Solmetric PVA-1000S, Руководство пользователя

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3 Software Overview
3-22
Name Description
efficiency of conversion from sunlight to electric power). It is
defined as (I
mp
x V
mp
) / (I
sc
x V
oc
) and is discussed in detail in
Chapter 7,
Interpreting Measured I-V Curves..
Current Ratio The current ratio is a relative indication of the slope of the
horizontal leg of the I-V curve. It is defined as I
mp
/Isc. For
more detail see
Chapter 7,
Interpreting Measured I-V Curves.
Voltage Ratio The voltage ratio is a relative indication of the slope of the
vertical leg of the I-V curve. It is defined as V
mp
/V
oc
. For more
detail see
Chapter 7,
Interpreting Measured I-V Curves.
Irradiance, temperature
and tilt The irradiance, temperature, and tilt associated with the
current measurement are displayed in the Summary Bar,
directly below the table.
History Tab
Automatically displays the tabular results of your most recent measurements. New results
appear in the left-hand column. Previous results are shifted to the right. The table holds
up to 32 results. Once that limit is reached, the oldest measurement result is dropped from
the table each time a new measurement is taken. The parameters displayed in the History
tab are identical to the results shown in the Table tab.
The History tab is especially useful for inspecting the agreement between measurements
taken at a combiner box during commissioning tests, and also for displaying sequential
steps in a troubleshooting sequence. For example, when using the Selective Shading
Method to find the failing module in a string of N (quantity) modules, you can use the
History Tab to display and compare the N measurement results. The column with the odd
result corresponds with shading the bad module.
The current contents of the History table are saved in your Project file, so the most recent
contents will still be there when you close and re-open the PVA software. However, the
contents are not saved to the System Tree like your I-V curves, and when you recall an I-
V curve from the System Tree, the History table is not updated to match that recalled
measurement. Also, the History table contents are not exported when you export your I-V
curve data.