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Old 22nd August 2012, 03:55 AM   #11
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When the relay isn't moving, the field from the magnet is constant and has zero effect. If you want to do a test, put the biggest neodymium magnet on your turntable leads and see if you hear a difference. Wait, have somebody else put it there (or pretend to) otherwise you probably will hear a difference. There's no "dB down" number involved since there are no ac signals to compare. It's a non-issue.
I may be barking up the wrong tree, but at least I'm barking!
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Old 22nd August 2012, 04:01 AM   #12
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The contacts and the rest of the signal paths through the relay are inductors, just low inductance ones as they're not coils; therefore, the ferromagnetic material in their vicinity must act to an extent like the core of an inductor. That doesn't move in a normal cored inductor either, yet obviously the core has an effect! No doubt the scale of the effect is very small in a relay, but I haven't yet read an order-of-magnitude estimate of how small it is.
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Old 22nd August 2012, 07:29 AM   #13
disco is offline disco  Netherlands
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Any thoughts on mercury wetted relays? Ron < 14 micro ohm.
I'm looking for double pole (or 4 pole to switch grounds at once) bi-stable units but can't locate a source.
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Old 2nd September 2012, 08:51 AM   #14
jitter is offline jitter  Netherlands
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Originally Posted by muckrake View Post
Sealing in vacuum makes no sense due to the pressure difference. It's much easier to use a non-reactive gas such as argon or helium at slightly below atmospheric pressure (i.e. at max altitude the relays are likely to be used at). This decreases structural requirements of the relay body and seal. Since we're talking about low-level signals, arcing is not an issue.
Here is an interesting pdf in part relevant to this thread.
The document focuses mainly on nitrogen and sulfur hexafluoride as fill gases, so these are probably more commonly used than argon or helium.
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