MI 2892 Power Master
Operating the instrument
56
Table 3.37: Keys in Unbalance diagram screens
HOLD
Holds measurement on display. Hold clock time will be displayed in the
right top corner.
RUN
Runs held measurement.
U
I
I
U
Shows voltage unbalance measurement and selects voltage for scaling
(with cursors)
Shows current unbalance measurement and selects current for scaling
(with cursors)
METER
Switches to PHASE DIAGRAM view.
UNBAL.
Switches to UNBALANCE DIAGRAM view.
TREND
Switches to TREND view (available only during recording).
Scales voltage or current phasors.
Triggers Waveform snapshot.
Returns to the “MEASUREMENTS” submenu.
3.10.3
Unbalance trend
During active recording UNBALANCE TREND view is available (see section 3.14 for instructions how to
start GENERAL RECORDER).
Figure 3.38: Symmetry trend screen
Table 3.38: Instrument screen symbols and abbreviations
u-
Maximal ( ), average ( ) and minimal ( ) value of negative sequence voltage
ratio u-
u0
Maximal ( ), average ( ) and minimal ( ) value of zero sequence voltage ratio u
0
i-
Maximal ( ), average ( ) and minimal ( ) value of negative sequence current
ratio i-
i0
Maximal ( ), average ( ) and minimal ( ) value of zero sequence current ratio i
0
U+
Maximal ( ), average ( ) and minimal ( ) value of positive sequence voltage U
+
U-
Maximal ( ), average ( ) and minimal ( ) value of negative sequence voltage U
-
U0
Maximal ( ), average ( ) and minimal ( ) value of zero sequence voltage U
0
I+
Maximal ( ), average ( ) and minimal ( ) value of positive sequence current I
+
F1
F2
F4
