18 GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
Figure 3: Standard magnetometer components include a sensor, console, radio frequency
cable, download cable, shoulder harness, sensor mounting rod, and RS-232 cable. Also
included here are a GPS and GPS support rod. For a complete list of parts, consult your
packing slip. It may show, for example, that you have an additional sensor and radio
frequency cable (i.e. for a gradiometer configuration).
The following list summarizes the STANDARD parts that are shipped with a GSM-19 system:
• 1 sensor for magnetometer and 2 for gradiometer. Sensors are dual-coils designed to reduce
noise and improve gradient tolerance. Coils are electrostatically shielded and contain a special
proton rich liquid in a sealed Pyrex bottle Radio Frequency (RF) resonator. The liquid does not
need to be refilled.
• 1 coaxial sensor cable per channel, typically RG-58/U and 206 cm long. (Up to 100m long cable
is available optionally. Over 20m, we recommend a triaxial cable - Belden 9222).
• Fast reading magnetometers have two sensor cables – one for RF polarization and a microphone
cable for the signal.
• Console with all electronic circuits. It has 16 key keyboard, graphic display (64 x 240 pixel, or
8 x 30 characters), sensor and power / input / output connectors. The keyboard also serves as an
ON-OFF switch.
• 6-pin console connector for RS-232, external power, battery charging or external trigger.
Optional dual analog output is available on a 3-pin connector.
• Sealed connectors (i.e. keyboard and front panel mounting screws are sealed so that the
instrument can operate under rainy conditions).
• Charger with 2 levels of charging (full and trickle) that switch automatically from one to
another. Input is 110 - 250V, 50 / 60 Hz.
• All-metal console housing for excellent electromagnetic interference (EMI) protection.
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