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Portable Proton Magnetometer G-856A
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The model G-856 proton magnetometer measures the absolute value of the total geomagnetic field to a resolution of
0.1 gamma. Accurate, light, and versatile, the G-856 is well suited to a wide range of applications including geological mapping, mining, fault location, archaeology, and
magnetic search. The internal digital memory allows convenient storage and retrieval of field readings.
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Data can be retrieved either manually or by direct hookup to either a printer or a personal computer.The instrument is designed for easy use by even unskilled personnel. A built in Julian
clock monitor the exact time of each reading and special function buttons prevent the accidental
erasure of stored data .The unit incorporates a unique "Brazil Switch" that provides convenient adjustment for the weaker signal typically present near the magnetic equator. With the MAGPAC
IBM compatible software (included with system) a wide variety of processing algorithms can be applied to the data including averaging, filtering out regional gradients, elimination of temporal
variation (if base station data is available), and generation of contour maps. The system comes complete with sensor, staff, chest harness, MAGPAC software, two sets of batteries, and
operation/applications manuals.
Specifications
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Display:
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Six digit display of field to 0.1 gamma, or time to nearest second. Three digit display of station, day, line number,
battery voltage, or signal strength.
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Resolution :
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Typically 0.1 gamma under average conditions, may degrade in weak fields, high gradients, or noisy conditions.
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Accuracy:
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0.5 gamma
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Cycle time:
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normally 3 seconds, as a base station can be autocycled every 2 seconds.
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Data storage:
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5,700 readings in portable mode, 12,000 in base station mode. Power failure will not cause any data loss.
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Power:
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9 D cell industrial grade batteries or 12 volt external power (with optional external power cable)
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Weight:
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Instrument console - 6 lb., Staff & Sensor - 6 lb.
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GRADIOMETER ACCESSORY
The portable gradiometer option employs two sensors, samples and stores readings from each in quick succession, and uses the difference between the readings to more precisely locate
shallow objects. Gradient information is particularly useful for shallow search and survey applications because it can quickly define the depth and location of objects without the need for a
base station. The gradiometer accessory consists of a gradiometer adaptor switch, a second proton precession sensor, cables, special sensor staff, and MAGPAC IBM-compatible software
for automatic diurnal correction of total field data as well as filtering, contouring, and other data processing operations. The gradiometer has an accuracy of 0.1 gamma or 0.02 gamma per foot
for sensor spacing of greater than 5 feet. When used in the gradient configuration, the system is capable of storing up to 2850 pairs of readings. The instrument functions as a regular
magnetometer when the adaptor switch is not used.
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