3 Software Overview
3-16
Using the Tab Screens
The tabs along the left edge of the screen display measurement data in various ways. The
paragraphs below explain how the features of each tab are used.
Certain elements are common to more than one tab. These include the Status indicator,
the Measure Now button, the Assign and Save... button, the Reassign... button, the
wireless sensor displays, and the Environmental Inputs slide-up panel.
Traces Tab
Displays the most recent measurement results along with the predicted shape of the I-V
curve (if a PV model is selected). Figure 46 is an example of the Traces tab screen.
Figure 46. Traces tab, showing the measured I-V curve and the expected locations of
Isc, maximum power point, and Voc.
The graph area can display four types of information, selectable by the user from the
View menu:
• I-V curve. This solid red curve displays the measured I-V points transmitted
from the I-V Measurement Unit. Points below 0 V are not displayed.
• I-V curve prediction markers. The three red dots are the predicted I-V points for
the short circuit current I
sc
(I
sc
, 0), the maximum power point (I
mp
, V
mp
), and the
open circuit voltage V
oc
(0, V
oc
).
• P-V curve. This solid blue curve displays the power available from the test
device (module or string), calculated from the I-V curve by multiplying I x V for
each I-V point. The blue point marks the maximum value on the P-V curve. This
value is calculated by fitting a mathematical curve to the top of the P-V curve
and then calculating the maximum value of the fitted curve. This reduces the
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