WDA-1 IP Sounding Meter

WDA-1 DC Electrical Resistivity IP Sounding Meter

WDA-1 super digital DC resistivity/IP meter, is a newly developed electricalmethod instrument, adopting many advanced technologies such as tablet PC, Bluetooth,24bit A/D, and high power control. WDA-1 is specific instrument for the variousgeophysical explorations, with the most parameters, various funcitons, and the mostadvanced performance at present.

Working principle

Electrical prospecting is a group of geophysical prospecting methods that use the electrical properties of rocks and ores (such as conductivity, electrochemical activity, magnetic conductivity and dielectric properties, the so-called “electrical differences”) to find minerals and study geological structures. It uses instruments to observe artificial and natural electric fields or alternating electromagnetic fields, analyze and interpret the characteristics and laws of these fields to achieve the purpose of prospecting.

Vertical electrical sounding (VES) is a geophysical method for investigation of a geological medium. The method is based on the estimation of the electrical conductivity or resistivity of the medium. The estimation is performed based on the measurement of voltage of electrical field induced by the distant grounded electrodes (current electrodes).

Applications

●Energy resource exploration

●City geophysical exploration

●Railway and bridge prospecting

●Metal and non-metal mineral resources prospecting

●City geophysical exploration

●Hydrology and engineering geology to inspect base of dam

●Flood protection levee for incipient faults

Features

●Unique and open measuring process control

●Measuring various parameters, wide application

●High power supply, wide current range, high accuracy

●Bluetooth technology facilitating wireless remote control

●extending data storage capacity and collection software functions

Detailed description

WDA-1 can works with intelligent cable system for multi-electrode 2D/3D Resistivity/IP imaging survey.

● The transmitter and the receiver are designed in one unit, portable and light. The 200V internal transmitting power of WDA-1 can conduct Res survey in wide variety of explorations.

● It is available to measure data of voltage (VP), current (IP), apparent resistivity (ρS), Self-Potential (SP), apparent polarizability (M~M7), metal factor (G1~G7), half decay time (TH), deviation (r), induce polarization ratio (J) and voltage decay curve, etc.

● Max power up to 9000W (1500V*6A), voltage input range is 160Vp-p, high measuring precision of small signal.

● Bluetooth technology enables the tablet PC to control the WDA-1 mainframe in 10 meters.

● Data collecting and data storage are controlled by tablet PC. Software is flexible to be upgraded and extended.

● Integrated with multistage filtration and signal enhancement technologies and suppression against common mode interference and differential mode interference. Measurement precision is high.

● Transmitting unit supports over-voltage protection, over-current protection and AB open-circuit protection as well as DC high voltage reverse connection protection.

Specifications

Receiving section

Item	Parameters
Voltage	±32V (24 bit A/D). If Vp≥5mV, accuracy is ±0.2% ±1LSB If 0.1mV≤Vp<5mV, accuracy is ±1% ±1LSB
Apparent polarizability measurement accuracy	±0.2%±1LSB
Input impedance	＞50MΩ
SP compensation range	±10V
Maximum supply current	6A (24bit A/D with WDZJ-3, no more than 2.5A) If Ip≥5mA, accuracy is ±0.2% ±1LSB If 0.1mA≤Ip<5mA, accuracy is ±1% ±1LSB
Suppression	For 50Hz industrial frequency interference (common mode and differential mode interference), suppression is more than 80dB.

Transmitter

Item	Parameters
Maximum transmitting power	9000W
Maximum supply voltage	1500V (with WDZJ-3, no more than 450V)
Supply current	6A
Transmitting power pulse width	1~60s, duty cycle is 1:1

Other parameters

Item	Parameters
Power supply	Internal 7.4V 4Ah rechargeable battery continuously lasts for 20 hours (or 12V external power supply).
Ports support (transmitting unit)	A, B, M and N connecting ports, DC high voltage input ports and external battery terminals, 2 cable ports, RS-232, Bluetooth.
Working temperature	-10℃~+50℃, 95%RH
Storage temperature	-20℃~+60℃
Weight	≤4kg
Dimension	270mmx246mmx123mm
Internal power source	Mximum voltage 96V (two notches, 48V and 96V); Maximum current is 0.7A