Page 126 - GETELEC catalogue US 2020

EMI shielded windows

Electromagnetic interference (EMI) can be described as
any electrical disturbance, whether a signal or noise, wich
interferes with electrical equipment’s ability to operate
correctly.

OPTIC screened windows provide electromagnetic protection
to the front of control screens, measurement indicators and
displays while still providing good display visibility.

Examples of use :
• Military telecommunications radio
• Telecoms bay and cabinet display
• Hardened computer screen

Screened windows can be made from glass or polycarbonate to suit the
operating conditions and desired performance.

Shielding is by means of a fine mesh metal screen placed between the two
sheets of glass or polycarbonate. The metal screen is treated to darken it
for optimal visual performance.

Earthing is via a conductive silver busbar located around the periphery
of the filter. It can be moved to order, to the filter’s front or rear surface.
Continuity is then ensured by means of a conductive elastomer seal. Other
EMI shielding window means of ensuring continuity are also possible.

Fine-mesh Number Mesh Field E attenuation (dB) Plane wave attenuation (dB) Transmission
screen O.P.I of cells per diameter 1 MHz 10 MHz 100 400 16 Hz 10 GHz (%)
cm² (mm) MHz MHz
70 27 0.08 110 111 98 68 64 38 62
100 39 0.03 > 120 > 120 100 67 54 50 81
Copper
100 39 0.05 107 111 85 70 58 - 64
145 57 0.05 128 112 106 84 82 64 51
+50 +19 0.03 100 100 75 60 50 37 90
50 19 0.05 94 90 82 58 55 28 81
+80 +31 0.05 106 88 82 64 60 34 71
+80x60 +31 x 23 0.03 102 105 103 75 60 43 84
Stainless
+100 +39 0.03 128 112 92 80 86 74 81
+165 +64 0.05 137 124 106 100 81 61 45
+200 +78 0.04 128 108 98 88 86 68 46
+230 +90 0.03 140 120 95 94 80 60 46

"+" means silver plating before darkening
This values below are indicative only. Testing was on a sample of fine-mesh screens measuring 300 mm x 300 mm as per
MIL-STD-285 standard. Transmission values are theoretical only, measured at the fine-mesh screen only.

Dimensions and thickness
OPTIC screened windows are made to customer specifications. Standard thicknesses are 2.5 mm, 3.0 mm,
4 mm and 6 mm. Other thicknesses are available on request.

375 avenue Morane Saulnier 78530 - Buc, France www.getelec.com
125 Tel : +33 1 39 20 42 42 | info@getelec.com