Hello kai,

Thank U for nice explanation , But which equation you used to arrive at
47.7 ns ? Please tell me how have you calculated tau (time constant) ?
How have you arrieved to " after 1ns voltage drop across transorb is about 5.99v." ?
If we use a 10K resistance before Transorb how to calculate time constant.
Sorry for bothering you so much as I am a Computer Engineer and
new to this . I also want to know can we protect the analog ports with
transorb also and omit the ISOLATION AMPLIFIER ? (current loop case 4ma to 20ma )

Thanks a lot!
J. John