MI 2892 Power Master
Operating the instrument
54
3.10
Phase Diagram
Phase diagram graphically represent fundamental voltages, currents and phase angles of the network.
This view is strongly recommended for checking instrument connection before measurement. Note that
most measurement issues arise from wrongly connected instrument (see 4.1 for recommended
measuring practice). On phase diagram screens instrument shows:
Graphical presentation of voltage and current phase vectors of the measured system,
Unbalance of the measured system.
3.10.1
Phase diagram
By entering PHASE DIAGRAM option from MEASUREMENTS submenu, the following screen is shown (see
figure below).
Figure 3.36: Phase diagram screen
Table 3.34: Instrument screen symbols and abbreviations
U1, U2, U3
Fundamental voltages Ufund
1
, Ufund
2
, Ufund
3
with relative phase angle to Ufund
1
U12, U23, U31
Fundamental voltages Ufund
12
, Ufund
23
, Ufund
31
with relative phase angle to
Ufund
12
I1, I2, I3
Fundamental currents Ifund
1
, Ifund
2
, Ifund
3
with relative phase angle to Ufund
1
or
Ufund
12
Table 3.35: Keys in Phase diagram screen
HOLD
Holds measurement on display. Hold clock time will be displayed in the
right top corner.
RUN
Runs held measurement.
U
I
I
U
Selects voltage for scaling (with cursors).
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.
F1
F2
F4
