Electromagnetic EM and Resistivity Sounding

Geotech ERA-MAX ELECTROMAGNETIC AND RESISTIVITY SURVEYING SYSTEM

ERA-MAX equipment is designed for electrical prospecting on any surface

Features

•Low-frequency electromagnetic method for measuring resistivity

•Operating frequencies: DC, 1.22, 2.44, 4.88, 9.76, 19.52 and 625, 1250, 2500 Hz

•Electrical field can be measured by pairs of active electrodes capacitively coupled to the earth, or by the telescopic antenna in air

Applications

•Civil-engineering survey for construction and inspection of active pipelines, roads, hydraulic facilities

•Search and exploration for ore and nonmetallic minerals

•Ecology, archeology

•Inspection of house footing and urban underground utilities

Survey methods

•Electrical exploration – resistivity method (vertical electrical sounding profiling)

•Charge method

•Self-potential method

•Inductive methods

•Geomagnetics – vector measuring of the earth magnetic field

•Noncontact probing of protective currents in pipelines

Specifications

Climatic Performance	IP65
Temperature Range	-30 to +65°C
Receiver
Operation Frequencies	DC, 0.61, 1.22, 2.44, 4.88, 50, 100, 625, 1250, 2500 Hz
Input Voltage Range,
DC	10 mkV ± 4 V (at Rinp 10 mOhms)
	100 mkV ± 4 V (at Rinp 100 mOhms)
0.61, 1.22, 2.44, 4.88, 50, 100, 625, 1250, 2500 Hz	0.1 mkV – 2.8 V
Input Active Resistance	100 mOhms (DC)
	100 mOhms (AC)
Input Capacitance	15 pF (max) (AC)
Pass band (specified by operator)	(2-3)% / (4-6)% (4.88, 50, 100 Hz)
	0.1% / 0.2% (625, 1250, 2500 Hz)
Interference Suppression	100 dB (DC)
(50-60 Hz and radio frequencies)	100 dB (0.61, 1.22, 2.44, 4.88, 625, 1250, 2500 Hz)
Memory Capacity	5200 readings
Extraneous DC Voltage Compensation	Automatic
Interface	RS-232C
Basic Reduced Measurement Error	1% (Input Voltage, DC)
	4% (Ratio of input voltage to generator output current;
	for 0.61, 1.22, 2.44, 4.88, 625, 1250, 2500 Hz)
Supply Voltage	12 V, Built-in Accumulator Unit
Consumption Current	30 mA (max.)
Internal Power	Supply Accumulator Unit – 2000 mA AA (R6)
Weight; Overall Dimensions	1.2 kg;     160 x 52 x 200 mm
Connected Input Receivers	– Ground Receiver Electrodes
	– Active Electrodes
	– Air Electric Antenna
	– Trail Receiving Line
	– Magnetic Antenna – Ferroprobe
	– Induction Magnetic Antenna
Transmitter
Output Regulated Current	1, 2, 5, 10, 20, 100, 200 mA
Voltage	to 1000 V (DC)
Operation Frequencies	0, 1.22, 2.44, 4.88, 625, 1250, 2500 Hz
External Power Supply	12 – 24 V
Built-in Accumulator Unit	2 AH, Panasonic
Maximum Output Power	40 BA (max.)
Weight; Overal Dimensions	2.3 kg (Including Internal Accumulator) 160 x 160 x 60 mm
Output Current Form	Meander
Output Generators	Ground Electrodes; Closed Loop; Trail Lines (“625Hz)
Rotating Field Mode	Available (if two generators used)