AC noise from elevator

（中文在後）

AC noise generated from the building's elevator moving, is quite visible from Chart#2 compared to the baseline Chart#1. The so called "EMI Meter" from Green Wave also reports up to 1000mV of noise compared to the baseline's 46mv. Unfortunately, no AC filter including the one from Green Wave, or even an ISO transformer can block such noise.

建物裡的電梯動作時產生的電源污染，可以從比較兩個附圖裡看出。那個號稱測EMI的錶，也顯示超過數百甚至上1000的數值，比平靜時46高出很多。而且所有的濾波裝置，甚至隔離變壓器，對這種頻段的雜訊似乎都沒什麼效果。