Geometrics G-822A

The G-822A is designed for all airborne or mobile applications where the unique combination of high sensitivity and very rapid sampling of the earths magnetic field are required. Applications include mapping geologic structure for mining, oils and gas exploration and the detection and delineation of target bodies in environmental and engineering surveys. The G-823A variant includes a CM221 counter assembly which digitises the larmor and outputs a serial data string.

Features include:

Automatic hemisphere switching
Highly Versatile, larmor output, or RS232 in the G-823A variant
High Sensitivity 0.0005nT/root Hz RMS with the G-822A super-counter
Digital output, (G-823A only) can be logged with MagLog™ software.
High bandwidth, can track changes of 1000's nT over periods as small as 0.1 sec

Specifications

Measured Quantity	Total Magnetic field in nT typical sensitivity 0.0005nT/root HZ RMS with super counter, <0.004nT/root Hz RMS in G-823A
Operating Principle	Self Oscillating split beam Optically pumped Caesium Vapor cell (non-radioactive)
Heading Error	< ± 0.25nT over entire 360° range
Absolute Accuracy	<3nT throughout range
Output	Cycle of larmor frequency, 3.498572 Hz/nT 2V P-P. RS232 serial output in G-823A Variant
Power Supply	24 to 32 VDC
Operating Temperature	-35° to + 50° C
Operating Range	20,000nT to 100,000nT
Water tight	Sealed for occasional immersion to 60cm water depth
Operating Zones	The earth's field vector should be at an angle of greater than 6° away from the sensor's equator and greater than 6° away from the sensor's long axis. Automatic hemisphere switching
Physical:
Dimensions	Sensor 6.032cm dia x 15.875 cm long, Electronics: 6.35 cm dia 27.94 cm long
Weight	Sensor: 340g, Electronics: 623g

For actual test results of Caesium Vapour sensors heading error click here, for actual test results on Caesium Vapour sensors noise level and bandwidth click here.

Downloads:

G-822A datasheet G-823A datasheet

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