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You have a bad or weak ground, or the UPS is creating a magnetic field from the power supply in it that is being picked up and amplified by the PA system. Move them farther apart and see if the hum diminishes.
Some UPS's don't produce a clean sine wave output, causing electromagnetic interference (EMI). A distorted 60 Hz sine wave will have many harmonics that can be passed through to the PA amplifier output.
Your UPS may also have a bad filter capicitor.
AnswerI agree 100%, however, you could also try shielding your units. Try putting tin foil on the iniside of the devices. Make sure that the tin foil doesnt cause any short circuits.ANSWER
DO NOT PUT TIN FOIL IN YOUR UPS!!! While it is true that your UPS will produce EMI, the power emitted is very limited by distance. Unless you are running the speaker wire through your UPS, and inducing the EMI energy, there will not be enough to reach your speaker coils. Placing conducting material inside electrical apparatus is nothing short of idiotic.
The more likely cause of your noise distortion comes from a UPS being a "switched mode" power supply device (if it is a small UPS) or a the Pulse Width Modulated (PWM) output devices of a larger UPS. Both of these devices cause distortion of the sine wave on the output of the UPS and, surprising to many, on the input (supply side) electrical system. More than likely the electrical system, located on the same transformer - possibly fed from the same breaker box - is carrying that distortion out to the speaker coil through the speaker system power supply. You could put a small isolation transformer feeding the power supply of the speaker system. This should work whether the UPS is feeding the speaker system or not...as long as it is in between the speaker system power supply and the UPS.
Once more...Do not put tin foil inside your UPS.
"When all else fails, read the instructions. When things get even worse, maybe it's time to finally read the specifications."
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What is an offline ups?
In an on-line UPS the load is always being powered by the UPS and it is constantly charging so there is no switchover time. In an off line system, the system detects the lack of voltage and switches to the alternate source of power. Usually this would be a generator that would start after a short period of no supply voltage. Some critical systems would use a short duration direct system with backup generator kicking in after a short period.
What are the information systems in ups?
Some key information systems used by UPS include their package tracking system (UPS Tracking), customer relationship management system (CRM), order processing system, and inventory management system. These systems help UPS efficiently track shipments, manage customer relationships, process orders, and keep track of inventory levels.
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It is thought that soda causes hick-ups because of the fizziness.
Can wearing shape-ups cause seizures?
No.
Can a phone system be plugged into same wall outlet as ups?
If your phone system is a PBX then yes you can plug it on the same outlet where a UPS is plugged. You can even plug your PBX system to the UPS so when there's a power failure you can still have few minutes source to power your phone system.
What problem do UPS'S information system solve?
There are several problems that need to be solved by the UPS information systems. One would be routing the delivery truck to shorten the route distance traveled for the packages that are on the truck.
What is system back ups?
A back-up system wold be anything that takes over in the event the main system fails. An example would be a back-up generator in case the power goes out.
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Crunches and sit ups do not cause the uterus to drop or fall directly. This may happen if weight is lost.
What device protect a system against blackouts?
The UPS
How does the order tracking system for UPS work?
The order tracking system for UPS works by using a tracking number. When a package is put into the system it has a special number this number is tracked by everyone handling the package.
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I would suggest pull-ups/chin-ups.
