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Electromagnetic Interference Measurement Antennas; Calibration Method
- Aerospace Standard
- ARP958E
- Revised
Downloadable datasets available
Annotation ability available
Sector:
Issuing Committee:
Language:
English
Scope
This SAE Aerospace Recommended Practice outlines a standardized and economical method for the checkout and calibration of electromagnetic interference measurement antennas. Its application is for use when measuring a source 1 m from the antenna in a shield room. This is the typical distance used in performing military EMC testing. The influence of the shield room on the measured field strength is not considered. This standard does not address the measurement of emissions from an unknown distributed source, yet it attempts to resemble reality by using another antenna, in the calibration method, that represents a distributed source. This document presents a technique to determine antenna factors for antennas used primarily in performing measurements in accordance with References 2.1 and 2.2. The purpose of Revision B was to include the calibration of other antennas, such as biconical, horn, monopole and small loop antennas that are also specified for use in these same references. Revision D includes a specific procedure for loop antennas that are separated by 1 m from the device under test. Revision E adds the inclusion of modern instrumentation, instruction on how to calibrate the hybrid antenna, and attempts to improve upon the clarity of this document for the user.
Rationale
This document was fully revised to bring the content and formatting up-to-date. The following major improvements were also incorporated as part of this revision:
-
1
Defined how to calibrate hybrid biconical log antennas. Documented the measurement distance position on each antenna.
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2
Incorporated the three-antenna method and compared with the two “identical” antenna method, particularly where the antenna is of the same type (e.g., biconical) but not the same manufacturer or model. At least two 1:1 (50 Ω) baluns should be paired, and two 4:1 (200 Ω) baluns.
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3
Corrected errors in the ECSM equations.
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4
Clarified the content in Appendix C and standardized globally.
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5
Added near-field formulation to derive Antenna Factor (AF) from the site insertion loss between a pair of antennas as it relates to measurement uncertainty.
Recommended Content
Topic
Data Sets - Support Documents
Title | Description | Download |
---|---|---|
Unnamed Dataset 1 | ||
Table 1 | Antenna factor for RE01/RE101 loop | |
Table 2 | Antenna factor for 4 cm calibrating loop | |
Unnamed Dataset 4 | ||
Unnamed Dataset 5 | ||
Unnamed Dataset 6 | ||
Table 3 | Inputs | |
Table 4 | Calculations | |
Table B1 | ||
Table B2 | ||
Table C1 |
Issuing Committee
AE-4 Electromagnetic Compatibility (EMC) Committee
It is the duty of the AE-4 Electromagnetic Compatibility (EMC) Committee to produce advisory materials for the aerospace community in the following areas: Electromagnetic Compatibility (EMC), Electromagnetic Interference (EMI), and High Intensity Radiated Field (HIRF) environments
Reference
Number | Title |
---|---|
ANSI/C 63.5 | This document is not part of the subscrption. |
IEEE STD 149 | This document is not part of the subscrption. |
IEEE STD 291 | This document is not part of the subscrption. |
J551/5_201711 | Performance Levels and Methods of Measurement of Magnetic and Electric Field Strength from Electric Vehicles, 150 kHz to 30 MHz |
MIL-STD-461 | This document is not part of the subscrption. |
MIL-STD-462 | This document is not part of the subscrption. |
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