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Page 87
ERS COMPACT
Schematic diagram:
Application and result:
t
U
U
st
ar
t
1
2
3
4
5
t1
Sequence points
If the function is set up to run in source mode, the built-
in load function acts as a sink and ensures the quick
output voltage drop as required for some parts of the
curve, allowing the output voltage progress to follow
the DIN curve.
The curve conforms to test impulse 4 of the DIN. With
suitable settings, other test impulses can be simulated.
If the curve part in sequence point 4 should contain a
sine wave instead, then these 5 sequences would have
to be set up for the arbitrary generator.
The global start (and end) voltage is adjustable as
parameter “U(Start/end)” in the menu page “U/I/P Lim
-
its”. It does no modify the voltage settings in the single
sequence points, but it should match the start voltage
setting (U start) of sequence point 1.
3.11.10
Arbitrary function
The arbitrary (freely definable) function or function generator offers the user a wider scope of options. There are 99
curve segments (here: sequence points) available for use on either current (I) or voltage (U), all of which have the
same set of parameters but can be differently configured, so that a complex function curve can be “constructed”.
An arbitrary number out of the 99 sequence points can run in a sequence point block and this block can then be
repeated up to 999 times or infinitely. Since the function must be assigned to either current or voltage, mix assign
-
ments of sequence point to both is not possible.
The arbitrary curve can overlay a linear progression (DC) with a sine curve (AC) whose amplitude and frequency
is shaped between start and end. When both, start frequency and end frequency, are 0 Hz the AC overlay has no
impact and only the DC part is effective. Each sequence point is allocated a sequence point time in which the AC/
DC curve from start to end will be generated.
The following parameters can be configured for each sequence point in the arbitrary function:
Parameter
Range
Description
AC start
AC end
-50%...+50% I
Nom
or
0%...50% U
Nom
Start and end amplitude of the sinusoidal AC part
DC start
±(AC start...(rated value - AC start)) Start level (offset) of the DC part
DC end
±(AC end...(rated value - AC end))
End level (offset) of the DC part
Start frequency
0 Hz...10000 Hz
Start frequency of the sinusoidal AC part
End frequency
0 Hz...10000 Hz
End frequency of the sinusoidal AC part
Angle
0°...359°
Start angle of the sinusoidal AC part
Time
0.1 ms...36,000,000 ms
Time setting for the selected sequence point
The sequence point time (“Time”) and the start and end frequency are related. The minimum
value for
Δ
f/s is 9.3. Thus, for example, a setting of start frequency = 1 Hz, end frequency = 11
Hz and time = 5 s would not be accepted as
Δ
f/s is only 2. A time of 1 s would be accepted or,
if the time remains at 5 s, then an end frequency = 51 Hz must be set.
The amplitude change between start and end is related to the sequence time. A minimal change
over an extended time is not possible and in such a case the device will report an inapplicable
setting.
After the settings for the selected sequence point have been defined, further points can be configured. Further
down below there are some global settings for the arbitrary function:
Parameter
Range
Description
Cycles
0 / 1...999
Number of cycles to run the sequence point block (0 = infinite)
Start sequence 1...End sequence
First sequence point in the block
End sequence
Start sequence...99
Last sequence point in the block
After continuing with
there are global set values to define as last part of the function generator setup.