B&K Precision 879B - Manual - Manual (Page 34)

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that any measurements taken will not take into
account the test leads.
Setup Relative Mode
To setup the relative mode, simply press the
button once. The value that is on the display will
immediately be stored as the “reference” value. This
reference value will be used for all measurements so
as long as the meter is in relative mode, which is
indicated by the “ REL” indicator on the display.
A common use of relative mode is to “zero” out the
meter. With nothing connected to the input sockets
and terminals, simply press the
button once and
the meter will “zero” out, meaning all display reading
will become 0.
To make measurements within a specific test setup or
with test leads, it is recommended that the user first
have test leads or wires connected to the meter in the
fashion that they desire. Then, press the
button
once to “zero” out the meter as reference. This way,
any measurements taken would not be affected by the
test leads or setup.