We will assign pattern limits based on actual measurements of the test samples. The conductor width measurement tolerance is as follows: -Conductor width of 0.12 mm (5 mil) or greater, measured width may not be greater than ±0.025 mm (1 mil) of the requested width. -Conductor less than 0.12 mm (5 mil), measured width may not be greater than ±20% of the requested width. The attachment containing Figures 10.1, 10.2, and 10.3 (taken from the UL Standard for Safety for Printed-Wiring Boards, UL 796), illustrate typical test patterns. The test pattern should appear on both sides of the sample, one side being the mirror image of the other. If you desire Recognition for single sided printed wiring boards only, the test pattern need only appear on one side of the sample. You may want to submit various maximum area diameter sizes as Recognition will be granted based upon the largest compliant circle. If the maximum unpierced diameter won't fit on the test pattern, please provide a separate set of samples. You may etch these into either a circle or a square. DELAMINATION ONLY SAMPLES - The conductor pattern that you use for Delamination samples may be either an etched circle or a square. It should be of the largest diameter unpierced area for which you wish or have Recognition. The attachment containing Figures 10.1, 10.2, and 10.3 (taken from the UL Standard for Safety for Printed-Wiring Boards, UL 796), illustrate how to determine the maximum unpierced conductor area and a typical delamination test pattern. The maximum unpierced conductor area may exceed the diameter requested, but may not be less than the requested; otherwise the Recognition may be limited to the maximum area diameter submitted. MULTILAYER CONSTRUCTION - For multilayer boards, the same conductor pattern must be used on the external and internal layers. Position the unpierced areas directly over each other. The multilayer sample construction shall include two or more internal conductor layers. One of the internal conductor layers must be the maximum internal conductor thickness. The sample must also include the minimum laminate (core) and B-Stage (prepreg) sheet thicknesses to be Recognized for the Printed Wiring Board Type. For additional instructions on multilayer sample construction, refer to UL Standard for Safety for Printed-Wiring Boards, UL 796, Section 17. Note - The board total build-up thickness should be at the thickness or within the range specified in the attached sample requirements.
We will assign pattern limits based on actual measurements of the test samples. <br>The conductor width measurement tolerance is as follows: <br> -Conductor width of 0.12 mm (5 mil) or greater, measured width may not be greater than ±0.025 mm (1 mil) <br> of the requested width. <br> -Conductor less than 0.12 mm (5 mil), measured width may not be greater than ±20% of the requested width. <br>The attachment containing Figures 10.1, 10.2, and 10.3 (taken from the UL Standard for Safety for Printed-Wiring <br> Boards, UL 796), illustrate typical test patterns. <br>The test pattern should appear on both sides of the sample, one side being the mirror image of the other. <br> If you desire Recognition for single sided printed wiring boards only, the test pattern need only appear on one <br> side of the sample. <br>You may want to submit various maximum area diameter sizes as Recognition will be granted based upon the <br> largest compliant circle. <br>If the maximum unpierced diameter won't fit on the test pattern, please provide a separate set of samples. <br> You may etch these into either a circle or a square. <br> <br>DELAMINATION ONLY SAMPLES - The conductor pattern that you use for Delamination samples may be either <br> an etched circle or a square. It should be of the largest diameter unpierced area for which you wish or have <br> Recognition. <br>The attachment containing Figures 10.1, 10.2, and 10.3 (taken from the UL Standard for Safety for Printed-Wiring <br> Boards, UL 796), illustrate how to determine the maximum unpierced conductor area and a typical delamination <br> test pattern. <br>The maximum unpierced conductor area may exceed the diameter requested, but may not be less than the <br> requested; otherwise the Recognition may be limited to the maximum area diameter submitted. <br> <br>MULTILAYER CONSTRUCTION - For multilayer boards, the same conductor pattern must be used on the <br> external and internal layers. Position the unpierced areas directly over each other. <br>The multilayer sample construction shall include two or more internal conductor layers. One of the internal <br> conductor layers must be the maximum internal conductor thickness. The sample must also include the <br> minimum laminate (core) and B-Stage (prepreg) sheet thicknesses to be Recognized for the Printed Wiring <br> Board Type. <br> <br>For additional instructions on multilayer sample construction, refer to UL Standard for Safety for Printed-Wiring <br> Boards, UL 796, Section 17. <br> <br>Note - The board total build-up thickness should be at the thickness or within the range specified in the attached <br> sample requirements.
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