# QA472 picking up mains noise

**URL:** https://forum.quantasylum.com/t/qa472-picking-up-mains-noise/2089
**Category:** Uncategorized
**Created:** [November 3, 2025, 1:22am UTC](https://forum.quantasylum.com/t/qa472-picking-up-mains-noise/2089 "2025-11-03T01:22:16Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![mnaganov](https://yyz2.discourse-cdn.com/flex032/user_avatar/forum.quantasylum.com/mnaganov/32/552_2.png) [@mnaganov](https://forum.quantasylum.com/u/mnaganov)
#### Post date: [November 4, 2025, 5:30pm UTC](https://forum.quantasylum.com/t/qa472-picking-up-mains-noise/2089/2 "2025-11-04T17:30:04Z")

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@matt I’m looking at your [QA472 Measurements](https://forum.quantasylum.com/t/qa472-measurements/1006) and they look better to me—less noise. Could you please check if my noise profiles look as expected, or maybe something is wrong here. Should I be shorting unused inputs as you have described in your post? Should I try giving some sine input—besides QA401 I also have “Victor’s oscillator” 🙂

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