The power supplies used for the plasma torches are usually SCR controlled and have a large ripple factor. This is due to the fact that the currents in the torch are of the order of hundreds of amperes which prohibit effective filtering of the ripple. The voltage and current vary as per the ripple in the power supply and causes plasma jet to fluctuate. To record these fluctuations, the jet coming out from a D.C. plasma torch operating at atmospheric pressure was imaged using high speed camera at the rate of 3000 frame per second. Light emitted from a well defined zone in the plume was collected using an optical fibre and a Photo Multiplier Tube. Current, voltage and PMT signals were recorded simultaneously using a digital storage oscilloscope (DSO). The fast camera recorded the images for 25 ms and the starting pulse from the camera was used to trigger the DSO for recording voltage, current and optical signals. Each image of the plume recorded by the fast camera was correlated wi.