Measuring the current

Before we receive the ordered SCR, I found an old SCR in the lab (don't know it's good or not). I installed it and tried to measure. Unfortunately, this SCR was bad, I could not monitor the current even I could measure the input voltage. I used the current clamp to measure the current on the X-ray gun high voltage power supply, I obtained the current waveform. The high voltage power supply for x-ray gun was designed using the similar design of M03.