[jbay808]

Not that I know any better, but wouldn't it be easier to build a mu-metal shielded enclosure to exclude the Earth's magnetic field (and anything else, eg. from nearby wiring), and then generate your own calibration field with a Helmholtz coil?

[nextaccountic]

Can you actually shield a magnetic field like you do for electric fields with Faraday cages?

[jbay808]

Absolutely you can. And that's what mu-metal is designed for.

[kimburgess]

Not stable ones.

[jbay808]

I'm not sure what you mean by this. You certainly can shield a static magnetic field by using a magnetically soft material.

[kimburgess]

Yes, but that's not a faraday cage.

[jbay808]

Ah. I think we're parsing nextaccountic's ambiguous grammar differently.

My reading: "Can magnetic fields be shielded (by mu-metal), like a Faraday cage shields electric fields?"

vs your reading: "Can a Farafay cage shield magnetic fields like it can shield electric fields?"

[kimburgess]

Yep, I was being pedantic meanwhile you were likely providing useful info :).