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¡¡¡¡WDDS-1 digital
DC resistivity instrument
¡¡¡¡WDDS-1 is a new generation intelligence multi-electrode resistivity
instrument. It can automatically measure and memorize voltage,
current, apparent resistivity, and SP parameter. It is widely
used in the hydrological and engineering survey, such as ground
water seeking; dam base evaluation and flood control dam incipient
fault and so on. It also can be applied in engineering geological
prospecting, such as metal-nonmetal mineral resources exploration,
urban exploration, railway and bridge, even in the geothermal
exploration..
 Features:
- Transmitter and Receiver is all in one, it is portable and
flexible.
- Super storage capability ---- more than 150000 times. (including
voltage, current, resistivity, relative error, SP, array constant,
measuring point and so on)..
- Quality monitoring----- Automatic display electrical resistivity
and relative error between current measuring result and last
measuring result. Memorizing the measuring result and relative
error at the same time..
- Array constant table----Memorizing 30 different array constant,
avoiding repetitive input, input number can invoke polar distance
or reset.
- Grounding electrode check----- Monitor MN electrode potential
dynamic variation with grounding electrode resistivity check.
- Electrode array -----Calculate eight kinds of ordinary constant
of field electrode array automatically, or input special electrode
array constant directly.
- Super-low power consumption -----CMOS large scale integrated
circuit, stand-by current low to 30mA, automatic cut-off when
the stand-by time overtime.
- Automation-----Automatic SP compensation by single-chip
microcomputer (SCM), gain adjustment, filtration and signal
enhancement.
- Safeguards-----Over-voltage protection, over-current protection,
high-voltage opposition protection, AB open-circuit protection,
power-fail protection.
- On-line operation----RS-232 serial interface on-line work
with other microcomputer.
- RS-232C port can communicate with other computers.
- Self-diagnostic function ----- Self-diagnostic function
to fault location and main damage device.
- All sealed constitution---Water-proof, dust-proof, long
life and so on
Technical specifications:
¡¡Transmitter
- Maximum supply voltage: 700V
- Maximum supply current: 3.5A (over-current protection)
- Supply waveform: repeating ON+, ON-
¡¡Receiver
- Input impedance: ¡Ý30M
- Input voltage range: -6V ¡« +6V,¡À1%¡À1
- Delay time: 0.1¡«5s (can be setted by program)
- Automatic SP compensation range: -1 to +1V
- Ground resistance: 0.1 ¡« 200K¦¸¡À3%
- 50Hz industrial frequency pressing:¡Ý60dB
- Current measurement: 3.5A, ¡À1% ¡À1 LSB
¡¡Other
- LCD display: 4 line¡Á20character
- Operating temperature: -10¡æ¡«50¡æ
- Power: eight C size batteries (or same specs nickel-cadmium
battery)
- Power consumption:¡Ü70mA(working) ¡Ü30mA(stand-by)
- Weight: 6Kg
- Dimensions (L¡ÁW¡ÁH): 240mm¡Á170mm¡Á160mm
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