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Air core coil design and test.

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cxf208

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Hi:
I have designed an air core coil sensors with a diameter of 50cm, 60 turns. The inductance is about 3.6mH. I use a frame of ABS material.
Here are the questions. When I connect the coil to an oscilloscope, there are noises of 50Hz. But when I switched the connectors, the noise of 50Hz is suppressed obviously. I changed nothing except for switching the connectors(from ++, -- to +-, -+.). It seems that the coil sensor has a different filter for the magnetic fluxes crossing it.
I don’t use any shield, just test it in my office.
Can anyone tell me the possible reasons of this phenomenon?
Thank you!
 

Hi:
I have designed an air core coil sensors with a diameter of 50cm, 60 turns. The inductance is about 3.6mH. I use a frame of ABS material.
Here are the questions. When I connect the coil to an oscilloscope, there are noises of 50Hz. But when I switched the connectors, the noise of 50Hz is suppressed obviously. I changed nothing except for switching the connectors(from ++, -- to +-, -+.). It seems that the coil sensor has a different filter for the magnetic fluxes crossing it.
I don’t use any shield, just test it in my office.
Can anyone tell me the possible reasons of this phenomenon?
Thank you!
are you in a country where the line voltage in is AC at 50 Hz?
 

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