SATEC RDM172 Manual - Manual (Page 110)

Chapter 4 PAS Application Software Viewing Recorded Files
110 Series PM172 Powermeters
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, PAS 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
PAS 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...”,