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1 INTRODUCTION
DDC-8 electronic auto-compensation instrument (resistivity meter) is a new model instrument. It is developed by our factory on the basis of many year’s experience in productive resistivity meter and by reference of the advanced technology oversea. The instrument’s transmission and reception are combined in the same case. It can be applicable for various resistivity prospecting methods and displayed the measuring parameters directly, such as apparent resistivity (denoted Rs), the amperage and voltage.
It is widely used in geologic prospecting like hydrogeology, engineering, environmental protection, searching for groundwater to solve the water problem for men and animals, and prospecting using the method of high-resolution resistivity. It is also used for metal and non-metal mineral, energy sources, geothermal, railway and bridge survey and detecting the incipient faults of dam foundations.
2 MAIN FEATURES AND FUNCTIONS
- Small volume and lightweight: the emitting part and reception are combined in the same case.
- Using CMOS IC, smaller size and lower power consumption.
- Multistage filtering, signal-enhance technique and digital filtering are capable of anti-interference and highly measurement accuracy.
- The instrument can automatically compensate for self-potential, drift, and electrode potential.
- Automatic multiple protections for over-voltage and over-current are suitable for all kinds of field operation.
- Setting of power-on time (1-59s) is adjustable free. When working, there are 9 kinds of common working methods to choose.
- Data protection against power failure. The results of the measurement are up to 800 points in the instrument itself.
- Connecting with other computer through a RS-232C I/O interface.
- With the fault diagnosis program, the common fault source can be real-time displayed.
- With totally enclosed frame, it has the advantage of the dust-proof, waterproof and long service life.
3 SPECIFICATIONS
3.1RECEIVER
Measuring range of voltage: ±4V
Measured voltage accuracy: ±1%±1LSB
Input impedance>8 MΩ
Measuring range of current: 4A
Measured current accuracy: ±1%±1LSB
Notch filter to 50HZ is superior to 60dB
SP compensation ranges: ±1V
3.2TRANSMISSION
Maximum supply voltage: 700V
Maximum supply current: 4A ,
Power supply pulse width: 1~59 sec. Take-up to blank ratio is 1:1
3.3WHOLE EQUIPMENT
Working temperature: -10°C~+50°C;
Humidity: 95%RH
Storage working temperature: -20°C~+60°C;
Power supply: Eight 1.5V batteries, size D or rechargeable batteries of equivalent size
Weight: 7 kg
Dimensions: 300×200×120 mm
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