Page 77
EA Elektro-Automatik GmbH
Helmholtzstr. 31-37 • 41747 Viersen
Germany
Fon: +49 2162 / 3785-0
Fax: +49 2162 / 16230
www.elektroautomatik.de
PSB 9000 3U Series
Schematic diagram:
Application and result:
t
A
U
st
art
1
2
3
4
5
t1
Sequence points
The built-in load function acts as a sink and ensures the
quick output voltage drop as required for some part of
the curve, such enabling 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 start voltage (U start) is adjustable as parameter
“U=” in the menu page “U/I/P Limits”. It does no modify
the voltage settings in the single sequence points.
3.11.10 Arbitrary function
The arbitrary (freely definable) function offers the user further scope. There are 99 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 process can be built up. 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 endlessly. The function only acts
on either current or voltage, thus a mix of assignment to current (I) or voltage (U) is not possible. Furthermore, it
only acts in either source or sink mode.
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 point is allocated a sequence point time in which the
AC/DC curve from start to finish will be generated.
The following parameters can be configured for each sequence point in the arbitrary function:
Value
Range
Description
Is(AC)
-50%...+50% I
Nom
Start amplitude of the sine wave part (I mode)
Ie(AC)
-50%...+50% I
Nom
End amplitude of the sine wave part (I mode)
Us(AC)
0...50% U
Nom
Start amplitude of the sine wave part (U mode)
Ue(AC)
0...50% U
Nom
End amplitude of the sine wave part (U mode)
fs(1/T)
0 Hz...10000 Hz
Start frequency of the sine wave part
fe(1/T)
0 Hz...10000 Hz
End frequency of the sine wave part
Angle
0°...359°
Start angle of the sine wave part
Is(DC)
Is(AC)...(I
Nom
- Is(AC))
Start value (=offset) of the DC part of the curve (I mode)
Ie(DC)
Ie(AC)...(I
Nom
- Ie(AC))
End value (=offset) of the DC part of the curve (I mode)
Us(DC)
±(Us(AC)...(U
Nom
- Us(AC)))
Start value (=offset) of the DC part of the curve (U mode)
Ue(DC)
±(Ue(AC)...(U
Nom
- Ue(AC)))
End value (=offset) of the DC part of the curve (U mode)
Seq.time 0.1 ms...36000 s
Time setting of the selected sequence point
The sequence point time (seq. 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 fs = 1 Hz, fe = 11 Hz and Seq.time = 5 s
would not be accepted as
Δ
f/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.
