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Can not read data from E5052A

Question asked by courtney on May 17, 2011

I have a problem need help. I use to measure phasenoise by SSA E5052A.
But the data I read from SSA is always Null. I tried both the command ioDmm.Readstring() and the command Receive(id,addr, buff, stopend) to read.
It is normal when I use VBA. But with, it is always Null.
Could you give me any advice?