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Page 90
ERS COMPACT
3.11.10.1 Loading and saving the arbitrary function
The 99 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 99 points are saved or loaded at once using a text file of type CSV
which represents a table of values.
In order to load a sequence table for the arbitrary generator, following requirements have to be met:
•
The table must contain exactly 99 rows with 8 subsequent values (8 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 stick
• 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
Connected to HMI parameter
Range
A AC start See table in “3.11.10. Arbitrary function”
B AC end See table in “3.11.10. Arbitrary function”
C Start frequency
0...10000 Hz
D End frequency
0...10000 Hz
E Angle
0...359°
F DC start See table in “3.11.10. Arbitrary function”
G DC end See table in “3.11.10. Arbitrary function”
H
Time
100...36.000.000.000 μs (36 billion)
For details about the parameter and the arbitrary function refer to “3.11.10. 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 ERSC 10080-1000
4U, 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 at all.
►
How to load a sequence point table from a USB stick:
1.
Do not plug the USB stick yet or remove it.
2.
While the DC terminal is switched off, tap on
to access the function selection
menu. There tap on group “Arbitrary” which will
show the settings as shown in the screenshot
to the right.
3.
Swipe up to go down to the “Sequence setup”
part and tap on
Import/Export
, then on
Load
and follow the instructions.
If the file open dialog can at least list one compatible file, it will be listed for selection. Select your desired
table.
4.
To finally load the file, tap on . The selected file is then checked for validity and loaded. In case
of format errors, a message will be shown on screen. The file would have to be checked and tried again.