138 GSM19 Series Magnetometers - Version 7
GEM Systems, Inc. Advanced Magnetometers
For more technical information, visit www.gemsys.ca
APPENDIX H: GSM-19 MAG / GRAD SPECIFICATIONS
Resolution: 0.01nT (gamma), magnetic field and gradient.
Accuracy: +/- 0.1nT over operating range.
Range: 15,000 to 120,000nT.
Gradient Tolerance: Over 10, 000nT/m
Operating Interval: 3 seconds minimum, faster optional. Readings initiated from keyboard,
external trigger, or carriage return via RS-232C.
Input / Output: 6 pin weatherproof connector, RS-232C, and (optional) analog output.
Power Requirements: 12V, 200mA peak (during polarization), 30mA standby. 300mA peak in
gradiometer mode.
Power Source: Internal 12V, 2.6Ah sealed lead-acid battery standard, others optional.
An External 12V power source can also be used.
Battery Charger: Input: 110 VAC, 60Hz. Optional 110 / 220 VAC, 50 / 60Hz.
Output: dual level charging.
Operating Ranges: Temperature: - 40
o
C to +50
o
C.
Battery Voltage: 10.0V minimum to 15V maximum.
Humidity: up to 90% relative, non condensing.
Storage Temperature: -50
o
C to +50
o
C.
Display: LCD: 240 X 64 pixels, OR 8 X 30 characters. Built in heater for operation
below -20
o
C.
Dimensions: Console: 223 x 69 x 240mm.
Sensor Staff: 4 x 450mm sections.
Sensor: 170 x 71mm dia.
Weight: console 2.1kg, Staff 0.9kg, Sensors 1.1kg each.
VLF
Frequency Range: 15 - 30.0 kHz
Parameters Measured: Vertical in-phase and out-of-phase components as percentage of total field.
2 relative components of horizontal field. Absolute amplitude of total field.
Resolution: 0.1%.
Number of Stations: Up to 3 at a time.
Storage: Automatic with: time, coordinates, magnetic field / gradient, slope, EM field,
frequency, in- and out-of-phase vertical, and both horizontal components for
each selected station.
Terrain Slope Range: 0
o
- 90
o
(entered manually).
Sensor Dimensions: 140 x 150 x 90 mm. (5.5 x 6 x 3 inches).
Sensor Weight: 1.0 kg (2.2 lb.).
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