IRIS INSTRUMENTS ELREC Pro 10 CHANNELS IP RECEIVER FOR MINERAL EXPLORATION • 20 programmable chargeability windows • High accuracy and sensitivity • Full wave record ELREC Pro unit with its graphic LCD screen ELREC Pro: this new receiver is a new compact and low consumption unit designed for high productivity Resistivity and Induced Polarization measurements. It features some high capabilities allowing to work in any field conditions. Reception dipoles: the ten dipoles of the ELREC Pro offer an high productivity in the field for dipole-dipole, gradient or extended poly-pole arrays. Programmable windows: beside classical arithmetic and logarithmic modes, ELREC Pro also offers a Cole-Cole mode and a twenty fully programmable windows for a higher flexibility in the definition of the IP decay curve. IP display: chargeability values and IP decay curves can be displayed in real time thanks to the large graphic LCD screen. Before data acquisition, the ELREC Pro can be used as a one channel graphic display, for monitoring the noise level and checking the primary voltage waveform, through a continuous display process. Internal memory: the memory can store up to 44 800 readings, each reading including the full set of parameters characterizing the measurements. The data are stored in flash memories not requiring any lithium battery for safeguard. Switching capability: thanks to extension Switch Pro box(es) connected to the ELREC Pro unit, the 10 reception electrodes can be automatically switched to increase the productivity in-the-field. ull wave record: as an option, the Elrec Pro can record all the samples every ten milliseconds (100 Hz sampling frequency). This allows advanced signal processing, remote reference, correlation with perpendicular dipoles... All data is time stamped, 8 recording hours can be stored in the internal memory ( for one single channel). High resolution for time stamp is available through an external GPS providing PPS signal ( 1 pulse/ sec) . All memory can be transferred to a SD card directly on the field. Display of the full waveform signal Display of numeric values and IP decay curve during acquisit

FIELD LAY-OUT OF AN ELREC PRO UNIT The ELREC Pro unit has to be used with an external transmitter, such as a VIP transmitter. The automatic synchronization (and re-synchronization at each new pulse) with the transmission signal, through a waveform recognition process, gives an high reliability of the measurement. Before starting the measurement, a grounding resistance measuring process is automatically run ; this allows to check that all the electrodes are properly connected to the receiver. Extension Switch Pro box(es), with specific cables, can be connected to the ELREC Pro unit for an automatic...