The Helmholtz-Coil HHS 5230-100 are especially designed to generate precisely defined magnetic fields from DC to ca. 5 kHz, e.g. according to SAE J551-17. Typical applications are magnetic immunity testing to whole vehicles according to SAE J551-17 (Vehicle Electromagnetic Immunity – Power Line Magnetic Fields).

The Helmholtz Coil itself is usually considered as a primary standard due to the easily calculable relation between current and field strength. If this relation should be controlled, a loop sensor or monitoring loop can be used to determine the actual field strength.

The setup of the coils is described in the following part of the manual: “Assembly Instructions for Helmholtz Coil Pair HHS 5230” The Helmholtz-Coils should be installed on the floor in a sufficiently large separation from sources of unintentional magnetic fields, e.g. transformers in power supplies, conductors carrying high currents, computer monitors, loudspeakers, cathode ray tubes (CRT) and more.... All kind of magnetic material (e.g. steel, Nickel, Cobalt) should be removed from the near surrounding of the coil. The wires which are used to connect the current source with the HelmholtzCoil should be twisted to avoid an unwanted injection of magnetic flux. The coil terminals are assigned with the characters A, B, C, and D. During the operation of the coils, the terminals must show in one direction. Otherwise, there will be a deletion of the magnetic field in the middle between the coils. 

Specifications:     

  Recommended Accessories:

NFCN 9731-100 - Compensation Network

The primary function of the compensation network NFCN 9731-100 is to provide a serial compensation of the inductance of i.e. the HHS 5230-100 at operation frequencies of 16.666 Hz, 50 Hz, 60 Hz, 150 Hz und 180 Hz. These operation frequencies are stipulated by SAE J551 - 17 (Vehicle Electromagnetic Immunity – Power Line Magnetic Fields).

The compensation capacitor reduces th e overall impedance of the series circuit consisting of the Helmholtz coil HHS 5230-100 and the compensation network NFCN 9731-100 at the applied operating frequency and allows currents up to 8 A_rms at a generator voltage of less than 60 V_rms.