Fluke 289 - Manual (Page 37)

True-rms Digital Multimeters
Making Measurements
27
only when both the ac and dc signals drop below 10% of the
present range. For AC+DC, ranging is controlled by the
underlying values of the ac and dc signals and not by the sum of
the AC+DC calculation.
To exit the AC+DC mode, press the softkey labeled Menu and
select the default mode for the selected function. For dc volts
and dc millivolts functions, move the menu selector to VDC and
press the softkey labeled VDC. For the current functions, move
the menu selector to the AC,DC menu item and press either the
AC or DC softkey.