NSA-94-106 - MEASURING THE EFFECTIVENESS OF ELECTROMAGNETIC SHIELDING ENCLOSURES
The NSA 94-106 (ex NSA 65-6) is known as the parallel setup, where both transmitting and receiving antennas are in parallel planes, and parallel with the plane of the sample under test.
To perform the following test we need the equipment:
- Continuous wave (CW) source, 1 KHz to 10 GHz.
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Transmitting and receiving magnetic field antenna set covering 1 KHz to 1 MHz.
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Transmitting and receiving electric field and plane wave antenna set covering 1 KHz to 10 GHz.
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Receivers or spectrum analyzers covering 1 KHz to 10 GHz with adequate dynamic range to measure the attenuation.
The magnetic and electric field attenuation tests shall be performed with the antennas located directly opposite each other and separated by a distance of 61 centimeters (24 inches) plus the wall thickness.
Magnetic field attenuation shall be measured at 1 kHz, 10 kHz, 100 kHz, and 1 MHz.
Electric field attenuation shall be measured at 1 kHz, 10 kHz, 100 kHz, 1 MHz, and 10 MHz.
The plane wave attenuation test shall be performed with the transmitting antenna placed at least 6 meters distant from the enclosure surface (if possible) and the receiving antenna set no closer than 5.1 centimeters (2 inches) from the wall.
Plane wave attenuation shall be measured at 100 MHz, 400 MHz, 1 GHz, and 10 GHz frequencies.
Attenuation tests shall be performed around the entire door frame, air ducts, filters and through any accessible joint or penetration.
The magnitude and location of the maximum signal level emanating from the enclosure shall be determined by testing at least four locations.
The selection of testing locations should include not only walls, but the floor and ceiling too.
EMCTEST Technologies is a leading test laboratory in Italy and Europe for
electromagnetic shielding effectiveness testing. Thanks to advanced instrumentation and extensive experience in the field, we perform
measurements from 10 kHz to 110 GHz on materials and devices intended for
industrial, telecommunications, medical, military, automotive, railway, marine, aerospace, scientific, governmental, and civil applications.
Typical Test Frequencies
- Low frequency: 10 kHz, 100 kHz, 500 kHz, 1 MHz
- Mid frequency: 10 MHz, 30 MHz, 100 MHz, 433 MHz, 700 MHz, 800 MHz, 900 MHz
- High frequency (RF and microwave): 1 GHz, 1.5 GHz, 2.4 GHz (ISM band), 3 GHz, 5 GHz, 5.8 GHz, 6 GHz, 10 GHz
- Very high frequency: 17 GHz, 18 GHz, 24 GHz (ISM – Industrial, Scientific, and Medical bands), 26.5 GHz, 30 GHz, 35 GHz, 40 GHz, 50 GHz, 60 GHz (wireless communication and radar applications)
- Millimeter wave: 75 GHz, 77 GHz (automotive radar systems), 94 GHz, 100 GHz, 110 GHz
Our test laboratory is equipped to perform shielding effectiveness measurements up to 110 GHz.
You can read more on the home page. If you are looking for a laboratory to test your product, you are in the right place – feel free to contact us by email or phone.
Measurements are made according to customer specifications or in accordance with the main standards as below:
