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Post subject: Re: amp hum solutions
Posted: Mon Mar 02, 2020 9:34 am
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Your UPS is only as reliable as your grounding system.

Without a properly installed grounding system, your UPS won't function correctly. A grounding system allows circuit protection to clear a ground fault, and provides paths for diverting surge current away from the UPS and for removing undesirable currents from the critical load. So what can you do to ensure your grounding system allows your UPS to do its job?

More here;
https://www.ecmweb.com/content/article/ ... d-neutrals


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Post subject: Re: amp hum solutions
Posted: Mon Mar 02, 2020 11:50 am
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Indeed, it is crucial to have a functioning ground.

Either way, OP will want to confirm that. But sometimes even with a ground, you will get hum and sometimes the cheapest option is to isolate the amp from the mains (vs. having an electrician troubleshoot for hour$ just to find out all he can tell you is "I have no idea why your amp makes that sound. Maybe it's broken").

Here is what APC says about using their products without a ground:

Although the Surge Arrest, Back-UPS, Back-UPS Pro, Smart-UPS, Smart-UPS V/S, and Symmetra LX products may appear to work properly without a ground, APC always recommends that these units are grounded properly. Grounding is not for functionality, but rather for safety. Numerous issues are involved when there is no ground, including potential for electric shock, signal attenuation and unpredictable operation. Therefore, APC does not support using these products in any ungrounded application, even with an earth leakage monitor or other such device in place to alarm in case of excess current or drop in resistance.

https://www.apc.com/us/en/faqs/FA157422/


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Post subject: Re: amp hum solutions
Posted: Mon Mar 02, 2020 2:47 pm
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A UPS use is for in case of no more power from wall outlet, no more 120 volts
In any case ground is alway there. And must be there.

Ground is not only to protect user.
In a guitar amp some noise are send to the amp chassis or chassis act like antenna.
A ground is a wire connected to the chassis to send this noise to the earth by the wall outlet ground to make the amp silent.

Can we use a UPS to sop noise when there is no ground ? I don't know.

Yesterday I ask to OP ; Are there factories around, power plants, electric trains ?

No answer :(


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Post subject: Re: amp hum solutions
Posted: Tue Mar 03, 2020 9:39 am
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Here is a simple diagram of how a UPS works. The mains charge the battery; the battery powers the device. The device you connect to the UPS is isolated from the building/house wiring, but not the ground.

Image


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Post subject: Re: amp hum solutions
Posted: Tue Mar 03, 2020 9:57 am
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ghost_of_strings wrote:
Here is a simple diagram of how a UPS works. The mains charge the battery; the battery powers the device. The device you connect to the UPS is isolated from the building/house wiring, but not the ground.



That is what I wrote, ground is a must .


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Post subject: Re: amp hum solutions
Posted: Tue Mar 03, 2020 4:58 pm
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ghost_of_strings wrote:
Indeed, it is crucial to have a functioning ground.

Either way, OP will want to confirm that.

Me too. :D


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Post subject: Re: amp hum solutions
Posted: Thu Mar 05, 2020 6:36 pm
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Note about outlet testers -- everything should be unplugged from every outlet connected to the circuit you're testing. If things are plugged in, you can sometimes get a false "ground ok" light (even if the things are turned off).


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