FR4 PCB 热膨胀在线计算器
计算 FR4 PCB 在 X/Y 方向的热膨胀（毫米 mm）。典型温度差默认值为 65°C，即 20°C 室温和 85°C 部件的最大温度额定值之间的差值。默认的 13ppm/°C 热膨胀系数来自此网站。
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TechOverflow calculators:
You can enter values with SI suffixes like 12.2m (equivalent to 0.012) or 14k (14000) or 32u (0.000032).
The results are calculated while you type and shown directly below the calculator, so there is no need to press return or click on a Calculate button.
You can enter values with SI suffixes like 12.2m (equivalent to 0.012) or 14k (14000) or 32u (0.000032).
The results are calculated while you type and shown directly below the calculator, so there is no need to press return or click on a Calculate button.
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ppm/°C
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