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 |
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