ASTRA

CURRENT SOURCE FOR GEOPHYSICAL TECHNIQUES

Geoelectric transmitter «ASTRA» is designed to create electromagnetic field during geophysical surveys by means of direct current resistivity, induced polarization, frequency-domain (using separate component or impedance measurements) and other electromagnetic methods. The transmitter can be applied to solve only civil tasks, connected with the study of electrical properties of soils and rocks. None of the components of the transmitter or technical ideas are confidential. The exploitation of the transmitter does not lead to negative ecological consequences.

Max. Output capacity 100 W
Max. Output Voltage 250 V
Values of the output current and corresponding resistance range RAB 1.00 mA, 5.0 – 250 kOhm
3.16 mA, 1.5 – 80 kOhm
10.0 mA, 0.5 – 25 kOhm
31.6 mA, 150 – 8000 kOhm
100 mA, 50 – 2500 kOhm
316 mA, 15 – 800 kOhm
1000 mA, 5 – 100 kOhm
Form of output current “meander” (rectangular of different polar impulse without pause)
Work frequencies: The first series of frequencies:
0.076, 0.153, 0.305, 0.610, 1.22, 2.44, 4.88, 9.77, 19.5, 39.1, 78.1, 156, 313, 625, 1250, 2500 Hz
The second series of frequencies:
0.042, 0.063, 0.083, 0.125, 0.167, 0.250, 0.333, 0.500, 0.667, 1.00, 1.33, 2.00, 2.67, 4.00, 5.33, 8.00, 10.7, 16.0, 21.3, 32.0, 42.7, 64.0, 85.3, 128, 171, 256, 341, 512, 683, 1024, 1365, 2048 Hz
Efficiency factor To 80 %
The mistake of the stabilization on the active load 0.5 %
Duration of the front on the active load 2 ms
The range of the work temperature from – 20°C to + 50°C
Supply voltage ~ 12 V (min 9.5 V, max 15.5 V)
Weight (without accumulator) ~ 2 kg
Dimension 200 x 173 x 113 mm
Textual liquid-crystal panel 4 lines x 16 symbols
Textual indication – work frequence
– the value of output current
– the voltage of the accumulator
– status (wait, work, break in AB, low supply voltage)
– resistance of the load
– output voltage
Sound indication – work- break in AB
– low supply voltage
Keyboard 12 button
Cutoff point – AB
– shunt 1 kOhm
– synchronization
– power supply
Waterproof case
  • Download PDF FileDownload Specifications

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