Schwarzbeck HHS 5206-132 Circular Helmholtz Coils

Manufacturer:
Schwarzbeck
Online Orders Ship Same Day

 

SKU:
sku-1493

 

This product is available for shipping to North America and Western European countries.


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Overview

Helmholtz-Coils are especially designed to generate precisely defined magnetic fields from DC to the upper end of the audio frequency range and beyond. The generated fields are in a strongly linear relation to the coil current. The fieldstrength can be calculated exactly by analytical (or numerical) methods, based on the coils' geometry, the number of turns and the coil current.

Therefore the HHS 5206-132 is ideally suited for the calibration of magnetic field probes or sensors. Typical applications are magnetic immunity testing according to automotive standards or MIL-461F. When generating magnetic fields with Helmholtz coils the coil current is directly proportional to the magnetic field strength. The calibration of the magnetic field is finally traceable to a current measurement (or to a voltage drop at a known resistor).

The Helmholtz Coil itself is usually considered as 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.

Installation

The Helmholtz-Coils should be installed on a desk 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 so on. All kinds 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 Helmholtz-Coil should be twisted to avoid an unwanted injection of magnetic flux.

The coil terminals are assigned with the characters A, B, C and D. The generator (current source, audio-amplifier...) is connected to the terminals A and C, the terminals B and D are connected with the short cable supplied with the coil.

An additional verification can be done by measuring the magnetic fieldstrength between the coils. Assuming a wrong connection, the fieldstrength decays very sharply in the center between the coils, because the fields compensate each other.



Typical Test Setup for Immunity against magnetic fields

Specifications
Number of turns (per Coil) 132
Maximum Coil Current 15 A, 5 min
Nominal Coil Current 10 A continuous
Coil Spacings 300 mm
Maximum magnetic field strength 4713 A/m, 5 min.
Nominal magnetic field strength 3142 A/m continuous
Magnetic field strength @ 1 A Coil Current 314.2 A/m
169.97 dBµA/m
Current required for 1 A/m 3.183 mA
Conversion Current Fieldstrength (Coil factor) 50 dB/m
Coil diameter 600 mm
Mechanical dimensions 0.64 m x 0.79 m x 0.42m
Max. cubical shaped DuT 32.5x32.5x32.5 cm
Terminals 4 mm banana jacks
Screw terminals
Usable frequency range DC - 30 kHz
Inductance (per coil) 22.4 mH
Inductance (pair of coils) 49.9 mH
Resistance by 20°C (per coil) 1.42 ?
Resistance by 120°C (per coil) 1.96 ?
Coil capacitance (pair of coils) 174 pF
Resonance frequency (Pair of coils) > 50 kHz
Weight 27.5 kg

Key Considerations

Manufacturer:
Schwarzbeck

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