TWIN MR-3 is an upgraded version of the MR-3 active degaussing system. Designed for high-end electron microscopy applications in life and materials science, TWIN MR-3 eliminates environmental field noise even in challenging magnetic field environments. TWIN MR-3 uses two low-noise triaxial fluxgate sensors to measure the magnetic field. The signals from the two sensors are combined through an adjustable mixer to create a "virtual sensor" within the electron microscope column. The dual-sensor configuration significantly improves performance in non-uniform magnetic fields, such as those caused by nearby field sources. Furthermore, as with the single-sensor MR-3, the distance between the sensor and the EM column can be greater, reducing sensitivity to magnetic field changes generated by the microscope itself, for example during image mode changes.

Technical Specifications:

Magnetic Field Sensors	2 triaxial fluxgate sensors
Zero Drift	<0.1 nT/K
Noise	<0.2 nT RMS (0.1 to 1000 Hz)
Analog Output	1 V/ μT, BNC connectors for X,Y, Z
Bandwidth	0 to 1000 Hz(-3 dB)
Digital Display	Displays incremental DC or true RMS AC magnetic fields for X, Y, and Z
Analog Meter	Displays DC coil current, range ±3 A
Near DC Field Cancellation Factor	typ.500 (Dc incremental to 10 Hz)
AC Magnetic Field Cancellation Factor	typ. 100 at 50 Hz
AC Magnetic Field Cancellation Factor	typ. 10 at 250 Hz
I/O Ports	Displays DC coil current, range 3A