ETS-Lindgren 6404 User Manual
Model 6400 Series
Helmholtz Coil
User Manual
ETS-Lindgren L.P. reserves the right to make changes to any product described
herein in order to improve function, design, or for any other reason. Nothing
contained herein shall constitute ETS-Lindgren L.P. assuming any liability
whatsoever arising out of the application or use of any product or circuit
described herein. ETS-Lindgren L.P. does not convey any license under its
patent rights or the rights of others.
© Copyright 2001–2011 by ETS-Lindgren L.P. All Rights Reserved. No part
of this document may be copied by any means without written permission
from ETS-Lindgren L.P.
Trademarks used in this document: The ETS-Lindgren logo is a trademark of
ETS-Lindgren L.P.
Revision Record | 6400 Series Helmholtz, MANUAL | Part #399273, Rev. B
Revision Description Date
A Initial Release December, 2001
B Updated title to reflect series.
Revise to current style standards.
Removed filter addendum, add
filter information as a numbered
section
C Update table format in Section 3,
Specifications.
Update measurement in Section 5,
Operation from 2.45 cm to 2.54 cm
ii |
June, 2009
April, 2011
Table of Contents
Notes, Cautions, and Warnings ............................................... iv
1.0 Introduction .......................................................................... 5
Model 6406S or Split Base Helmholtz Coils .................................................. 6
ETS-Lindgren Product Information Bulletin ................................................... 6
2.0 Maintenance ......................................................................... 7
Maintenance Recommendations ................................................................... 7
Annual Calibration ......................................................................................... 7
Service Procedures ....................................................................................... 7
3.0 Specifications ....................................................................... 9
4.0 Theory of Operation ........................................................... 13
5.0 Operation ............................................................................ 17
Helmholtz Coil Placement ............................................................................ 17
Helmholtz Coil EUT Table ........................................................................... 17
Adding Power to the Helmholtz Coil ............................................................ 18
Appendix A: Warranty ............................................................. 21
Appendix B: Conversion Table for Magnetic Units .............. 23
| iii
Notes, Cautions, and Warnings
Note: Denotes helpful information intended to
See the ETS-Lindgren Product Information Bulletin for safety,
regulatory, and other product marking information.
provide tips for better use of the product.
Caution: Denotes a hazard. Failure to follow
instructions could result in minor personal injury
and/or property damage. Included text gives proper
procedures.
Warning: Denotes a hazard. Failure to follow
instructions could result in SEVERE personal injury
and/or property damage. Included text gives proper
procedures.
iv |
1.0 Introduction
ETS-Lindgren Model 6400 Helmholtz Coils create an extremely uniform low
frequency magnetic field between and in the center of the coils. The generated
field can be applied as a magnetic field immunity test system or a low frequency
calibrator. The strength of the magnetic field generated is directly proportional to
the number of turns in the coils and the current applied to them. The coils are
wound in series so that the magnetic field produced by current flowing in one coil
aids the field in the other coil. The windings on all standard Helmholtz coils are
wound of insulated magnet wires. The wire gauge varies depending upon the
model of the coil system and details are found in the Specification section of this
manual. The maximum current of a custom Helmholtz coil is determined by the
wire gauge.
Several of the Helmholtz coils are equipped with a rotatable, adjustable-height
pedestal capable of supporting equipment under test (EUT) in the center of the
assembly base. Equipment which is exposed to the homogenous magnetic field
should be placed on the equipment test table with the height adjusted so that the
center of the equipment is closely aligned with the axis of the coils.
Ferromagnetic objects within the cylindrical volume of the coil tend to distort the
magnetic fields in areas near the object. The coil system has been constructed
with minimal metallic components limited to the copper conductors, the electrical
connectors and the caster frames. The casters, however, are outside of the coil
cylinder and cause practically no field disturbance.
Precision in the manufacture of the coils and their support assembly are well
within a design tolerance of 0.5 cm (0.2 in) in both radius and axial separation.
The limit of this tolerance would produce a maximum error of 0.55% in the
accuracy of the magnetic field constant under the worst conditions. For this
reason the Helmholtz coil is considered a standard and produces a magnetic
field whose accuracy is governed by the accuracy of the current monitoring
equipment.
Introduction | 5
Model 6406S or Split Base Helmholtz Coils
A standard ETS-Lindgren Helmholtz coil consists of two identical circular coils
placed in parallel and spaced one radius apart. The coils are both mounted to a
single base with an adjustable pedestal placed in the center to position the EUT.
Some EUT’s, however, do not fit conveniently on the pedestal. In these instances
a split base option may be ordered. Each coil is mounted on a separate wheeled
base for positioning on either side of the EUT, such as an automobile.
The Model 6406S Helmholtz Coil consists of two coils secured on separate base
mounts in the Helmholtz configuration which can be used as a low frequency
calibrator. The coil provides a magnetic field which is essentially homogenous
throughout the volume of a 0.60 meter (2 foot) cylinder in its center. The coil
forms are rigidly supported by a nonmetallic, nonmagnetic framework. The
supplied cable assembly and proper orientation of the coils insures that the
Helmholtz coil system is arranged in the series-aiding configuration.
ETS-Lindgren Product Information Bulletin
See the ETS-Lindgren Product Information Bulletin included with your shipment
for the following:
• Warranty information
• Safety, regulatory, and other product marking information
• Steps to receive your shipment
• Steps to return a component for service
• ETS-Lindgren calibration service
• ETS-Lindgren contact information
6 | Introduction
2.0 Maintenance
Before performing any maintenance, follow
the safety information in the ETS-Lindgren
Product Information Bulletin included with
your shipment.
Maintenance of the Helmholtz coil is limited
to external components such as cables or
connectors.
WARRAN TY
Clean the exterior of the coil using a damp
cloth and mild cleaner. Always unplug the
unit before cleaning.
If you have any questions concerning
maintenance, contact ETS-Lindgren
Customer Service.
Maintenance Recommendations
Maintenance is limited to periodically cleaning the coil with a clean, damp cloth.
Annual Calibration
See the Product Information Bulletin included with your shipment for information
on ETS-Lindgren calibration services.
Service Procedures
For the steps to return a system or system component to ETS-Lindgren for
service, see the Product Information Bulletin included with your shipment.
Maintenance | 7
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8 | Maintenance
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