
outdoor dust wet proof 

Digital earth resistance tester DY4100 is a new generation tester for electrician practice which is developed by DUOYI in recent years. 

The circuit, structure and technique of traditional earth resistance tester have been improved and the new design is both fine-looking and practical.

This one has more complete functions, higher accuracy, more convenient and reliable for operation and more suitable for outdoor use with dust and wet proof structure.

It can test earth resistance of various earth systems including power systems, electric equipments, lightning conductors as well as resistance value of low resistance conductor and AC voltage test.

Features: 

Resolution:0.01 ohm
Data Hold:yes
Working LED Indicator:yes
Function Symbol Display:yes

1. Measuring range of earth resistance: 0-2000Ω. 0/20/200/2000 ohm ±(2%+3)
2. Measuring range of earth voltage: 0-30V(3%+5)
3.LED green light indicates normal operating mode.
4.31/2 digit LCD display for more direct and convenient reading.
5. Low Battery Warning: 
on LCD indicates deficiency of 12V battery. 
LED red lighting off indicates deficiency of 1.5V battery.
6. Response time: measure earth resistance, about 5 seconds. Measure earth voltage, about 2 seconds.
7.Withstand voltage: AC 500V, 1 minute between circuit and outer casing.
8. Overload protection: on earth voltage, can withstand 300V AC 1 minute . 
on earth resistance, can withstand 200V AC 10 seconds .
9. Power supply,six 1.5V AA batteries ,one 12V battery 23A.
10.Product Size:150×100×70mm.
11.Weight: about 680g NOT including battery .
12. Working environment:
Working temperature:0°C-40°C relative humidity < 80%
Storage temperature: - 10°C-50°C relative humidity < 85%
Ensured accurate temperature:23°C±5°C
relative humidity < 80%
Power:AA1.5Vx6(UM3) (not include battery)

① LCD display
② E port earth electrode
③ P port electric potential pole
④ C port current pole
⑤ V port voltage pole .
⑥ Function switch.
⑦ HOLD data holding switch
⑧ TEST testing button
⑨ POWER power indicator light (red)
⑩ OK operation indicator light (green)

Operation Instruction

a.Battery Voltage Inspection

b. 3-wire Earth Resistance Test

NOTE: maximum 50V voltage may be generated between E-C or E-P terminals when testing earth resistance

Please do not touch testing lead to avoid electric shock.

Please make sure testing wire plug insert in testing

terminal thoroughly before testing since loose connection may cause error in testing result.


1） Testing Wire Connection

As shown in picture below, punch assistant earth bar P1and C1 in earth 5 to10 meters distant from tested earth substance; connect green wire to terminal E, yellow wire to terminal P and red wire to terminal C

2） Inspection of Power Supply and Wire Connection Press Test/Stop , POWER light off indicates insufficient 1.5V battery. Please replace it.

OK light on indicates normal connecting of lead and E, C terminals, and auxiliary earth resistance is within permitted range. If light is off, check the lead connecting E and C terminals or change the position of

earth bar, or water the land to lower auxiliary earth resistance to a proper level. Check breakage by short circuit of spring clamps of red and green lead .


3) Earth Voltage Measurement

Please turn the range select switch to earth voltage.Make sure the voltage value below 10V since error may occur to measuring value of earth voltage if the voltage


value above 10V. At this point, one can break the power supply of tested earth electrode equipment to lower earth voltage and then measure the value

4) Earth Resistance Measurement


First please press Test/Stop beginning from2000 .

If the shown value is too small, switch to 200/20 and the shown value here is namely the tested earth resistance value.


Note: make sure connecting wires separated during wire connecting since testing when testing leads wind about with each other may encounter mutual inductance to affect reading. The auxiliary earth

resistance value may be too big and error may occur to show value. Make sure auxiliary earth bar P and C into wet land and complete contact of connecting parts.

c. Simple Earth Resistance Measurement

The method is designed for places where auxiliary earth bar cannot be punched. Use a earth electrode with quite small earth resistance like metal water pipe, common earth electrode of commercial electric power system, earth end of building, etc to substitute auxiliary earth bar P and C.

1)Testing Wire Connection

NOTE: be careful of electric shock when using commercial electric system earth method for test.Please do not use this tester to measure supply voltage.

2)Earth Voltage Measurement

Please turn the range select switch to earth voltage.Make sure the voltage value below 10V since error may occur to measuring value of earth voltage if the voltage value above 10V. At this point, one can break the power supply of tested earth electrode equipment to lower earth voltage and then measure the value.

3)Earth Resistance Measurement

First please press Test/Stop beginning from 2000 . If the shown value is too low , switch to 200/20 to do the test and the reading here is the tested earth resistance value.
Note: Since measuring current is low to about 2mA,Calculate the real earth voltage value RX by equation below:
RX=RE-re

re: earth resistance of common earth electrode of commercial electric power system, etc.
Re: reading value of instrument earth resistance.

Q&A

1. it not include battery , is it model easy to found  ?

Battery: 6*  1.5V AA batteries ,1*  12V battery 23A

Accessories

1. 2*auxiliary earth bar            
2. testing wire   
red 15-meter testing wire 
yellow 10-meter testing wire 
green 5-meter testing wire
3 . 1*simple testing wire             
red 1.6-meter testing wire 
green 1.6-meter testing wire)
4. 1*instruction manual              
5.1*tool bag