User manual

Page 70
PSI 9000 DT Series
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Bylinkingtogetheranumberofdifferentlyconguredsequences,complexprogressionscanbecreated.Smart
congurationofthearbitrarygeneratorcanbeusedtomatchtriangular,sine,rectangularortrapezoidalwavefunc-
tions and thus, e.g. a sequence of rectangular waves with differing amplitudes or duty cycles could be produced.
Assignment to U or I makes 100 sequences available for the use on either current or voltage,
but not on a mix of both. That means that a sequence 1 which produces a ramp up on current
cannot be followed by sequence 2 which applies a sine wave to the voltage.
Schematic diagram: Applications and results:
t
A
Example 7
Focussing 1 cycle of 2 sequences from 100:
Asequenceconguredasinexample3isrun.
As the settings demand that the end offset (DC)
is higher than the start, the second sequence
runwillreverttothesamestartlevelastherst,
regardless of the values achieved at the end of
therstrun.Thiscanproduceadiscontinuity
in the total progression (marked in red) which
may only be compensated with careful choice
of settings.
t
A
Sequence 1 Sequence 2
Example 8
Focussing 1 cycle of 2 sequences from 100:
Two sequences run consecutively. The rst
generates a sine wave with increasing ampli-
tude, the second with a decreasing amplitude.
Together they produce a progression as shown
left. In order to ensure that the maximum wave
in the middle occurs only once,therstse-
quence must end with a positive half wave and
the second start with a negative half wave as
shown in the diagram..
t
A
Sequence 1 Sequence 2 Seq. 3 Sequence 4
Example 9
Focussing 1 cycle of 4 sequences from 100:
Sequence 1: 1/4th sine wave (angle = 270°)
Sequence 2: 3 Sine waves (relationship fre-
quency to sequence time: 1:3)
Sequence 3: Horizontal ramp (f = 0)
Sequence 4: Falling ramp (f = 0)