User Manual

Page 62
PSI 9000 3U Series
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3.8.10 Arbitrary function
Thearbitrary(freelydenable)functionofferstheuserfurtherscope.Upto100sequencesareavailableforuse
forcurrentIandvoltageU,allofwhichhavethesameparametersbutwhichcanbedifferentlyconguredsothat
a complex function process can be built up. The 100 sequences can run one after another in a sequence block,
and this sequence block can then be repeated many times or endlessly. From the 100 sequences a block can be
freelydenedtorunfromsequencextosequencey.AmixofassignmenttocurrentIorvoltageUisnotpossible;
a sequence or sequence block acts only on current or voltage.
The arbitrary curve overlays a linear progression (DC) with a sine curve (AC), whose amplitude and frequency
are shaped between start and end values. If the start frequency (fs) = end frequency (fe) = 0 Hz, the AC values
have no impact and only the DC part is effective. Each sequence is allocated a sequence time in which the AC/
DCcurvefromstarttonishwillbegenerated.
Thefollowingparameterscanbeconguredforeachsequenceinthearbitraryfunction(thetablelistsparameters
for current, for voltage it would be Us, Ue etc.)
Value Range Seq. Description
Is(AC) 0...50% Nominal value I 1-100 Start amplitude of the sine wave part of the curve
Ie(AC) 0...50% Nominal value I 1-100 End amplitude of the sine wave part of the curve
fs(1/T) 0 Hz...1000 Hz 1-100 Start frequency of the sine wave part of the curve (AC)
fe(1/T) 0 Hz...1000 Hz 1-100 End frequency of the sine wave part of the curve (AC)
Angle 0°...359° 1-100 Start angle of the sine wave part of the curve (AC)
Is(DC) Is(AC)...(Nominal value - Is(AC)) of I 1-100 Start value of the DC part of the curve
Ie(DC) Ie(AC)...(Nominal value - Ie(AC)) of I 1-100 End value of the DC part of the curve
Seq.time 0.1 ms...36000 s 1-100 Time for the selected sequence
The sequence time (seq. time) and the start and end frequency are related. The minimum value
for Δf/s is 9.3. Thus, for example, a setting of fs = 1 Hz, fe = 11 Hz and Seq.time = 5 s would
not be accepted as Δf/s is only 2. A seq. time of 1 s would be accepted, or, if the time remains
at 5 s, then fe = 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areacceptedwithSAVE,furthersequencescanbecongured.If
the button NEXT is touched a second settings screen appears in which global settings for all 100 sequences are
displayed.
The following parameters can be set for the total run of an arbitrary function:
Value Range Description
Start seq. 1...End seq. First sequence in the sequence block
End seq. 100...Start seq. Last sequence in the sequence block
Seq. Cycles ∞orr1...999 Number of cycles of the sequence block.
Schematic diagram: Applications and results:
Start (DC)
t
A
Start (AC)
Seq.time
End (DC)
Example 1
Focussing 1 cycle of 1 sequence from 100:
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dened amplitude,frequencyandY-shift(offset,
DC value at start and end)
The number of sine waves per cycle depend on the sequence time
and the frequency. If the sequence 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.