Geophysical Transmitter: TXM-22
Supplied By: Metronix Geophysics, Germany
TXM-22 & TXB-07: 22 kW Geophysical Transmitter and Transmitter Control Box
The TXM-22 is a highly efficient multi-purpose geophysical power source. It is designed for use in connection with the TXB-07 controller unit. The TXM-22 and TXB-07 form a powerful and flexible transmitter for geophysical applications such as Controlled Source Audio Magnetotellurics (CSAMT), Controlled Source Electro magnetics (CSEM) or Long Offset Transient Electromagnetics (LOTEM).
It can be operated in a wide frequency range between 0.001 Hz and 8,192 Hz. The output current is adjustable up to a maximum of +/-40A. The nominal output voltage is +/-560V.
The TXM-22 is powered by a 50/60Hz, 3-phase, 400V generator. In order to unleash the full capabilities of the system, a generator of min. 40kVA should be used.
The transmitter outputs are connected to 3 electrodes, thus offering the possibility to rotate the current vector in any direction. The TXB-22 uses a Pulse-Width Modulation (PWM) to control the transmitted currents. By this means it is possible to create different output waveforms such as sine wave, square wave, triangle, sawtooth, Pseudo Random Binary Sequences (PRBS) or other user definable signals. For frequencies higher than 2048 Hz the TXM-22 will transmit a square wave only.
The controller unit TXB-07 synchronizes the TXM-22 in reference to the GPS time signal. The parametrization is done with a laptop or a touch-screen computer connected to the controller box. Optionally, it is possible to record the time series of the three injected currents.
The user friendly control software provides a comfortable access to all relevant control parameters of the TXM-22.
Frequency range from 1mHz to 8192Hz
Current vector can be rotated freely due to 3 electrode output
Predefined or user programmable waveforms
Automatic execution of job lists
Recording of the 3 output currents with 24Bit A/D conversion (option)
Synchronization by GPS timing signal
Automatic system self-check during start-up
Control via W-LAN or LAN with external computer
User friendly control software
|TXM-22 Technical Specifications
|1/1024sec to 8,192Hz
|3 phase 50/60 Hz, 400V, socket IEC60309 32A red
|± 560V (1120V peak to peak)
|Max Output Current
|± 40A (80A peak to peak)
|Grounded dipole or loop
|Transmitter signal wave forms
|Square wave, sine wave, triangle, sawtooth, PRBS, user defined with up to 2048 set points
|By TXB-07 transmitter controller via cable with 19-pole Mil connector
|Aluminum case 19”
|480mm x 514mm x 354mm
|Ambient Temperature Range
|0°C to +40°C non condensing
|TXB-07 Technical Specifications
|Interconnection to TXM-22
|Cable with 19 pin connector galvanically decoupled
|By external laptop or touchscreen computer via W-LAN or LAN
|Ratio for current measurement
|24 Bit with up to 65,536 samples per second
|Compact flash or USB stick
|Ambient temperature range
|-30°C to +60°C
|406mm x 330mm x 174mm
|By TXM-22 or external 12V battery
|Ruggedized waterproof plastic case