B&K Precision 830C - Manual - Manual (Page 27)

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one that has the correct AC line voltage input for use
in your country.
For external power, use AC adapter rated for
output 12VDC, 150mA, with a standard 4mm
connector only.
WARNING: Use of incorrect adapters may damage
the instrument. Please use B&K Precision’s adapter
only. Be sure to use one with the correct AC line input
voltage.
To connect the adapter, do the following:
1. If a battery is installed, please check the
battery compartment again that the polarity of
the battery matches the polarity as indicated
by the labels inside the compartment. If it is
not, please remove and insert the battery with
matching polarity. If a battery is not installed,
continue to the next step.
WARNING: DO NOT, at any time, connect
an external power adapter when a battery
is installed incorrectly (reverse polarity or
non-matching polarity to indicator of
battery compartment). Doing so will
damage the instrument and void its
warranty.