Narda Safety Solutions Field Analyzer EFA200:



Measuring instrument for assessing the safety of human exposure to radiation in magnetic fields and for acceptance testing of electrically operated equipment according to the CE standard IEC/EN 62233 (formerly EN 50366), Generic Standard IEC 62311 as well as ICNIRP 1998 and ICNIRP 2010. Direct evaluation of field exposure in comparison with major standards and regulations such as EMF Directive 2013/35/EU for workplaces.

  • Magnetic field measurement
  • Sensor integrated coil system (B-Field), tri-axial or single axis
  • Broadband frequency range, 5 Hz to 2 kHz, 30 Hz to 2 kHz, 5 Hz to 32 kHz or 30 Hz to 32 kHz
  • Measurement range with external probe, 4 nT to 32 mT

Example: Measurements in office space:

Magnetic fields measurements with NARDA EFA-200 in an office space. For better visualization, the measured
values were put into the software and displayed as isolines.


Isotropic magnetic field probe 100cm²:


SondeIsotropic probe, 100 cm2
The isotropic magnetic field probe with 100 cm² coil surface can be plugged into the NARDA EFA-200. It provides a higher level of sensitivity than with the internal probe. The probe is used for standard compliant measurements.



Spectramag-6, Bartington

This portable 6-channel 24-bit data acquisition unit is used for the simultaneous three-dimensional registration and analysis of the magnetic field, vibrations and acoustic data. In combination with a PC, the device can record data with rates of up to 10 kHz.

  • Sensitivity: 10 pT
  • DC and AC field measurements
  • Sampling interval 100µs to 10s
Typical applications:
  • Site survey for ebeam applications
  • Measurement of the attenuation of magnetic shielding measures
  • analysis of interfering frequencies

Example: Measurements in microscopy room:

Measurements of the magnetic flux density in an electron microscopy room. The measurements revealed, that the fields were higher than the interference limit of the microscope.

For comparison, the measurements were performed with magnetic field compensation off (lower charts, Input 2) and on (top charts, Input 1). The lower diagram on the right shows domination of the 50 Hz frequency with its  3rd, 5th, 7th and 9th harmonics. The top diagram, displaying measurements with compensation on, proves that the compensation is reducing the magnetic flux well below critical values.

Messung Spectramag 200
Microscope at ETH Zurich Measurement of magnetic flux density