Shielding effectiveness test following the Standard MIL-STD-285:The Standard MIL-STD-285 (actually replaced by IEEE-299) describes uniform procedures for measuring SE for enclosures at frequencies from 9 kHz to 18 GHz (extendable down to 50 Hz and up to 100 GHz), although the smallest linear dimension of the enclosure is assumed to be at least 2 m; the selection of 2 m as the smallest linear dimension was originally based upon being able to ﬁt a typical bicone-style antenna inside an enclosure to perform plane-wave testing down to the range from 30 to 50 MHz.
MIL-STD-285 - MEASURING THE ELECTROMAGNETIC SHIELDING ATTENUATION
The standard does not give any limits for pass/fail, leaving to the owner of the shielding enclosure to provide these limits.
In addition, although the standard suggests a range of test frequencies that can provide conﬁdence in the effectiveness of the shield, it is clearly stated that the actual test frequencies must be chosen according to a test planapproved by the shield owner, the tester, and the shielding provider/vendor.
The measurement range in this method is divided into three subranges and in each subregion, some subgroups of testing frequencies are suggested:
Emctest Technologies is a laboratory that performs shielding effectiveness tests on site
- A low-frequency range, from 9 kHz (50 Hz) to 20 MHz (a single frequency is suggested within 9–16 kHz, 140–160 kHz, and 14–16 MHz) where the SE is deﬁned in terms of magnetic-ﬁeld performance.
- A resonant range, from 20 to 300 MHz, where the SE is expressed in terms of either electric ﬁeld or power.
- A high-frequency range from 300 MHz to 18 GHz (100 GHz) (a single frequency is suggested within 300–600 MHz, 600–1000 MHz, 1–2 GHz, 2–4 GHz, 4–8 GHz, and 8–18 GHz) where the shielding performance of the enclosure is expressed in power terms.
, directly to the customer, in Italy and in Europe
, or at its headquarters in Rimini - Italy.
We perform shielding effectiveness tests for several sectors:
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Measurements are made according to customer specifications or in accordance with the main standards currently in use or: