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The M380 is a self-excited beam-splitting cesium vapor optical pump magnetometer system, which is used to measure the total geomagnetic field. It can be externally connected with fluxgate probe, GPS module, laser altimeter, etc. to form an aeromagnetic system. M380 basic module consists of cesium optical pump probe and data collector. The data collector has built-in larmor frequency counter and three-axis attitude meter, which can output the larmor frequency model and record of digital signal and sine wave at the same time

M380 has the following advantages: 

• L high sensitivity, high gradient tolerance
• L larmor frequency is continuously output, and it has the ability of quick response to external magnetic field.
• L built-in counter, which can output digital signals
• L built-in SD card for real-time data storage L Built-in Bluetooth module makes it easy to view data and settings on the mobile phone. 
• L expanded with multi-channel AD analog input and RS-232 serial port, it is convenient to connect various peripherals and expand into magnetometer system. 

Cesium optically pumped magnetometer uses Zeeman energy level splitting phenomenon of cesium -133 atom (non-radioactive) under external magnetic field to measure magnetism. When the optical pump probe is at an appropriate angle with the external magnetic field, cesium atoms will precess continuously around the direction of the external magnetic field, and the frequency of spin precession has a certain proportional relationship with the external magnetic field, and this precession frequency is called larmor frequency. This frequency is amplified and output by electronic circuit, and the value of external magnetic field can be obtained by measuring this frequency. M380 has a wide working angle and can automatically adapt to the change of magnetic field in the northern and southern hemispheres.