B&K Precision 879B - Manual - Manual (Page 33)

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For details on selecting the optimal test frequency for
measurement, refer to the “SUPPLEMENTAL
INFORMATION” section.
Selecting Frequency
To select or change the test frequency, push the
button once. With each press, the test
frequency will be indicated on the secondary display
of the meter. This will remain displayed until a
different function for the secondary display is selected.
The selectable test frequencies for 879B meter are:
100 Hz, 120 Hz, 1 kHz, and 10 kHz.
The selectable test frequencies for 878B meter are:
120 Hz and 1 kHz.
Relative Mode
Relative mode is used when the user wants to “zero”
the meter based on a reference value or wants to
obtain a reading that is relative to a reference value.
For example, if test leads are used in the
measurement, the user may want to set a reference
with the test leads inserted into the input terminals so