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EPS Stromversorgung GmbH
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Germany
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www.eps-germany.de
PSI 9000 2U Series
3.10.10.1 Loading and saving the arbitrary function
The 100 sequence points of the arbitrary function, which can be manually configured with the control panel of the
device and which are applicable either to voltage (U) or current (I), can be saved to or loaded from a common
USB stick via the front side USB port. Generally, all 100 points are saved or loaded using a text file of type CSV
(semicolon separator), which represents a table of values.
In order to load a sequence point table for the arbitrary generator, following requirements have to be met:
•
The table must contain exactly 100 rows with 8 subsequent columns and must not have gaps
•
The column separator (semicolon, comma) must be as selected by MENU parameter “USB file separator format”;
it also defines the decimal separator (dot, comma)
•
The files must be stored inside a folder called HMI_FILES which has to be in the root of the USB drive
•
The file name must always start with WAVE_U or WAVE_I (not case-sensitive)
•
All values in every row and column have to be within the specified range (see below)
•
The columns in the table have to be in a defined order which must not be changed
Following value ranges are given for use in the table, related to the manual configuration of the arbitrary generator
(column headers like in Excel):
Column Parameter
Range
A
AC start amplitude
0...50% U or I
B
AC end amplitude
0...50% U or I
C
Start frequency
0...1000 Hz
D
End frequency
0...1000 Hz
E
AC start angle
0...359°
F
DC start offset
0...(Nominal value of U or I) - AC start amplitude
G
DC end offset
0...(Nominal value of U or I) - AC end amplitude
H
Sequence point time in μs
100...36.000.000.000 (36 billion μs)
For details about the parameter and the arbitrary function refer to
„3.10.10. Arbitrary function“.
Example CSV:
The example shows that only the first two sequence points are configured, while all others are set to default val
-
ues. The table could be loaded as WAVE_U or WAVE_I when using, for example, the model PSI 9080-120 2U,
because the values would fit both, voltage and current. The file naming, however, is unique. A filter prevents you
from loading a WAVE_I file after you have selected “Arbitrary --> U” in the function generator menu. The file would
not be listed as selectable at all.
►
How to load a sequence point table from an USB stick:
1.
Do not plug the USB drive yet or remove it.
2.
Access the function selection menu of the function generator with
MENU -> Function Generator -> Arbitrary -> U/I, to see the main screen
of sequence point selector, as depicted to the right.
3.
Tap touch area
, then
and follow the instructions
on screen. If at least one valid files has been recognized (for file and
path naming see above), the device will show a list of files to select
from with .
4.
Tap touch area
in the bottom right corner. The selected file is then checked and loaded, if valid.
In case it is not valid, the device will show an error message. Then the file must be corrected and the
steps repeated.
