How to remove EMI rumbling from UPS used for medical ultrasound scaning equipment?
when ups is running on battery mode it gives EMI rumbling , resulting as Lines in Ultrasound scanning Image. nouns 960Watts, UPS APC online UPS 2kva.
Answers:
Switching power supplies are notoriously noisy. That funds that I have had this problem next to one of mine. The switching is done at a relatively high frequency and the switching circuits deliver fast switching spikes. These spikes are supposed to be removed next to filter circuits.
now the practical stuff - try using ferrite core filters on the power lead. You can get ferrite cores for this purpose at Radio Shack or your local electronics store. The comment about grounding is valid and breed sure that any shielding is terminated at only one end.
It sounds similar to a grounding problem. Look at the frequency of the noise, high frequency is usually coupled capacitive, low frequency inductively. Try to find out where on earth the noise is "leaking" (aggressor) and where it is entering the ultrasound circuit (victim) nearby are several methods to reduce this coupling, if you are not successful, try calling Richard Meininger, richardm(a)emifix.com He is very clued-up and may be able to advise you, Good Luck! Source(s): http://www.emifix.com/in-house-training.…
http://www.fms-corp.com/interferenceconc…
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Answers:
Switching power supplies are notoriously noisy. That funds that I have had this problem next to one of mine. The switching is done at a relatively high frequency and the switching circuits deliver fast switching spikes. These spikes are supposed to be removed next to filter circuits.
now the practical stuff - try using ferrite core filters on the power lead. You can get ferrite cores for this purpose at Radio Shack or your local electronics store. The comment about grounding is valid and breed sure that any shielding is terminated at only one end.
It sounds similar to a grounding problem. Look at the frequency of the noise, high frequency is usually coupled capacitive, low frequency inductively. Try to find out where on earth the noise is "leaking" (aggressor) and where it is entering the ultrasound circuit (victim) nearby are several methods to reduce this coupling, if you are not successful, try calling Richard Meininger, richardm(a)emifix.com He is very clued-up and may be able to advise you, Good Luck! Source(s): http://www.emifix.com/in-house-training.…
http://www.fms-corp.com/interferenceconc…
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