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TEM 67 Deep Sounding TEM Transmitter

  • Used to sound to depths greater than I kilometer.
  • In the large fixed loop profiling mode, the unit detects and delineates ore bodies at several hundred meters depth.
  • Powered by a specialized motor-generator that can energize loops up to 2000 x 2000m in size.
  • The ability to profile deeply buried conductors makes the system a principal tool of mineral exploration.
  • Widespread application performing deep soundings for groundwater exploration, mapping saline intrusion, and for geothermal exploration.
  • Used in regional geological research where structures and layers can be detected at depths greater them 1000m.


The TEM 67 transmitter is the most powerful Protem transmitter, replacing the TEM37. Not only is the TEM67 more powerful than the TEM37 (3,800 watts as compared to 2,800 watts for the TEM37), but the TEM67 offers a degree of flexibility not previously available in time domain transmitters; The TEM67 uses the TEM57-MK2 transmitter with a separate power module and larger generator (3,500 watts). This means that one can upgrade from the TEM57-MK2 with the addition of a TEM67 power module and generator. Conversely, if the full power of the TEM67 is not required for a particular survey, much of the weight can be eliminated by using only the TEM57-MK2 portion.

The Protem 67 system with the 3D receiver coil is the ideal time domain system for profiling deeply buried conductive ore bodies, such as massive sulphides, to depths in excess of 500 meters, and with the 3-axis BH43-3 borehole probe for time domain logging to 2 kilometers.

The Protem 67 is also ideal for deep soundings in ground water exploration, saline intrusion mapping, geothermal exploration, and regional geological research where structures and layer information is required to depths of 1,000 meters or more.


0.3, 0.75, 3, 7.5, or 30Hz (powerline frequency 60Hz).
0.25, 0.625, 2.5, 6.25 or 25Hz (powerline frequency 50Hz).
Rates below 1Hz: Available from Protem receiver through reference cable
Current Waveform: Bipolar rectangular current with 50% duty cycle
Turn-Off Time: 20 to 750lls, depending on size, current and number of turns in transmitter loop
Transmitter Loop: Up to 2000 x 2000m, minimum resistance = 0.67
Output Current: 25 A maximum Output Voltage: 18 tp 150 V continously adjustable
Synchronization: Quartz crystal or optional reference cable
Motor Generator: 3,500U: 115V, or 220V 50/60Hz single phase with 8 hrs. continuous operation from full fuel-tank
Transmitter Protecffon: Electronic and electromechanical protection against short circuit
Transmitter Wire: AWG #10 copper insulated with PVC
Transmitter Size: 43 x 25 x 25cm (TEM57-MK2); 42 x 20 x 31cm (TEM67 Power Module)
Transmitter Weight: 15kg  (TEM57-MK2); 12kg (TEM67 Power Module)
Motor-Generator Size: 60 x 50 x 49cm
Motor Generator Weight: 62kg

Standard Components

Transmitter, shipping case, generator and instruction manual.