40m有源晶振,按引脚说明已正确连接,但测量的时候,发现除了正常的40m方波外,在低频段还有一大概为30hz得方波,不知道为什么,试了多种方法都无法将他消除.向各位请教,大家给点意见吧~~~~~~
测试条件:示波器是TDS3012,探头10X衰减,全带宽(约100M)
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