FAQ: What does it mean when I am getting a "Rail protection tripped" error on my AC source?

The "Rail protection tripped" error means that there is an internal failure on the instrument. The unit must be returned for service. Contact Keysight Technologies at: https://service.keysight.com/infoline/public/product-service-query.aspx?PRODUCT_NO

Applies to: 6811B, 6812B, 6813B

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