NADWG Series Substation Ground Resistance Tester
Product introduction
NADWG Series Substation ground resistance tester can test grounding impedance, the contact voltage, step voltage, the diverting potential of all kinds grounding device, and the potential gradient field of surface parameters such as frequency and soil resistivity. NADWG Series Substation ground resistance tester uses different frequency interference technology, strong interference environment can be measured accurately the data frequency 50Hz. Test current is (0 ~ 3.0A), does not improve potential of grounding device, but it also has strong anti-interference ability, it can measurement without the power cut.
Also called name
Ground network earth resistance tester, Ground Resistance Tester, Earth Ground Resistance Tester, Grounding Resistance Tester, NADWG Series Substation Ground Resistance Tester
The Characteristics of the products 
1、Good measurement of power frequency equivalence. Test current waveform is a sine and two frequencies used in measurement.
2、Anti-interference ability ground voltage. The instrument uses different frequency measurement, with modern hardware and software filtering technology, making the instrument has a very high anti-jamming performance, stable and reliable test data. 15V power frequency (50Hz) interference voltage error caused only 0.001Ω.
3、High precision. Used to measure ground impedance small large ground network.
4、And powerful. Measurable standards prescribed all the features of the grounding device parameters. Not only measure ground impedance, also measure the resistance component and the reactance component.
5、With the break alarm function, to avoid erroneous measurements.
6、Simple operation. Full English menu operation, directly showing the measurement results, and comes with mini printer can print on-site measurements.
7、The wiring labor is small, no large current line.
8、Small size, light weight, easy to carry.
The parameters of the products

Project parameters	Model
	NADWG-3A Substation Ground Resistance Tester		NADWG-5A Substation Ground Resistance Tester		NADWG-5B Substation Ground Resistance Tester
An impedance measuring range	0～15Ω		0～50Ω		0～5000Ω
Resolution	0.001Ω				0.001mΩ
The measurement error	±（reading×1% + 0.001Ω）		±（reading×2 % + 0.005Ω）		±（reading×2 % + 0.01Ω）
Hnti-interference  ability of ground voltage	15V power frequency interference  voltage error caused only 0.001Ω		Anti-frequency： 50Hz Interference voltage: 10V		Anti-frequency： 50Hz Interference voltage: 10V
The test current waveforms	sine		sine		sine
The test current frequency	-		45Hz、55Hz dual-frequency		45Hz、50Hz、55Hz、60Hz、65Hz Single Frequency; 45/55Hz、55/65Hz、47.5/52.5Hz Automatic dual-frequency
The output current	0～3.0A		0～5.0A		1A、2A、3A、4A、5.0A
The output voltage	0～100V		0～420V		0～400V
The measurement  line requirements	The sectional area of copper  core of current lines ≥1.0mm2		The sectional area of copper  core of current lines ≥1.5mm2		The sectional area of copper  core of current lines ≥1.5mm2
	The sectional area of copper core  of voltage lines≥0.2mm2		The sectional area of copper core  of voltage lines≥1.0mm2		The sectional area of copper core  of voltage lines≥1.0mm2
Power supply	AC220V±10%，50Hz				AC180～220V，50/60Hz
Use of the environment	Temperature：-10℃～50℃；Relative humidity：<90%
Dimension	440mm×350mm×310mm	440mm×350mm×210mm		320mm×285mm×285mm
Weight	6.0kg	18kg		18kg