12 Operation of the Software PVPM.disp
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12.3.2
Manage Files on the PVPM
At first the time settings of PC and PVPM will be compared – if
the time differs more than 5 minutes the application will ask
whether to correct the PVPM time with the PCs time setting. Now
the measurement data stored on PVPM will be displayed in a list
(the PVPM must be connected and online for this function). Now
you can select data sets from the list (even more than one) and
either transfer it to the PC for further processing (Button “Get data”) or just delete it from the PVPM (Button
“Delete data”). You can set the destination directory with a directory dialogue that appears if you click on the
directory symbol right of the displayed directory.
Caution: Carrying out the “delete” function can not be withdrawn!!
When you select data transfer the data sets will be transferred one after the other and the files are stored to disk
automatically using a file name that contains the date and time of the measurement.
If the checkbox “Delete data after transfer” is checked a dialog will appear after the transfer and ask, whether
the transferred data should be deleted now from the PVPMs memory. Only if you are really shure that the data
on the PVPM will not be used any more you can answer “Yes” here – the marked datasets will be deleted from
the PVPMs memory.
12.3.3
Synchronize PVPM to PC date/time
With this function the internal real time clock of the PVPM is set
to the PCs date/time.
12.3.4
Modify PVPM sensor database
You can connect different irradiance sensors to the PVPM. Every sensor has its own calibration value, the
PVPM needs to know this value for correct operation. To make the selection of a sensor simple during
measurement you can define a table with up to ten different sensors, its names and calibration values, which
will be stored in the PVPMs permanent memory. So later on
you just have to select the appropriate sensor at the PVPM.
The name you give the sensor is more or less free
selectable, but it should be short and informative. It will be
displayed later on on PVPMs display and informs you about
the actually selected sensor. You can select the sensor at
the PVPM via the menu “Service” and “Select sensor”.
If you want to modify the sensors database the PVPM must
be connected and ready for data transfer. When you start
this function the database is loaded from PVPM and will be
stored back to PVPM when you close this form.
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.
12.3.5
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.
Operation manual for PVPM devices
PV-Engineering GmbH
