B&K Precision 879B - Manual - Manual (Page 32)

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D/Q/θ/ESR Select Mode
The secondary display of the LCR meter is used to
indicate measured values for four various parameters
(two for model 878B, which excludes θ and ESR
measurement mode), which provide additional
information of the component being tested and is
supplementary to the primary mode measurements.
These modes are: D (Dissipation factor), Q (Quality
factor), θ (Phase angle), and ESR (Equivalent series
resistance).
To change between these measurement parameters,
press the (or for model 878B) button.
The parameters for measurement will change and
repeat upon each button press. On the screen, the
indicators “ D”, “Q”, “θ” (model 879B only), or “ESR”
(model 879B only) will be displayed to indicate which
secondary mode the meter is in.
Test Frequency
The 879B and 878B LCR meters use an AC signal to test
and measure components at the input sockets or terminals.
With this measurement method, a test frequency must be
selected. The test frequency can affect the accuracy of the
results depending on what frequency is selected and what
type and value of a component is being measured or tested.