B&K Precision 830C - Manual - Manual (Page 29)

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Low Battery Indication
The capacitance meter has a low battery indicator to
notify the user when to replace the battery. When the
display starts flashing the indicator, the battery
voltage is below normal working voltage. In this case,
accuracy of the meter will also decrease. It is
recommended that the battery be replaced as soon as
possible before continuing operation. See “Installing
Battery” for instructions.
Backlit Display
The capacitance meter has a backlit display that
allows you to see the LCD display in dark conditions.
To turn on the back light, press and hold the
button for 2 seconds. Back light will turn on and
brighten the LCD display.
To turn off the back light at any time, press and hold
the button for 2 seconds again. Back light will
turn off and return to normal display.