# This is a dumb question

**URL:** <https://forum.quantasylum.com/t/this-is-a-dumb-question/876>\
**Category:** Uncategorized\
**Created:** [May 1, 2023, 7:42pm UTC](https://forum.quantasylum.com/t/this-is-a-dumb-question/876 "2023-05-01T19:42:25Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![Moto](https://avatars.discourse-cdn.com/v4/letter/m/2bfe46/32.png) [@Moto](https://forum.quantasylum.com/u/Moto)\
**Post date:** [May 1, 2023, 7:42pm UTC](https://forum.quantasylum.com/t/this-is-a-dumb-question/876/1 "2023-05-01T19:42:25Z")

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I have been away from the QA403 for awhile and was just trying a loopback test. here is the screenshot. why when the generator is set at 0dbv does rms voltage change with whatever attenuation is set? here it is showing 2vrms.

 ![image](https://canada1.discourse-cdn.com/flex032/uploads/quantasylum/original/2X/f/fd29486c1eea95da82f57c565fbca825da1f1366.png)

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**Author:** ![matt](https://avatars.discourse-cdn.com/v4/letter/m/a6a055/32.png) [@matt](https://forum.quantasylum.com/u/matt)\
**Post date:** [May 2, 2023, 7:22pm UTC](https://forum.quantasylum.com/t/this-is-a-dumb-question/876/2 "2023-05-02T19:22:57Z")

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There is an issue being looked at where switching from, say, 0 to 24 dBV input isn’t resulting in an audible relay click, and the input levels are thus out of sync. Re-starting the software doesn’t fix it, but re-plugging the hardware does. Do you hear a relay click when you switch from atten off to atten on full scale input? (or vice versa)?

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**Author:** ![Moto](https://avatars.discourse-cdn.com/v4/letter/m/2bfe46/32.png) [@Moto](https://forum.quantasylum.com/u/Moto)\
**Post date:** [May 2, 2023, 10:43pm UTC](https://forum.quantasylum.com/t/this-is-a-dumb-question/876/3 "2023-05-02T22:43:56Z")

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I had already unplugged it when I saw this. When I replugged it and tested, it now works and the relay clicks.