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PXIe-4138 not pulsing properly

I have developed this VI from an example with the aim to pulse voltage through 1 SMU while supplying DC voltage and continuously measure through another SMU. The pulsing SMU is not showing a clear pulse, however, it is  alternating between -ve and +ve values (see photo). what could be the issue?asdfasdf.PNGsfgsdfgdfg.PNG 

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