WDDS-3C Digital Resistivity Meter | Geotech Instrument Co., Ltd.

PRODUCT PARAMETERS

Tuursmitter and receiver designed in one unit.
Large power up to 6000W, 50V wide voltage input range.
Automatic compensation of self-potential, drift and electrode polarization .
Monitoring the dynamic variation of MN electrode potential through inspecting its ground resistance.
Receiver supports transient over-voltage protection; transmitter supports overvoltage, over-current and AB open-circuit protections.
Internal 12V lithum battery for 20 hours contiously work.
Communicated by USB port.
Store measuring data for more than 150,000 times.
Measuring data includs voltage, current, resistivity, relative error, SP, array constant, measuring point and so on.

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Description

FAQ

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Description

Abstract

The WDDS-3C digital resistivity meter is an advanced DC resistivity equipment. It incorporates 32-bit microcontroller technology and 24-bit A/D technology, making it a cutting-edge solution for resistivity surveys. This versatile instrument is suitable for various applications including mineral resource detection, geophysical exploration in urban areas, railway and bridge inspections, hydrology, engineering geology, and geothermal prospecting. It enables precise detection of metal and nonmetal resources, groundwater exploration, fault identification in dam bases and flood protection levees, and more.

Working principle

The electrical resistivity method is an active geophysical technique. It employs an artificial source which is introduced into the ground though a pair of electrodes. The procedure involves measurement of potential difference between other two electrodes in the vicinity of current flow. Apparent resistivity is calculated by using the potential difference for the interpretation. These electrodes by which current is introduced into the ground are called Current electrodes and electrodes between which the potential difference is measured are called Potential electrodes.

Applications

● Metal and nonmetal mineral resources detection

● City geophysical exploration, railway and bridge inspection and so on

● Hydrology and engineering geology as seeking for ground water, inspecting dam base and flood protection levee for incipient faults

● Geothermal prospecting

Features

● Tuursmitter and receiver designed in one unit.

● Large power up to 6000W, 50V wide voltage input range.

● Automatic compensation of self-potential, drift and electrode polarization .

● Monitoring the dynamic variation of MN electrode potential through inspecting its ground resistance.

● Receiver supports transient over-voltage protection; transmitter supports overvoltage, over-current and AB open-circuit protections.

● Internal 12V lithum battery for 20 hours contiously work.

● Communicated by USB port.

● Store measuring data for more than 150,000 times.

● Measuring data includs voltage, current, resistivity, relative error, SP, array constant, measuring point and so on.

Specifications

Receiving section

Item	Parameters
Voltage channel	±50V, ±0.2% ±1LSB, 24-bit A/D
Maximum sampling resolution of voltage	0.01μV
Input impedance	≥50MΩ
SP compensation range	±10V
Current channel	5A, ±0.2% ±1LSB, 24-bit A/D
Maximum sampling resolution of current	0.02μA
Suppression	≥80dB for 50Hz industrial frequency (common mode interference or differential mode interference)

Transmitter

Item	Parameters
Transmit power	6000W
Power supply voltage	±1200V (2400Vp-p)
Power supply current	±5A (7Ap-p)
Power supply pulse waveform	Duty cycle is 1:1, bipolar

Other parameters

Item	Parameters
Instrument power source	Built-in 7.4V and 48V lithium battery (or external 12V power supply)
Mainframe interface	A, B, M, N, DC high voltage, external battery, charger, Bluetooth, and USB
Built-in high-voltage power supply	Max current: 300mA, voltage options: 50V, 100V, 150V, 200V
Working temperature	-10℃ ~ +50℃, 95% RH
Storage temperature	-20℃ ~ +60℃
Weight	≤5.7 Kg
Dimensions (L×W×H)	350mm x 270mm x 200mm

Case Study

Electrical Resistivity Imaging Method for Evaluate Estuarine Impace on Groundwater Salinization in Pondicherry Coastal Aquifers

Recording Readings during the Field Survey

FAQ

In gravity exploration (SI), what is the unit of gravity? How to convert gravity units between SI and CGS?

What are gravitational field and gravitational potential?

What is the normal gravity field of the earth? What are the rules for the change of the normal gravity field with latitude and altitude?

① The normal gravity field of the earth: Assuming that the earth is a rotating ellipsoid (reference plane), the surface is glossy, the internal density is uniform, or it is distributed in concentric layers, the density of each layer is uniform, and the deviation of the shape of the ellipsoid from the geoid is very small, then the gravity field generated by the earth is the normal gravity field.
② The normal gravity value is only related to the latitude, the smallest at the equator and the largest at the poles, with a difference of about 50,000 g.u.; the rate of change of the normal gravity value with latitude is the largest at 45° latitude, and zero at the equator and the poles; the normal gravity value decreases with increasing altitude, and its rate of change is -3.086 g.u.. The main feature of the long-term change is the "westward drift" of the geomagnetic elements, both the dipole field and the non-dipole field drift westward, and have a global nature.

What is the relationship between gravitational field strength and gravitational acceleration?

What is gravity exploration?