WDJD-3 mutil-function digital DC resistivity induced polarization instrument

　The instrument is a new generation DC electric method instrument developed by combining Chinese situation and referring to other advanced electric instrument of foreign countries. It is based on our design and manufacture experience of many years, and we consider user's latest needs. It is of mutil-function, high accuracy, high speed, high reliability and other excellent function of extension. The instrument can be extensively applied in metal and nonmetal mineral resources detection, city geophysical exploration, railway and bridge exploration, and other application. It is also applied in hydrologic geology and engineering geology such as searching for ground water, locate the base of a dam and hidden trouble of flood protection levee, and can still used for geothermal prospecting.

Features:

• Transmitter and Receiver all in one, lightweight and convenience.

• CMOS Large-scale integrated circuit, special stand-by mode, small volume, low power consumption, muti-function

• Cut off power automatically if no operation in 10 minutes.

• Versatility: general electric method and multi-electrode resistivity electric survey by WDZJ-3 multiplexing electrode converter, data do not interfere each other.

• Fast and precise: with the precondition good data repetition, multi-electrode cross-section with 552 measuring points is no longer than 25 minutes.

• Strong anti-interference and high precision with multilevel filter and signal amplification.

• Compensating self-potential, drift and electrode polarization automatically
  Receiver has transient over-voltage protection, transmitter has over-voltage, over-current and AB open circuit protection.

• Measured curve can be plotted on the display directly and concisely.

• Large display, Chinese character keyboard, Chinese menu, flexibility of operation.

• Simple calculator can calculate field array factor on the spot and other routine calculation.

• Setting working period arbitrarily, 9 kinds of common field working methods can be chosen, array constant can be inputted and calculated.

• Array constant table----memorizing 100 different array constant, avoiding repetitive input, input number can invoke polar distance or reset.

• Ground-resistance inspection----ground condition can be inspected at any time, operation is flexible.

• Mass data storage----memorizing 3500 survey station data for electrical resistivity and free mode,2500 survey station data for induced polarization, 43680 electrical resistivity data for multi-electrode electrical resistivity surveying.

• All parameter and data are power-cut protected, data can not be lost when closedown or changing battery.

• RS-232C port can communicate with other computers.

• Ascertaining fault location and damaged parts accurately by diagnostic program.

• All sealed constitution----water-proof and dust-proof design, long life and other virtue.

Technical specifications:

　Receiving part

• Voltage channel: ± 6 V

• Survey precision: if Vp≥10 mV then ± 5‰ ± 1 LSB, if Vp < 10 mV, then ±1% ± 1 LSB

• Input impedance: ≥50MΩ

• Apparent polarizability precision: ±1% ± 1 LSB

• SP compensation range: ±1 V

• Current channel: 5 A, survey precision: if IP≥ 10mA then ± 5‰ ± 1 LSB, if IP < 10 mA, then ±1% ± 1 LSB

• Suppression: ≥80dB for 50Hz industrial frequency

　Transmitter part

• Voltage maximum: 900V

• Current maximum: 5A( when voltage ≤ 900V )

• Pulse width: 1～ 60s, duty ratio 1:1

　Other

• Operating temperature: -10℃～50℃, humidity: 95 %RH

• Memory temperature: -20℃～50℃

• Instrument power: eight D size batteries (or same specs nickel-cadmium battery)

• Complete appliance current: ≤ 55mA

• Weight: ≤ 7 Kg

• Dimensions (L×W×H): 310mm X 210mm X 210mm