Differences in test results may occur when the discharge gun is different.

The waveforms of TC and GT are different, so they are not completely equivalent.

Other factors include the angle of the discharge gun when discharging to the EUT, the routing of the return cable, and the overall layout and wiring including the EUT. If these are not made the same, they will affect the test results.

For waveform measurement as well, the waveform changes depending on the discharge gun angle and cable routing.

If measurement is performed on a simplified target without using a discharge gun fixing stand, even if the discharge gun angle and cable routing are intended to be the same, they are not fixed and may affect the waveform. (At the very least, it cannot be considered the same environment.)

* Regarding ringing appearing in the waveform, either the measurement environment or deterioration of the discharge gun may be the cause.