Induced Polarization Transmitters

Reliable and robust, the GDD IP Transmitters (models TxIII, TxII and Tx4) are used over the world for apparent resistivity and time-domain induced polarization (IP) surveys and drilling.


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  • Resistivity and time domain IP survey
  • User friendly and robust
  • Shock resistant and environmentally sealed
  • Protection against short circuits even at zero (0) ohms
  • Displays electrode contact, transmitting power and current
  • Applications: mining exploration, groundwater exploration, geotechnical investigations and other related fields

Model TxIII


Model TxII


Model Tx4





Master-Slave configuration (2 Transmitters)




Specifications (per Transmitter)

Total weight (including accessories and shipping box)

39 kg

44 kg

58 kg

Weight (transmitter only)

27 kg

32 kg

40 kg

Total dimension (including accessories and shipping box)

56 x 36 x 56 cm

28 x 49 x 70 cm

34 x 52 x 76 cm

Operating temperature

-40° C to +65° C
(-40° F to +150° F)

Electrical characteristics

Time base

Time domain: ON+, OFF, ON-, OFF
Time base: DC, 1, 2, 4, 8 et 16 seconds

Output current

0.030A to 20A (standard operation)
0.0A to 20A (Open Loop protection disabled)

DC mode

Maximum of 5A

Output voltage

150V to 2400V / 14 voltage scales

Master-Slave configuration

Ability to link 2 GDD IP Transmitters of 3,600W or 5,000W to double power (7,200W or 10,000W) and the output voltage up to 4,800V

LCD display

- Output current 0.001A resolution
- Output power
- Ground resistance (when the transmitter is turned off, but plugged to the generator)

Power source

Standard 110-120V / 50-60Hz
(optional : 220-240V / 50-60Hz)

Standard 220-240V / 50-60Hz

Optional accessories

  • Wire roll
  • Electrode

Continuous improvement

Tx-Master-Slave-Configuration-200px In 2017, GDD has launched its new model: Tx4. This digital IP transmitter gives a much more accurate and stable current reading.

Reliability of GDD IP Transmitters has been highly improved in 2010. Since the beginning of May 2010, GDD has started to introduce new electronic boards that increase the reliability of the latest GDD IP transmitter especially at high voltage (4,800 V). Moreover, GDD now installs a bigger fan and a new vent pipe with dust filter in order to reduce breakdowns caused by moisture and dust accumulated on the boards.

For safety issues, GDD installs a new red push button (ON / OFF Switch) and a proper grounding to improve the insulation of the Pelican case.

Plus, a new time base of 16 seconds and a new optimized control panel were added to the GDD IP Transmitter in 2014.

All GDD new transmitters have these new features and the old ones can be upgraded on request. 


Buy or rent this Instrument

Contact Us

Phone: +1(418) 478-5469

Monday thru Friday. 9 AM to 5 PM. (Eastern Time (EST)/New York)


Instrumentation GDD
1963 rue Frank-Carrel
Suite 203
Quebec (Qc) CANADA
G1N 2E6

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