WTEM-3Q Electromagnetic Sounding System(TDEM)

WTEM-3Q time-domain shallow transient electromagnetic sounding system is our latest equipment developed for magnetic survey by TEM method, which integrated with WTEM-1J/GPS TEM system receiver and WTEM-1X low-power TEM system transmitter. It features high transmitting power, short turn-off time, high reliability, strong anti-interference performance (atmospherics, 50Hz or 60Hz industrial frequency interference), lightweight and low power consumption. According to different geological situations, it applys for different geopysical magnetic survey as quick general magnetic mapping, 3D graph coloring up, stereo mapping, mining source exploration and shallow sounding, groundwater or geothermal inverstigation and so on.


•   Geothermal investigation
•   Metal mine, coalmine
•   Oil and gas field, geothermal field
•   Hydrology investigation
•   Engineering geological prospecting

Main features:

•   One instrument with multiple functions: this system is integrated with functions of a transmitter and a receiver, portable and simple in connection. The receiver alone could synchronize though cable, GPS and thus associated with the external high-power transmitter to fulfill deep exploration.




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•   High reliability, low power consumption: refined receiver and circuitry, reasonable heat dissipating system design, sealed and rugged mechanical structure, ensuring high reliability, low power consumption and convenient operation.
•   Remote control: PDA based Bluetooth wireless communication technology enables it to control the receiver in 10 meters, such as setting parameters, starting measuring, transferring and displaying the measured results.
•   High anti-interference performance: program controls the filter to give accurate power supply frequency; besides, data stacking and software filtration also do good to this performance.
•   Multiple channels, high measurement accuracy: operator could set number of channel, linear or logarithmic; crystal oscillator accomplishes timing, with stable anto enable it to give accurate data.
•   Wide depth range prospecting: this system is equipped with high-power transmitter which could reach in meters to thousands of meters (deep exploration)
•   Friendly and powerful control interface: PDA controls and collects data from human-machine interface, such as parameters input, data display or storage, graph plotting, etc, simplifying fieldwork.
•   Short turn-off time: transmitter supports swift turn-off function, able to extend shallow exploration range. Short turn-off function provides software with accurate turn-off time 


Technical specification:

Number of channel   1
Pre-amplification gain 8, 32 times
Main amplification gain 1, 2, 4, 8, 16, 32, 64, 128 times
Band-pass 0~50k Hz (linear phased filter), full band-pass 0~400k Hz
Suppression ≥80dB
A/D 16bit
Min sampling interval 1μs
Crystal oscillation frequency error ≤5×10-9
Trace number ≤128
Stacking times 1~9999 time
Synchronization mode cable, GPS, GPS+Quartz clock
Power source Built-in 12V rechargeable battery lasting for over 10 hours.
Tablet PC Window 10 tablet PC
Ports Bluetooth, infrared and serial

Transmitting voltage input 12V, 24V
Transmitting voltage 2.5V~ 8V (transmitting voltage input 12V), adjustable;
or 5.5V~20V (transmitting voltage input 24V), adjustable
Transmitting current        ≤10A
Current precision          ±1%
Power supply frequencies a. 0.25Hz, 0.5Hz, 1Hz, 2Hz, 4Hz, 8Hz, 16Hz, 32Hz
b. 0.3Hz, 0.75Hz, 3Hz, 7.5Hz, 30Hz, 75Hz, 285Hz
c. 0.25Hz, 0.625Hz, 2.5Hz, 6.25Hz, 25Hz, 62.5Hz, 273.5Hz
Transmitting waveform +ON, OFF, -ON, OFF, equal width and dual polarity
Turn-off time range 1μs ~ 100.0μs
Turn-off time ≤2.5μs (when transmitting current is 3A), transmitting coil is single-turn 40m×40m
Transmitting coil 5m * 5m single turn ~ 100m * 100m single turn
Programmable damping resistance 50Ω ~ 1600Ω, 50Ω step programmable 
Synchronization mode external synchronization (cable)

Battery recharging charging voltage 12V, charging current ≤1.5A, for no more than 6 hours (automatically monitored)
Dimension 486mm * 392mm * 192 mm
Storage temperature -20°C ~ +70°C
Weight 6kg
Working temperature -10°C ~ +50°C


WTEM-2Q transient electromagnetic system for geothermal investigation
             TD EM systemtransient electromagnetic system for groundwater investigation
TEM apparent resistivity pseudosection of a dam foundation in Yunan   Transient electromagnetic system in Mexico


In order to ensure the safety of customers, our sales department only keeps the following email addresses:

- Sales@langeoinstrument.com
- Emily.chou@langeoinstrument.com
Other mailboxes are unofficial, please note.