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PSI 10000 4U Serie
3.10.9
DIN 40839 function
This function is based on the curve defined in DIN 40839 / EN ISO 7637 (test impulse 4), and is only applicable
to voltage. It shall replicate the progress of automobile battery voltage during engine starting. The curve is divided
into 5 sequence points (see diagram below) which each have the same parameters. The standard values from the
DIN are set already as default values for the five point.
The following parameters can be configured for the DIN40839 function:
Parameter
Range
Seq Description
Start
0...Nominal value of U
1-5
Start voltage of the ramp in part 1-5 (sequence point)
Uend
0...Nominal value of U
1-5
End voltage of the ramp in part 1-5 (sequence point)
Time
0.1 ms...36,000,000 ms
1-5
Time of the ramp
Cycles
0...999
-
Number of repetitions of the entire curve (0 = ∞)
Time t1
0.1 ms...36,000,000 ms -
Time after cycle before repetition (cycle <> 1)
U(Start/End)
0...U
Nom
-
Voltage setting before and after the function run
I/P
0...I
Nom
/P
Nom
-
Global set values of current and power
Schematic diagram:
Application and result:
t
U
U
st
ar
t
1
2
3
4
5
t1
Sequence points
The function isn’t suitable for standalone operation of a
power supply, but optimal for a power supply operation in
conjunction with an electronic load, for example one from
ELR 10000 series. The load acts as a sink for the rapid fall
of the output voltage of the power supply 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 in sequence point 4 should be a sine wave, then
these 5 points would have to be transfered to the arbitrary
generator.
3.10.10
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
0...50% Nominal value of U or I
Start/end amplitude of the sinusoidal AC part
DC start
AC start...((Nominal of U or I) - (AC start))
Start amplitude of the DC part
DC end
AC end...((Nominal of U or I) - (AC end))
End amplitude of the DC part
Start frequency
End frequency
0 Hz...10000 Hz
Start/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 for the selected sequence
