B&K Precision 879B - Manual - Manual (Page 56)

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Figure 9 - Fuse Display
In the event that the above screen is displayed, a fuse
replacement is required. Turn off the meter by
pressing and holding down the button for 2
seconds. If this does not power off the meter, remove
external AC adapter if that is used and/or remove the
battery from the battery compartment. Refrain from
further operation until fuse is replaced. Please
contact B&K Precision for assistance.