The　nose-to-nose　calibration　theory　has　attracted　attention　because　it　achieved　the　self-calibration　of　the　sampling　oscilloscope　with　whatever　bandwidth.　But　the　early　simulation　study　was　focused　on　the　key　signal,　kick-out　pulse.　We　simulated　from　the　different　points,　and　the　fully　simulation　aimed　at　microwave　diode　sampler　head　was　processed　with　PSPICE　software　in　this　paper.