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DAQ Interference among channels

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Hi there,

I am suffering from an interference problem now while I am doing some DAQ work.

I am using LabVIEW to control the DAQ system to grab voltage signal from several thermocouples. The results make sense for me but I found there seems to be some interence issues among all the channels: from the plot attached it is clear to find some simultaneous fluctuation on all the curves (see the portions of curves in the numbered boxes 1, 2, 3 and 4).

 

My block diagram is also attached here (which seems to be messy and vulgar-designed for you guys since I am a newbie on LabVIEW)

 

I am wondering if this is an interference issue with hardware or a problem on my programming, and please lemme know how to handle this problem to reduce (or even cancel the interferences).

Thanks.

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Lynn

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Thanks!

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