Is it proper to use a 1 ohm resistor on GROUND side of return negative line back to DC power supply , and then measure the low volts with scope probe over the resistor. The Amp flow will be the same as the volts. I = E / R . 6A = 6v read over 1ohm resistor is 6 amps pulse current. The high voltage diode DC at same time firing to ground would not interfere.