WTEM-2 Deep Transient Electromagnetic System
WTEM-2 Medium-Deep/Deep Time Domain TEM Exploraiton System is applicable to medium-deep/deep transient electromagnetic sounding exploration. It features high power, short turn off time, high reliability, strong anti-interference performance, lightweight and low power consumption. The system composed of WTEM-2J TEM Exploration System Receiver, WTEM-2D/60 High-power Transmitter, WTEM-2T/GPS Transmitter Synchronized Controller, the PTT-40A Antenna & Adapter and one Touch pad.
| * WTEM-2J Receiver |
| * WTEM-2D/60 Transmitter |
| * WTEM-2T/GPS Transmitter Synchronized Controller |
| * Touch pad to control the TEM system |
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Optional instrument: |
| * PTT-40A Antenna & Adapter |
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| • Improved WTEM-2T/GPS transmitter synchronized controller: a better GPS module and antenna of higher sensibility is integrated, faster in synchronization speed, compacter in size and lighter in weight. |
| • High reliability, low power consumption: refined receiver and circuitry, sealed and rugged mechanical structure, ensuring high reliability, low power consumption and convenient operation. |
| • Remote control: it is the first receivers that take use of a pocket PC and Bluetooth wireless communication technology which enable it to control the WTEM-2J receiver 10 meters, such as setting up parameters, starting measuring, transferring and displaying the measured results. |
| • Multiple channels, high measurement accuracy: operator could set number of channel, linear or logarithmic; crystal oscillator accomplishes timing, with stable and precise time-to-depth ratio. Sampling window arrangement is reasonable, imaging the true subsurface structure. It provides references to complex geological problems. |
| • Short turn-off time: transmitter support swift turn-off function, able to extend shallow exploration range. Short turn-off function provides software with accurate turn- off time to enable it to give accurate data. |
| • Friendly and powerful control interface: PDA control and collects data from human-machine interface, such as parameters input, data display or storage, graph plotting, etc, simplifying fieldwork. |
| WTEM-2D/60 Transmitter | |
| Transmitting voltage | 12V～200 V DC |
| Transmitting current | ≤60A |
| Current measurement precision | ±1% |
| Power supply frequencies | 0.0625Hz, 0.125Hz, 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz |
| Transmitting waveform | +ON, OFF, -ON, OFF, equal width and dual polarity |
| Turn-off delay time | 160ns (Pure resistance load) |
| Damping resistance | 1000Ω |
| Transmitting coil | 0.1km* 0.1km single turn ~ 2km*2km single turn |
| Synchronization mode | external synchronization (cable, GPS, Quartz clock) |
| Power supply | internal 12V8.6Ah rechargeable battery (or external 12V power supply) lasting for over 8 hours |
| Dimension | 486 * 392 * 192 mm |
| Weight | 12.7kg |
| Working temperature | -10°C~+50°C |
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WTEM-2J Receiver |
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| Number of channel | 1 |
| Pre-amplification gain | 32 times |
| Main amplification gain | 128 times |
| Band-pass | 0~50k Hz (liner phased filter), full band-pass 0~400k Hz |
| Suppression | 80dB |
| A/D | 16 bit |
| Min sample interval | 1μs |
| Trace number | ≤128 |
| Stacking times | 1~9999 time |
| Synchronization mode | cable, GPS, GPS+quartz clock |
| Power source | internal 12V rechargeable battery (or external 12V power supply) lasting for about 16 hours work |
| Pocket PC | Windows Mobile 6.0 system with software such as Word, Excel, etc., 320x240 true color, 64MB Flash Rom/ 64MB SDRAM/64MB 2GB CF card, able to store over 200,000 readings of sampled data,2 original rechargeable batteries |
| Ports | Bluetooth, infrared and serial port |
| Dimension | 340mm* 295mm *152mm |
| Weight | 5.3kg |
| Working temperature | -10℃~+50℃ |
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WTEM-2T/GPS Transmitter Synchronized Controller |
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- Fast synchronization. - Synchronization accuracy is high, synchronization error is less than 250ns. - Supports multiple control signal frequencies. - Real-time satellite signal display. |
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| Power source | Built-in high-capacity lithium battery, working time ≥ 20 hours. |
| Volume | 270mm * 246mm * 123mm |
| Weight | 2.5kg |
 Tansmitting System of WTEM-2 GPS TEM system ( 12v car battery is not in standard configuration) |
 1200m depth TEM apparent resistivity pseudosection for geothermal inverstigation in Tengchong of Yunnan |
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