Pspice simulation

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http://forum.allaboutcircuits.com – Hello, I have set a signal with the VPWL. I am using voltmeter to see what kind of signal I have set up in VPWL. If I am adding a 10k resistor under VPWL source, it is changing my signal which comes from VPWL source. Could somebody explain me why it is happening? If I change any other parts they dont affect my VPWL source. Uploaded with ImageShack.us (Embedded)