10Operation of the Software PVPM.disp 27
To enter a new value just select a free line in the list and enter the values in the edit fields below the table.
After finishing all entries, press OK. Now you will be asked whether the data should be transferred to PVPM.
You should select “Yes” here or your changes will be discarded.
10.3.5 Calculate internal series resistor
Basing on the nominal values of short circuit current, open
circuit voltage, and the I and V value of the MPP the
PVPM can calculate the effective solar cell curve and with
this the expected internal series resistance R
s
. This
theoretical value can be compared to the actually
measured value and give a hint, whether there are
problems for example in the cabling.
10.3.6 Continuous measurement
This function allows the automatically timed measurement
controlled from the PC.
Set the desired time interval and the time unit (seconds,
minutes, hours) for the execution of the measurement and
the number of repetitions (0, if measurements shell be
repeated infinite).
After pushing the button “Start measurement” the
measurement runs automatically and can be cancelled by
the “Stop” button. The measured data will automatically
stored to files in the predefined directory. The file names
contain the date and time of the measurement.
The automatic measurement will stop, when the given
number of repetitions are finished or when the PVPM does
not answer.
10.3.7 Settings
All changes made here will be saved automatically and are
valid until the next change.
10.3.7.1 Serial Port
You can select the serial RS232 port (COMn:) used for PVPM
communications from the combo box
If the application can read the list of existing serial interfaces
from the Windows registry, the identifiers of the interfaces
defined there are represented in the combobox - together with
the reference whether this interface is available or not. In the
latter case this interface is already occupied by another
application. If the registry cannot be read (insufficient user
rights), the application will only display simple interface
identifiers like „COMx“. A selection of the interface is possible
anyway. If you do not know, to which interface the PVPM is
attached, you can use the button „look for“: that allows the
Operation manual for PVPM devices PV-Engineering GmbH
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