E-Mon E-PS-A-RTU-N - Manual (Page 119)

Chapter 4 Power
S O F T W A R E V I E W I N G R E C O R D E D F I L E S
PowerSmart+ Advanced Power Quality Meter 119
Selecting Waveform Channels
To select the channels you want to view on the screen, click on the waveform window with
the right mouse button, select “Channels...”, check the channels you want displayed, and
then click OK.
Using the Marker Lines
Waveform and RMS panes have two blue dashed marker lines. The left marker indicates
the position from where data is taken to calculate the harmonics spectrum and phasor
diagrams, and as the starting position for calculating the RMS, average and peak values.
The right marker indicates the end position for calculating the RMS, average and peak
values. The minimum distance between the two markers is exactly one cycle.
To change the marker position, click on the button, or click on the waveform window
with the right mouse button and select Set Marker, and then click on the point where you
want to put the marker. You can drag both markers with the mouse, or use the right and left
arrow keys on your keyboard to change the marker position. Click on the waveform pane to
allow the keyboard to get your input before using the keyboard.
Delta Measurements
To measure the distance between two waveform points, click on the Delta button , then
click on one point, and then click on the second point. The first reference point is still frozen
until you close and reopen Delta, while the second point can be placed anywhere within the
waveform line. You can measure a delta in both directions. To disable the Delta, click on
the Delta button once again.
Selecting the Time Axis
The horizontal axis can be displayed either in absolute time with date and time stamps, or
in milliseconds relatively to the beginning of a waveform. To change the time units, click on
the waveform window with the right mouse button, select “Options...”, click on the “Axes”
tab, select the desired units, and then click OK.
Viewing Phasor Diagrams
The phasor diagrams show you the relative magnitudes and angles of the three-phase
voltage and current fundamental component. All angles are shown relative to the reference
voltage channel.
To change the reference channel, click on the waveform window with the right mouse
button, select “Options...”, click on the “Phasor” tab, check the channel you want to make a
reference channel, and then click “OK”.
If you leave the Triangle box checked, Power Software connects the ends of the voltage
and current vectors showing you three-phase voltage and current triangles. This is useful
when analyzing voltage and current unbalances.
Phasor diagrams are calculated over one waveform cycle pointed to by the left marker line.
As you move the marker, the phasor diagrams are updated reflecting the new marker
position.
Viewing Symmetrical Components
Power Software can calculate the symmetrical components for voltages and currents at the
point indicated by the left marker line. To enable or disable the symmetrical components,
click on the waveform window with the right mouse button, select “Options...”, check or
uncheck the “Symmetrical components” box on the “Channels” tab, and then click OK.
Selecting Primary and Secondary Units
Voltages and currents can be displayed in primary or secondary units. Click on the
waveform window with the right mouse button, select “Options...”, select the desired units
for voltages and currents on the Channels tab, and then click OK.
Using a Zoom
Use the green arrowheads on the local toolbar to zoom in or out of the waveform graph.
Every click on these buttons gives you a 100-percent horizontal or 50-percent vertical
zoom. Use the magnifying glass buttons to get a proportional zoom in both directions.