CHO-CELL™ Shielded Vent Panels - Chomerics Division - #1

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US Headquarters TEL +(1) 781-935-4850 FAX +(1) 781-933-4318 • www.chomerics.com Europe TEL +(44) 1628 404000 FAX +(44) 1628 404090 Asia Pacific TEL +(852) 2 428 8008 FAX +(852) 2 423 8253 South America TEL +(55) 11 3917 1099 FAX +(55) 11 3917 0817 1 CHO-CELL Shielded Vents CHO-CELL panels are Chomerics’ very high performance shielded honeycomb air vents, especially designed for high frequency environments and to meet TEMPEST specifications. They provide greater than 90 dB attenuation between 200 MHz and 10 GHz. Shielding is typically 30 dB better than conventional panels, achieved by unique design features, which include a CHO-SEAL mounting gasket. CHO-CELL vents are free of polarization effects, provide low air resistance, and are lightweight. They Figure 1 Insertion Loss Through Apertures The above data illustrates insertion loss typically achieved through open apertures from 24 in. to 2 in. square (per MIL-STD-285). SPECIFICATIONS Honeycomb 0.002 in. (0.051 mm) foil, 0.125 in. (3.2 mm) cells, 0.500 in. (12.7 mm) thick aluminum per MIL-C-7438; finish: electroless nickel per MIL-C-26074C, Class 1, Grade A, 0.0015 in. (0.04 mm) thick Frame Aluminum per QQ-A-200/8 alloy 6061-T4; finish: electroless nickel per MIL-C-26074C, Class 1, Grade A, 0.0015 in. (0.04 mm) thick Mounting Gasket CHO-SEAL 1215 silver-plated-copper filled silicone Sizes Per customer requirements, up to 24 x 24 in. (61 x 61 cm) max. Mounting Holes Thru holes, 0.188 in. (4.8 mm) dia. (for #8 screws) [2-3 in. (5.1-7.6 cm) spacing recommended] ................ .... .... .... .... .... .... .... ................ ............ ............ ............ ............ ............ ............ ............ CHO-SEAL Gasket Conductive Epoxy Honeycomb Core Support Bushing Frame 0.188 in. (4.8 mm) Dia. Mounting Hole Cross Section of CHO-CELL Vent are offered in custom configurations, with thru-hole mounting. Ordering Procedure CHO-CELL panels are made to customer size specifications up to 24 x 24 in. (61 x 61 cm). Part numbers will be supplied by Chomerics. Contact our Applications Engineering Department. Figure 2 Alternate Extrusions for CHO-CELL Construction, in. (mm). Others available, please inquire. 10 10 100 1000 10000 20 30 40 50 60 70 Frequency (MHz) Insertion Loss (dB) 2 in. (5.1 cm) Opening 4 in. (10.2 cm) Opening 6 in. (15.2 cm) Opening 12 in. (30.5 cm) Opening 24 in. (61.0 cm) Opening EMI SHIELDED VENTS CHO-CELL™ Shielded Vent Panels Table 1 See page 168 for shielding effectiveness information. (mm dimensions in parentheses) 0.062 (1.57) 1.125 (28.58) 0.625 (15.88) 0.062 (1.57) 0.500 (12.70) 1.125 (28.58) 0.625 (15.88) 1.437(36.50) 0.375 (9.52) 0.500 (12.70) 0.875 (22.22) 0.062 (1.57) 0.062 (1.57) 0.375 (9.52) 0.312 (7.92) 0.060 (1.52) 0.080 (2.03) 0.190 (4.83) 1.040 (26.42) 1.125 (28.58) 0.733 (18.62) 1.125 (28.58) 0.312 (7.92) 1.125 (28.58) 0.392 (9.66) 0.540 (13.72) 0.733 (18.62) 0.060 (1.52) 0.190 (4.83) 0.080 (2.03) 0.060 (1.52) 0.190 (4.83) 0.750 (19.05) 0.733 (18.62) 0.380 (9.64) 0.380 (9.64) 1.000 (25.40) 0.400 (10.16) 0.192 (4.88) 0.080 (2.30) 0.380 (9.64) 61-125 61-123 0.062 (1.57) 0.625 (15.88) 0.625 (15.88) 61-195 0.062 (1.57) 0.625 (15.88) 0.375 (9.53) 61-158 61-126 61-311 61-183 61-127 61-198 61-161 0.080 (2.03) Aluminum Extrusions 61-129 0.062 (1.57) 0.500 (12.70) 0.500 (12.70) 61-265 0.062 (1.57) 0.375 (9.53) 0.500 (12.70)