Hi,
I have been assigned to do some "switching power" ESD testing recently. I a m a beginner engineer. So, please forgive me and do not be offended, if I a sk dumb beginner's questions.
I am using the following setup to test the supplies
Questions:
- I found that that VCP is grounded to Ground Reference plane (GRP) via tw o resistors of value 470Kohm in series. Why 470k and two of them?
- The ESD gun air discharge looks like the following ( Human Body Model)
How can I calculate how much charge this waveform has delivered? Plus if I charge the VCP and HCP plane with this waveform then how can I calculate th e " Electric" and " Magnetic field" generated by this waveform.
I found the following device to measure the electric field of HBM
But sure that this probe can work for this purpose.
- How can I measure input and output impedance of a fly back transformer b ased switching power supply? I found the following paper formatting link
I was unable to understand the whole paper but I think that a separate devi ce is required to measure the input and output impedance of the supply? Is it possible that I can buy one?
mel