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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 isn’t 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 cycles)
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.
Diagrams:
Applications and results:
Sta
rt (D
C)
t
U,I
Seq.time
En
d (
DC
)
Example 1
Focusing 1 cycle of 1 sequence point:
DC values for start and end are the same, also the AC amplitude.
With a frequency >0 a sine wave progression of the set value is
generated with a defined amplitude, frequency and offset (DC value
at start and end).
The number of sine waves per cycle depend on the sequence point
time and the frequency. If the time were 1 s and the frequency 1 Hz,
there would be exactly 1 sine wave. If the time were 0.5 s at the same
frequency, there would only be a half sine wave.
Sta
rt (D
C)
t
U,I
Seq.time
En
d (
DC
)
Example 2
Focusing 1 cycle of 1 sequence point:
The DC values at start and end are the same but the AC (amplitude)
not. The end value is higher than the start so that the amplitude
increases with each new half sine wave continuously through the
sequence. This, of course, only if the sequence time and frequency
allow for multiple waves to be created. e.g. for f=1 Hz and Seq. time
= 3 s, three complete waves would be generated (for angle = 0°) and
reciprocally the same for f=3 s and Seq. time=1 s.
Sta
rt (D
C)
t
U,I
Start (AC)
End (AC)
Seq.time
En
d (
DC
)
Sta
rt (D
C)
t
U,I
Start (AC)
End (AC)
Seq.time
En
d (
DC
)
Example 3
Focusing 1 cycle of 1 sequence point:
The DC values at start and end are unequal, as are also the AC val-
ues. In both cases the end value is higher than the start so that the
offset increases from start to end (DC) and the amplitude also with
each new half sine wave.
Additionally the first sine wave starts with a negative half wave be
-
cause the angle is set at 180°. The start angle can be shifted at will
in 1° steps between 0° and 359°.
