Removing Noise from time across signal data I am new to the field of signal processing. I have sensor data (Impedance across time), that output is like this. 

On the right side, I have a noisy signal portion in my data, marked by the red block. I want to remove this noise, its a hand movement artifact noise. 

How can I remove this noise?

I have tried to find the frequency of the noise by applying FFT on the data file attached below but I got this result


Data file
Is the width of your 5000-amplitude pulse always the same? If so, then just discard your signal samples that occur after seven seconds. If the width of your 5000-amplitude pulse varies then try lowpass filtering (experimenting with different lowpass filter bandwidths) your signal to see if the filtered signal contains the information you desire. If the width of your 5000-amplitude pulse varies then you might try differentiating your signal and measuring the time instant $t_o$ of the large negative amplitude transition. Then just discard your original signal samples that occur after $t_o$ seconds. Good Luck.