Hi guys,
I have a device which needs to take very sensitive measurements and I want to block all the electromagnetic interference from AC power lines and the transformer I have in the device (60Hz), the DC field from the power supply (~0 Hz), and the field from an oscillator (~700 Hz).
I am looking at doing two things, the first is to build a faraday cage to block the high frequency fields (60 and 700 Hz). This I will do by taking copper or aluminum sheets to build a box around the board that does the measurement. The second thing I want to do is surround this box with Mu-metal so that the static fields go around the box.
From what I understand, the static fields will bend around the Mu-metal and not pass through, while the changing fields will induce an opposite field inside the copper box to cancel out the field.
Any pointers from people who have done this before would be great. I think I should have the boards inside the faraday cage (copper) and then have the entire faraday cage inside the Mu-metal cage. Does that sound right or will the Mu-metal also act like a faraday cage?
Thanks for the help.
I have a device which needs to take very sensitive measurements and I want to block all the electromagnetic interference from AC power lines and the transformer I have in the device (60Hz), the DC field from the power supply (~0 Hz), and the field from an oscillator (~700 Hz).
I am looking at doing two things, the first is to build a faraday cage to block the high frequency fields (60 and 700 Hz). This I will do by taking copper or aluminum sheets to build a box around the board that does the measurement. The second thing I want to do is surround this box with Mu-metal so that the static fields go around the box.
From what I understand, the static fields will bend around the Mu-metal and not pass through, while the changing fields will induce an opposite field inside the copper box to cancel out the field.
Any pointers from people who have done this before would be great. I think I should have the boards inside the faraday cage (copper) and then have the entire faraday cage inside the Mu-metal cage. Does that sound right or will the Mu-metal also act like a faraday cage?
Thanks for the help.