What is the best way to desensitize my dog to the beep of my wheelchair going on?

My dog is a real guard dog and she hates when someone comes to the door but my dad orders a lot of stock for his shop to the house and the beep of the machines they use to keep track drives her crazy. The thing is my wheelchair makes a very similar noise when I turn it on so that makes her think someone is at the... show more My dog is a real guard dog and she hates when someone comes to the door but my dad orders a lot of stock for his shop to the house and the beep of the machines they use to keep track drives her crazy. The thing is my wheelchair makes a very similar noise when I turn it on so that makes her think someone is at the door.

What would be the best technique to desensitize her to that noise?
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