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DW257 Multi-function ground resistance tester can test low resistance and resistivity

category： Resistance Meters

reference price：￥$481.00

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Shenyang Dawan Technology Co., Ltd.

Mr. chang
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Product details Company introduction
Parameter information
Products Description
Ground resistance tester
Function: two or four line measurement of ground resistance, soil resistivity, ground voltage, AC voltage measurement
Four-wire digital grounding resistance tester
Using large LCD screen backlight display and microprocessor technology, the instrument is accurate, fast, simple, stable and reliable, etc
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
Field application
Soil resistivity tester
Four-wire precision test ground resistance
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.