不论用Polar还用TEK阻抗测试仪,在显示阻抗测试波形时绝对不是一条直线,而是出现一条弯曲的线,此线即会出现波峰(最大值)及波谷(最小值),也正是反映板阻抗实际情况,因此需均要考虑最大值和最小值均合格,才算合格。 ----- Original Message ----- From: sungaixian_007 To: [log in to unmask] Sent: Tuesday, September 21, 2010 10:04 AM Subject: [TGAsia] 阻抗测试问题 各位: 最近收一个供应商很有意思的话题.特向大家请教. 关于阻抗测试的结果的判定是选取单个测试条阻抗测试的平均值还是最大值与最小值同标准进行判定? 例如: 阻抗要求为 100+/-10% (MIN 90,MAX110) 测试仪器显示某个零件测试结果是: MIN :88 ,MAX:99 平均值:93. IPC 标准或者是其他的规范有没有说明是 必须要 MIN 与MAX 都在公差范围内合格才可以判定合格,还是可以直接用平均值来进行判定? 供应商说他的测试结果是符合要求的,因为平均值在要求范围之内? Sunny ------------------------------------------------------------------------------ 全国最低价,天天在家冲照片,24小时发货上门! ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________ ______________________________________________________________________ This email has been scanned by the MessageLabs Email Security System. For more information please contact helpdesk at x2960 or [log in to unmask] ______________________________________________________________________