DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления
DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления
DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления
DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления
DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления
DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления

DW257 четырехпроводный тестер сопротивления заземлению Измеритель заземления


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Цена:481,00 $*

Количество:



Описание и отзывы


Трекер стоимости

Месяц Минимальная цена Макс. стоимость
Aug-20-2025 611.20 $* 623.23 $*
Jul-20-2025 495.36 $* 505.77 $*
Jun-20-2025 601.31 $* 613.33 $*
May-20-2025 596.30 $* 608.34 $*
Apr-20-2025 476.26 $* 486.75 $*
Mar-20-2025 587.15 $* 599.82 $*
Feb-20-2025 582.44 $* 594.87 $*
Jan-20-2025 577.59 $* 589.93 $*

Характеристики



Products Description


DW257 soil resistivity ground resistance tester
DW257 soil resistivity ground resistance tester, also known as the soil resistivity tester is a common instrument used to test
and measure the earth resistance. It USES a large LCD grey screen backlight display and microprocessor technology, through the
microprocessor control of the 2 line, 3 line, 4 line French ground resistance test and soil resistivity test.Many grounding
testing functions are collected, which can quickly and comprehensively measure various parameters in the grounding network.It is
widely used in telecommunication, electric power, meteorology, machine room, oil field, electric power distribution line, tower
transmission line, gas station, factory grounding grid, lightning rod and so on.The instrument has the characteristics of
accurate, fast, simple, stable and reliable test.
The DW257 soil resistivity ground resistance tester is controlled by a microprocessor to accurately detect ground resistance,
soil resistivity and ground voltage.It USES fast filtering technology to minimize interference.The resistance value of the
auxiliary electrode is displayed on the same screen, which is convenient to judge the measurement error caused by environmental
factors and to measure the real resistance value of the ground more accurately. At the same time, 500 sets of data are stored,
which can be monitored online through monitoring software. USB data can be uploaded to PC with unique functions such as numerical
maintenance and intelligent alarm.
The DW257 soil resistivity ground resistance tester is composed of a host, monitoring software, test wire, USB wire, and ground
needle. It has the functions of reading, consulting, saving, reporting and printing historical data..


Product Paramenters


Range and Accuracy error
Measurement function
Measurement range
Accuracy
Resolution
Grounding resistance
(R)
0.00Ω~30.00Ω
±2%rdg±5dgt (remark 1)
0.01Ω
30.0Ω~300.0Ω
±2%rdg±3dgt
0.1Ω
300Ω~3000Ω
±2%rdg±3dgt
1Ω
3.00kΩ~30.00kΩ
±2%rdg±3dgt
10Ω
Soil resistivity
(ρ)
0.00Ωm~99.99Ωm
ρ=2πaR (remark 2)
0.01Ωm
100.0Ωm~999.9Ωm
0.1Ωm
1000Ωm~9999Ωm
1Ωm
10.00kΩm~99.99kΩm
10Ωm
100.0kΩm~999.9kΩm
100Ωm
1000kΩm~9999kΩm
1kΩm
Grounding voltage
AC 0.00~100.0V
±2%rdg±3dgt
0.01V


General specification
Function
Two three four-wire measure grounding resistance, soil resistivity;
Ground voltage, AC voltage measurement
Ambient temperature and humidity
23℃±5℃,below 75%rh
Power
DC 6V 4.5Ah lead-acid battery lasts more than 100 hours standby
Interference voltage
<20V (should be avoided)
Interference current
<2A (should be avoided)
Measure R electrode spacing
a>5d
Measured electrode spacing
a>20h
Auxiliary ground resistance
Reference condition <100Ω, working condition <5kΩ
Range
Grounding resistance: 0.00Ω~30.00kΩ
Soil resistivity: 0.00Ωm~9999kΩm
Grounding voltage: 0.00V~100.0V
measurement mode
Precise four-wire, three-wire measurement, simple two-wire measurement
Measurement methods
Grounding resistance: rated current change pole method
Soil resistivity: four-pole method
Ground Voltage: Average Rectification(between S-ES interface)
Test frequency
128Hz
Short circuit test current
> 20mA (Sine Wave)
Open circuit test voltage
AC 28V max
Electrode spacing range
Can be set 1m ~ 100m
Change gear
fully automatic shifting 0.00Ω ~ 30.00kΩ
fully automatic shifting 0.00 Ωm~9000kΩm
Backlight
Controllable gray screen backlight, suitable for use in dim places
Display mode
4-bit large LCD display, gray screen backlight
Measurement instructions
LED flashing indicator during measurement
LCD size
111mm×68mm
LCD display field
108mm×65mm
Instrument size
L/W/H:277.2mm×227.5mm×153mm
Standard test line length
4 strips:red 15m,black 15m, yellow 10m,green 10m each one
Simple test line
2strips:yellow 1.6m,green 1.6m each one
Auxiliary Grounding rod
4PCS:φ10mm×200mm
Measure time
Ground voltage:about 3 times/sec;
grounding resistance,soil resistivity: about 7 seconds/time
Line voltage
Measurement below AC100V (ground voltage measurement function cannot be used to measure commercial power)
USB interface
With USB interface
Communication Line
One USB communication line, 1.5m long
Data storage
500 groups, "MEM" storage indicates, flashing "FULL" symbol indicates that the memory is full
Data review
Data review function: "MR" symbol display
Overflow display
Over-range overflow function: "OL" symbol display
Interference test
Automatic identification of interference signals, "NOISE" symbol indication when the interference voltage is higher than 5V
Auxiliary grounding test
With auxiliary ground resistance test function, 0.00KΩ ~ 30kΩ (Rh max = 3kΩ +100R <50kΩ; Rs max = 3kΩ +100R <50kΩ)
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
Automatic Shutdown
“APO” Indicates, automatic Shutdown After 15 Minutes
Power consumption
Standby: 40mA Max(Backlight off)
Turn on backlight: about 43mA
measuring:75mA Max(Backlight off)
Weight
Instrument: 2450(including battery)
Test lines:1300g
Auxiliary grounding rod: 850g(4PCS)
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 H-E and S-ES ports
Insulation resistance
More than 20MΩ(500V between circuit and housing)
Pressure resistance
AC 3700V/rms(between circuit and housing)
Electromagnetic properties
IEC61326(EMC)
Suitable for safety regulations
IEC61010-1(CAT Ⅲ 300V,CAT IV 150V,pollution level
2);
IEC61010-031;
IEC61557-1(grounding resistance);
IEC61557-5(soil resistivity);
JJG 366-2004.




Details Images




Company Profile


Shenyang Dawan Technology Co., Ltd.
Founded in 2011, Shenyang Dawan Technology Co., Ltd. develops and produces all kinds of measuring instruments and meters in China and sells them all over the world. The company can provide OEM and ODM services. The company's infrared thermal imager and non-contact infrared thermometer and other products have been widely used in various industries and around the world. At the same time, the company is also acting as an agent of famous instruments and meters in China and the world, doing import and export trade and services for China and other countries. The company has a trading company in Hong Kong, offices and R & D centers in Beijing and Shenzhen. It can do R & D, design, production, sales and service of non-standard and special instruments. The company adheres to the business philosophy of "professionalism, integrity, service and cooperation" and wholeheartedly provides users with the best quality products and services. We are willing to cooperate with colleagues from all walks of life around the world for common development!




FAQ


1. Are your company a trading one or a factory?
Factory + trade (integration)
OEM is also acceptable for us.

2. How to choose the most suitable products?
Our professional team will give you the best suggestion as long as you tell us what kind of test you
need to do and the required specification.

3. What’s the delivery term?
Most of the time, we have stock in the factory. If there is no stock, normally, the delivery time is 15-20
working days after deposit receipt. If you are in urgent need, we can consider making a special
arrangement for you.

4. Do you accept customization service?
Yes, of course, we can not only offer standard machines but also customized machines according to
your request. Don’t hesitate to tell us your requirement, we will try our best to meet your needs.

5. Can we visit your factory before the order?
Yes, we warmly welcome and sincerely invite you or your team to visit our factory, we will help to
arrange a hotel and pick up you from the airport.

6.How about the packing for the machine, is it safely protected during transportation?
Our machine is packed by standard export wooden box, it won’t be damaged. We’ve delivered many
testing machines abroad by sea or by air without damage.

7. What is the order process?

Inquiry - quotation - communication - order confirming - deposit payment - production - testing and
debugging - balance payment - packing - delivery - customer receiving - after service.

8.How to install and use the product
The product is shipped with operating instructions and video of the English version.


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