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97-520 Datasheet(PDF) 51 Page - Laird Tech Smart Technology |
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97-520 Datasheet(HTML) 51 Page - Laird Tech Smart Technology |
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51 / 64 page  FINGERSTOCK GASKETS AND METAL GROUNDING PRODUCTS SHIELDING EFFECTIVENESS CHARTS 2.38 www.lairdtech.com All dimensions shown are in inches (millimeters) unless otherwise specified. -02 (Cu) -08 (Sn) 140 120 100 80 60 40 20 0 9 kHz 1 MHz 1 GHz 18 GHz 100 kHz 10 MHz 200 MHz 10 GHz Frequency RADIATED PART NO. 0097-0500-XX -02 (Cu) -08 (Sn) 140 120 100 80 60 40 20 10 kHz 1 MHz 100 MHz 100 kHz 10 MHz 1 GHz Frequency TRANSFER IMPEDANCE PART NO. 0097-0500-XX ALL-PURPOSE GASKET PART NO. 0097-0500-XX TABLE 1. MIL-DTL-83528* RADIATED SHIELDING EFFECTIVENESS (dB) * Fixture design (clamping vs. bolt configuration) ** Projected H-Field data STRIP METAL GASKETS The graphs and tables of radiated and transfer impedance measurements in this section compare beryllium copper (-02) with either tin plating (-08) or bright tin plating (-17), in various gasket configurations. Obtaining the same level of shielding effectiveness shown in the following tested gaskets to MIL-DTL-83528, Para. 4.6.12 or SAE ARP 1705 may not be accomplished without an equivalent test flange/fixture configuration. Many mechanical factors (size, tolerances, cover plate fastening/holding, flange stiffness, etc.) influence performance by enhancing or lowering shielding effectiveness. The data presented provides a valuable electrical design tool for gasket material comparison/selection. Radiated shielding effectiveness values can be approximately 38 dB higher than transfer impedance shielding effectiveness values. This is because the measurement is influenced by the characteristic impedance of the transmission line fixture with respect to the localized ground reference. The specified MIL-DTL-83528 radiated fixture aperature is 24.000 in. x 24.000 in. (609.600 mm x 609.600 mm), This aperature size results in attenuation, along with reflections and resonances, which creates a test anomaly at 200 MHz, thus limiting the measurable shielding effectiveness. The specimen configuration as specified in MIL-DTL-83528 is a 1.000 in. (25.400 mm) wide flat strip; in contrast, the data presented in this section is based on a wide range of specimen configurations for practical shielding design applications. Note: For all gaskets, shielding effectiveness measurements were taken at recommended compression. FREQUENCY -02 (CU) -08 (SN) MAGNETIC 9 kHz 5 5 100 kHz 44 45 **1 MHz 83 85 **10 MHz 121 125 PLANE WAVE 200 MHz 113 114 1 GHz 125 127 10 GHz 72 73 18 GHz 65 61 TABLE 2. SAE ARP 1705 TRANSFER IMPEDANCE SHIELDING EFFECTIVENESS (dB) FREQUENCY -02 (CU) -08 (SN) 10 kHz 97 97 100 kHz 122 122 1 MHz 121 126 10 MHz 115 116 100 MHz 105 105 1 GHz 87 90 LT-3034 Metals_catalog 10/8/04 10:31 AM Page 2.38 |
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