How Do You Use Current Balance and Hall Probes in Magnetic Field Measurement?

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mysqlpress
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Yes, I am a newbie in this forum. I came from Hong Kong... and well, the question is the same as above , What are the precautions of using current balance to measure the constant magnetic flux density? as much as you can.

Moreover, How can a hall probe be used to measure alternating b-field?
 
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