Evaluation of the EUROSHIELD 4F-130 RF Leak Detectors
Abstract
EUROSHIELD OY of Finland offers a 4F-130 RF Leak Detector for the determination of the electromagnetic shielding effectiveness (SE) of enclosures. The measurement protocol employed for this purpose is the magnetic loop test of MIL-STD-285. This report gives the results of a study of the performance of these instruments. Four leak detectors (transmitter/receivers pairs) were evaluated. The first phase of the study consisted of the design, construction and installation of a sample and hold digital readout in the place of the original analog display. Next, linearity and absolute value of SE measurement were compared to those obtained using a calibrated EMI receiver. This was done directly or indirectly for each of the four detector sets. Generally the leak detectors performed quite well in these tests. Repeatibility of measurement values was examined with time, operator, geometry and environment as variables. Agreement among the SE's determined in different conditions was good when the test conditions were rigidly controlled. When the more usual methods of MIL-STD- 285 with different operators were used, the resulting SE's had a noticeable larger speed. A small investigation was made of the effect of test point location and how nearby conducting planes can influence the SE's obtained. The effect of images of the sources tends to decrease SE values when the loop axes are perpendicular to such planes.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 14, 1991
- Accession Number
- ADA251606
Entities
People
- James R. Elliott