Paul
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Yawei,
maybe you should try to find out whether interference is due to power supply (220V or whatever) or due to EMI. In the first case you could try to use seperate power nodes. Typically you have 3 phases of power supply (at least over here in Europe) and you could use seperate ones.
But I expect it to be EMI, so that wouldn't help. In that case, I don't know... Maybe go ask Agilent, all equipment comes from them...
Good luck, and please keep us updated.
Paul
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