The FGS-03e is a low noise 3-axis fluxgate sensor. It extends the frequency range for MT measurements down to DC. The sensor core unit is a Bartington Mag-03
For lower frequencies all transfer functions are linear. This sensor is designed for crustal studies where periods of 10,000 seconds and more are needed. Recording time for those periods are three to eight weeks depending on the data quality (magnetic activity and external interferences by man made noise).
The fluxgate is measuring the total magnetic field (B). A induction coil is measuring dB/dt.
A good coincidence can be seen for periods greater than 30s. For higher frequencies (smaller periods) a fluxgate can not be used for MT.
DC ..... 3 kHz
DC – 30 sec for MT measurements
< 0.006 nT √Hz @ 1Hz
0.1 mV/nT (model L100)
0.143 mV/nT (model L70)
|Output voltage range
± 100,000 nT (model L100), ± 70,000 nT (model L70)
ODU G32KON-T08QJ00-000 (FluxGate socket)
ODU S22KON-T08MJG0-7000 (cable plug)
|Offset temperature coefficient
± 0.1 nT / °C
± 5 nT
± 12V to ± 15V stabilized and filtered
+26mA, -6mA (+1.4mA per 100μT for each axis)
ruggedized, waterproof case
approx. 3 kg
length 300 mm, Ø 75mm
|Operating temperature range
-40°C ..... + 70°C