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Magnetic compensation flight procedures are required after each new installation of the magnetic sensors.

Magnetic measurements provide the direction of the geomagnetic field. Therefore, 2 Cesium Magnetometers are mounted in a Nose and a Tail Boom to the aircraft. In addition, a Fluxgate Magnetometer for attitude compensation is installed. The sensor system is controlled by an external unit (AADC II) mounted in a rack. Magnetic base stations with Overhauser magnetometers are used for ground reference of the airborne measurements.

Sensor-Info: aircraft:bt-67:magnetics, 6815

|| Dimension Compensator (L x W x H)| 483 x 440 x 178 mm ||
|| Weight | 12.5 kg||
|| Power Supply| 28 VDC ||
|| Data interface | serial interface (RS-232)||

|| Dimension Sensor Head (Diameter x L)| 63 x 160 mm ||
|| Weight | 1.15 kg||
|| Dimension Sensor Electronics (Diameter x L | 63 x 350 mm ||
|| Weight | 1.5 kg || 
|| Power Supply| 24 - 35 VDC ||

|| Dimension Fluxgate (L x W x H) | 83 x 35 x 32 mm ||
|| Weight | 0.1 kg ||
|| Power Supply | 15 - 34 VDC ||
|| Data interface | serial interface (RS-232)||

|| Dimension Sensor (Diameter x L) | 75 x 175 mm ||
|| Weight Sensor | 1.0 kg ||
|| Dimension Console (L x W x H) | 223 x 240 x 69 mm ||
|| Weight Sensor | 2.1 kg ||
|| Data interface | serial interface (RS-232)||

During flight magnetometer data are stored within the aircraft onboard DMS system. Magnetic base stations record data independantly and continously.

After the flight CS-3 and Fluxgate magnetometer data are accessible via the land system of the aircraft data managment system (DMS). Base station data of the GEM Overhauser magnetometers are downloaded frequently and are made accessible via the external devices file system of the aircraft data managment system (DMS).

|| Module name| B707 Magnetic||
|| Device name | Magnetic||
|| Parameters | 4DIF(F) front \[nT\]; 4DIF(R) rear \[nT\]; Compensated grad 1 \[nT\]; Compensated mag front \[nT\]; Compensated mag rear \[nT\]; Error code; ErrorText; Magnetic ASCII; Mode code; Scan Number \[0.1 s\]; Status; Total field (Fluxgate) \[nT\]; Uncompensated grad 1 \[nT\]; Uncompensated mag front \[nT\]; Uncompensated mag rear \[nT\]; X-component (Fluxgate) \[nT\]; Y-component (Fluxgate) \[nT\]; Z-component (Fluxgate) \[nT\] ||

• Billingsley Fluxgate Datasheet (Factsheet, 50 kB)
    
• Overhauser Magnetometers For Measurement of the Earths Magnetic Field (Factsheet, 5 MB)
    
• AADCII User Manual (User Manual, 4 MB)
    
• RMS Instruments Web site (Web site)
    
• Scintrex Ltd. Web site (Web site)
    
• Billingsley Web site (Web site)
    
• GEM GSM-19 Brochure (Factsheet, 447 kB)
    
• GEM Systems Web site (Web site)