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Shielding Effectiveness (SE) Testing

Rhein Tech Laboratories offers SE testing to many different standards. The most common SE standard is IEEE 299.

We can accommodate various frequencies with corresponding antenna setups to cover the entire frequency range(s) as required, and we can measure maximum attenuation levels up to 100 decibels.

We can test any sample size and shape up to 26” x 26” with a custom bulkhead adapter panel.

Our 12’ x 8’ x 8’ shielded room has a 28” x 28” bulkhead opening to achieve maximum radiofrequency illumination with a 24” x 24” exposed sample area using a 25” x 25” - 26” x 26” test sample.

The test sample size, the frequency requirements, and the necessary antennas ultimately determine the SE test setup. Figure 1 below depicts a general test configuration setup.

Figure 1: Shielding Effectiveness - General Test Configuration

To determine the SE of the test sample, or shield under test (SUT), three main measurements are required. These setups are illustrated in corresponding images #1-3 below.

1. Signal attenuation of the closed bulkhead (solid plate bolted to bulkhead) as a reference to determine the dynamic range of the test setup.

2. Signal attenuation of the open bulkhead (free space) as a reference measurement for the test setup.

3. Signal attenuation of the shield under test (SUT) bolted to the bulkhead.

Effectively, the SE of the SUT equals the differential between the reference measurement data in dB units and the test sample measurement data in dB units.

Next Steps

To ensure we can accommodate your SE testing requirements and prepare a proper quote for SE testing services, we need specifics about your SUT and test parameters per the following questions:

  1. SUT shape and sample dimensions (Note: this determines if a custom bulkhead adapter is required.)

  2. Describe the test sample material, including thickness and overall construction.

  3. Describe any unique aspects or special handling requirements.

  4. Expected test sample attenuation in decibels (dB). Note: this ensures we have a sufficient dynamic range for your testing needs.

  5. The frequency range for testing.

  6. Does testing require discrete frequencies of interest or a sweep of the frequency range?

  7. Are Vertical-Vertical polarity and/or different incident angles required? Note: typical SE testing generally provides data for Horizontal-Horizontal polarity using the transmit and receive antennas at a 90-degree incident angle, but we can accommodate other polarities.

  8. Do you require tabulated results or a full report?

  9. Desired timeframe for testing.

Image 1: Standard adapter plate clamped to the closed brass bulkhead for signal attenuation measurement as a reference to determine the dynamic range of the test setup

Image 2: Open bulkhead ready for reference signal measurement using Horizontal-to-Horizontal antenna polarization

Image 3: SE SUT ready for signal attenuation measurement, secured within the 24” x 24” opening of the aluminum frame adapter secured to the brass bulkhead with mounted toggle clamps

Image 4: Example of a custom adapter plate with a small-square opening for smaller sample sizes, clamped to brass bulkhead opening

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