FESP 5133-9 - Circular Screened Coil


FESP 5133-9 - Circular screened Coil

  • FESP 5133-9 - Radiating Loop_


The magnetic, handheld coil FESP 5133 was designed to generate defined magnetic field strength in the audio frequency range up to 3 MHz. The main application is immunity testing against magnetic fields according to  VG 95377 Part 13 and many others. Depending on the current source characteristics magnetic fields up to 400 A/m can be generated for a short time.

There are further rings available on request in order to provide a certain scaling between coil current and magnetic field strength (e.g. 1 Amp coil current = 10 A/m field strength).


Application as magnetic field probe:

The FESP 5133-9 can also be used to measure existing magnetic fields. The open circuit output voltage is directly proportional to the magnetic field strength (at fixed frequency) or directly proportional to frequency (at constant magnetic field strength).


Number of turns: 9
Wire diameter: 1.2 mm Cu
Maximum coil current: 11 A (5 min.)
Nominal coil current: 7 A continuous
Max. magn. field strength: 380.4 A/m (5 min.)
Nominal magn. field strength: 242 A/m continuous
Magnetic field strength, 1 A coilcurrent: (with 50 mm distance ring):

34.58 A/m

Current required for 1 A/m:
(with 50 mm distance ring)

28.9 mA
Flux density with 50 mA at 50 mm distance:

127 dBpT

Inner coil diameter:

133 mm
Medium coil diameter: 134.2 mm
Spacing coil center to measurement plane: 50 mm
Mechanical dimensions:  0.16 m x 0.2 m
Connector: N-jack
Usable frequency range: 10 kHz - 3 MHz
Inductance: ~ 20 μH


0.1 Ω


0.8 kg


VG 95377 Part 13


Datasheet FESP 5133-9