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EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
EL 9000 B 15U/24U Series
3.10.14.5 Load curve data from USB stick for mode MPP4
Alternatively to manual adjustment of the 1-100 available curve points, which can be quite time-consuming, the
curve point data (only one voltage value per point) can be loaded from USB stick in form of a CSV file. See section
for the naming convention. Contrary to manual adjustment where you can define and use an arbitrary num-
ber of points, loading from USB requires the CSV file to always contain the full number of points (100), because
it can’t define which one is start and end. However, the on-screen setting for
Start
and
End
point remain valid. It
means, if you actually want to use all 100 points from your loaded curve, you must set the parameters according.
File format definition:
•
The file must be a text file with appendix *.csv
•
The file must contain only one column of voltage values (0... rated voltage)
•
The file must exactly 100 values in 100 rows, no gaps
•
The decimal separator of broken values must follow the setting
USB file separator format
where selection
US
means dot as decimal separator and selection
Standard
means comma
► How to load a curve data file for MPP4
1.
While the DC terminal is switched off, enter the
MENU
and the
Function Generator
and access
MPP
Tracking.
2.
In the screen switch to tab MPP4. In the lower part a button labeled
Import/Export
will appear. Tap it.
3.
In the next screen tap on
LOAD MPP4 voltage values from USB
, have your USB stick ready and follow
the instructions.
3.10.14.6 Save result data from MPP4 mode to USB stick
After the MPP4 function has run through, the result data can be saved to USB stick. The device will always save 100
data sets consisting of the actual values of voltage, current and power belonging to the points it has run through.
There is no extra numbering. In case the settings
Start
and
End
were not 1 and 100, the true result data can later
be filtered from the file. Points which where not adjusted are automatically set to 0 V, thus it’s very important to
carefully adjust start and end point because with a voltage setting of 0 V an electronic load would draw its rated
current. That’s because in this mode, current and power are always set to max.
Format of the result data file (for naming convention see section
Legend:
•
Column A: actual voltage of points 1-100 (= U
MPP
)
•
Column B: actual current of points 1-100 (= I
MPP
)
•
Column C: actual power of points 1-100 (= P
MPP
)
•
Rows 1-100: result data sets of all possible curve points
The values in the example table to the left are
with physical units. If that’s not wanted, they
can be turned off in the “General settings” of
the device with parameter “USB logging with
units (V,A,W)”.
► How to save a curve data file for MPP4
1.
After the function has run through, it will stop automatically. Tap on the
RETURN
button to go back to the
MPP4 configuration screen.
2.
Tap on the button labeled
Import/Export
.
3.
In the next screen tap on
SAVE MPP4 results to USB
, have your USB stick ready and follow the instructions.
You will have the choice to either overwrite any of the displayed files or to create a new one by tapping on
.
