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Unbalance
Phasor13
13-3
to define start and duration of the measurement.
Cursor. When the Cursor is on, the Trend values at the Cursor are displayed in the screen
header. Moving the Cursor off the left or right side of the screen brings the next of six
screens into the viewing area.
Zoom. Allows you to expand or shrink the display vertically or horizontally to view
details or to fit a complete graph within the screen area. Zoom and Cursor are operated by
the arrow keys and explained in Chapter 19.
Offset and Span are preset for a good display in most cases, but they are adjustable. Also
the PHASOR PREFerence is adjustable. This concerns the rotation indication to show
phase direction or phase sequence and the phase angle representation (+/–). The
adjustment menu is reached via the SETUP key and function key F3 - FUNCTION
PREF. See Chapter 20, FUNCTION PREFerences.
Phasor
To access the Unbalance Phasor screen:
g
F3
Shows the phase relation between voltages and currents in a vector diagram divided in 30
degree sections. The vector of the reference channel A (L1) points to the positive
horizontal direction. A similar vector diagram is displayed under Scope Phasor.
Additional numerical values are given: negative voltage or current unbalance (Relative %
or Absolute), zero sequence voltage or current unbalance (Relative % or Absolute),
fundamental phase voltage or current, frequency, phase angles. With function key F1
you can choose readings of all phase voltages, all phase currents, or voltage and current
in one phase.