Difference signal displayed in Oscilloscope and LabVIEW using NI ElVIS II

[Hohohihijj]

Hi everyone,

I used ELVIS II to generate a contaminated ECG signal using DAQ and NI ElVIS II. However, the acquired signal in oscilloscope has some abnormal points. Can you explain why that happends and how to fix this problem? 

[BoKnows]

If you send a clean signal, instead of the contaminated signal, do you still see these marks on the o-scope?  Do you see them with anything else?

[Hohohihijj]

I have solved this problem by changing mode from N samples to Continuous samples in DAQ config. As you said, the problem doesnt happend when the signal is clean.