Magnetic Survey Instruments For deep Geophysical Exploration
Magnetic survey instruments are used to measure the variations in
the Earth's magnetic field caused by geological features such as
mineral deposits, faults, and other subsurface structures. These
instruments work by measuring the strength and direction of the
magnetic field at a specific location.
Standard configuration of WTEM-2 system:
WTEM-2J TEM Exploration System Receiver
WTEM-1D 10kw High-Power Transmitter
WTEM-2T/GPS Transmitter Synchronized Controller
Pocket PC (PDA) to control the TEM system receiver and the system.
Optional instruments:
PTT-40A Antenna & Adapter
WTEM-2J receiver has to work together with a WTEM-1D transmitter to
finish medium-deep or deep sounding; in the mode of GPS
synchronization, a WTEM-2T/GPS synchronized controller is needed to
synchronize WTEM-2J receiver and the transmitter.
PTT-40A Receiver Antenna & Adapter is a specific antenna (or
receiving coil) designed for TEM system receiver, which consists of
an detached antenna and adapter, with large equivalent area and
high signal-to-voice ratio, easy for field layout and free from
limitation of landform.
Techenical Specification
Transmitting voltage | ≤200V3 |
Transmitting current | ≤50A |
Current measurement precision | current range before power supply being cut off is 0~50A, display
resolution is 0.01A. |
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 | 1μs~1000μs |
Turn-off time | ≤1.2μs (pure resistance), changing with the transmitting current
and transmitting coil when connecting to the coils |
Damping resistance | 1000Ω |
Transmitting coil | 0.1km×0.1km single turn ~ 2km×2km single turn |
Synchronization mode | external synchronization (cable, GPS) |
Power supply | internal 12V8.6Ah rechargeable battery (or external 12V power
supply) lasting for over 10 hours |
Dimension | 525×436×217mm3 |
Weight | 18.5kg |
Working temperature | -10°C~+50°C |
| Receiver |
Number of channel | 1 |
Pre-amplification gain | 8, 32 times |
Main amplification gain | 1, 2, 4, 8, 32, 64, 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 | internal 12V9.6Ah rechargeable battery (or external 12V power
supply) lasting for over 10 hours |
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 | 340×295×152mm |
Weight | 5.3kg |
Working temperature | -10°C~+50°C |
Product Image
