Introduction
The magnetic shielding Lab Kit is highly effective in solving design problems of magnetic interference. (D.C. to 100 kilohertz). By adding CO-NETIC and NETIC layers until desired attenuation is achieved, minimum material requirements can be determined. This results in significant cost savings in the final design.
An important advantage of the "hands-on" shielding approach is that changes in a circuit layout, shield configuration, power levels and component orientation are easily evaluated. Each consideration is evaluated without reliance on theoretical formulas that are imprecise. The Lab Kit permits magnetic shields to be designed and modified until required performance is obtained. The prototype then serves as a model for production.
Lab Kit Contents
The Lab Kit provides a wide variety of CO-NETIC and NETIC alloys. The material included is Perfection Annealed and will not require re-annealing unless severe forming or heli-arc welding is performed.
1 - CO-NETIC AA Foil .002" x 4" x 15" / 0,051 x 101,6 x 381,0 mm
1 - CO-NETIC AA Foil .004" x 15" x 10" / 0,102 x 381,0 x 254,0 mm
1 - CO-NETIC AA Foil .010" x 15" x 10" / 0,254 x 381,0 x 254,0 mm
1 - CO-NETIC AA Alloy .025" x 15" x 10" / 0,635 x 381,0 x 254,0 mm
1 - CO-NETIC Braided Sleeving 1/2" I.D. x 1 FT. / 12,7 mm x 30,48 cm
2 - NETIC S3-6 Foil .004" x 15" x 10" / 0,102 x 381,0 x 254,0 mm
1 - NETIC S3-6 Alloy .030" x 15" x 10" / 0,762 x 381,0 x 254,0 mm
1 - roll Double-faced Pressure Sensitive Tape
1 - A.C. Magnetic Probe, Model EP-101A
1 - Product Information Binder
Magnetic Pickup Probe
The A.C. Magnetic Field Evaluator Probe furnished with the Lab Kit can be used with a DVM or oscilloscope. It will measure magnetic field intensities and the attenuation ratios of magnetic shields. The nominal probe output is 20 millivolts peak per Gauss at 60 Hertz. The probe is accurate for direct measurements from 10 Hertz to 3 kiloHertz. Above 3 kHz it should be used only for measuring relative intensities. Each probe is carefully calibrated with the calibration number shown on the probe label.
Magnetic Shield Design
THEORY
For D.C. and low frequency A.C. magnetic fields, a magnetic shield provides a low reluctance magnetic path for the interference field. The shield attracts flux lines to itself and diverts the magnetic field away from the sensitive component. This principle is basic in determining the design of a magnetic shield.
SHAPE OF SHIELD
The optimum shield is a closed, spherical configuration. In practice, effective shields can be cans, open-ended cylinders, five-sided boxes, U or L shaped brackets, and even flat plates. A flat plate is effective if both the length and width of the shield exceed the distance separating the source and receiver of interference.
Prototype Shield Construction
CONFIGURATION
For greater attenuation:
- » Provide a space up to 1/4" between the shield and the internal component.
» Enclosure of the component by the magnetic shield should be as complete as possible.
» Cylinder ends can be capped, or the cylinder length extended past the component by a distance equal to one diameter.
» Boxes should be five or six-sided until it can be experimentally determined that less enclosure is still effective.
LAYOUT
- » Cardboard templates should be used to check fit and layout before cutting the shielding material.
» Seams and joints should be held to a minimum.
» Overlap material 1/2" to 3/4" at each joint. Seams may be solder-tacked.
| ORDER: | |
| LK-120 COMPLETE | $149.50 |
| LK-110 (LESS PROBE) WITH EF-401 GAUSSMETER | $199.95 |
| LK-110 (LESS PROBE) | $99.50 |
| EP-101A PROBE ONLY | $50.00 |
Prices subject to change without notice.
Prices are U.S. dollars, FOB ex-factory only.
You may order Lab Shielding Kits by completing the online ordering forms below, or by calling our offices.
To order other Magnetic Shield products, we recommend contacting us by telephone.
Please mail or fax Confirming Purchase Orders, if used. Our fax number is 630-766-2813.
We do not sell or rent the information you provide us online to any third parties.
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Magnetic Shield Corporation
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1-888-766-7800 (U.S.)
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