B&K Precision 310 - Manual - Manual (Page 15)

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INPUT LIMITS & PROTECTIONS
The maximum continuous voltage which can be applied across the
potential and current leads is around 10.7V. Applying more than that
voltage will automatically blow their respective fuses.
However, the crowbar trigger can be factory adjusted for your
application.
We have specially selected that method to stop damaging the
instrument, should it be misused.