The area correspond to the the analog first stage. PCB is under the shield/radiator bolted in contact with the back side of the board but on the BNC side the plate is mostly just in proximity with the PCB by the BNC screws. See Dave's ua-cam.com/video/KQF4UzLPpr0/v-deo.htmlsi=eqAdEhbG495SEa85&t=265
![[分享] RIGOL MHO5000 波德圖量測功能 / 功能更進階 / 新品上市](http://i.ytimg.com/vi/VkWEwMKLNK0/mqdefault.jpg)
Interesting that it picks up that much noise even with terminators. I have the 914 model and will test to see if it has the same issue.
The area correspond to the the analog first stage. PCB is under the shield/radiator bolted in contact with the back side of the board but on the BNC side the plate is mostly just in proximity with the PCB by the BNC screws. See Dave's ua-cam.com/video/KQF4UzLPpr0/v-deo.htmlsi=eqAdEhbG495SEa85&t=265
Promo>SM 💋