Helicopter Electromagnetic (VTEM™ AND ZTEM™) Applications ...
Apr 01, 2015· The VTEM™ system has been primarily designed for mineral exploration. Its low base operating frequency – standard is 30 or 25 Hz time base operation in countries with 60 or 50 Hz power lines – and long ontime ( to – Figure 2) pulse and BField data to detect and resolve high conductance targets.