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EM16 | EM16R | TX27

The EM16 VLF Receiver is the most widely used electromagnetic geophysical instrument of all time. Local tilt and ellipticity of VLF broadcasts are measured and resolved into inphase and quadrature components of VLF response. The EM16 has discovered several base and precious-metal ore bodies and many water-bearing fractures and faults.

The EM16R Resistivity Attachment uses a pair of electrodes to measure the apparent resistivity of the earth. The combined EM16/16R instrument can detect a second earth layer if the layer occurs within the VLF skin-depth. In addition, the EM16/16R can map resistive alteration for gold exploration.

The TX27 is a portable VLF transmitter supplying a VLF field for surveying with either the EM16 or EM16/16R if remote broadcasts are weak, intermittent or poorly coupled with the target. For EM16 surveys, the TX27 antenna consists of a long (typically 1 km) grounded wire.

Specifications
MEASURED QUANTITIES
  EM16: inphase and quadrature components of the secondary VLF field, as percentages of the primary field
  EM16R: apparent resistivity in ohm-metres, and phase angle between Ex and Hy
PRIMARY FIELD SOURCE
EM16: ferrite-core coil
EM16R: Stainless-steel electrodes, separated by 10 m: impedence of sensor is 100 MΩ in parallel with 0.5 pf
SENSOR
9.8 kHz
OPERATING FREQUENCY
15 to 25 kHz (optionally to 30kHz) depending on VLF broadcasting station
MEASURING RANGES
EM16: inphase: ±150%
         quadrature: ±40%
EM16R: 300,3K,30KΩ-m
            phase: 0 - 90°
POWER SUPPLY
EM16/EM16R: 6 alkaline “AA” cells
DIMENSIONS
EM16/EM16R: 53x30x22 cm
WEIGHTS
EM16:1.8 kg;shipping:6.2 kg
EM16R:1.5 kg;shipping:6 kg

 
             
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