User Manual

Page 66
PSI 9000 3U Series
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► How to save a sequence table (100 sequences) to a USB ash drive:
1. DonotplugtheUSBashdriveyetorremoveit.
2. Access the function selection menu of the function generator via MENU -> Function Generator -> Arbitrary
3. Tap on , then .ThedevicewillrequestyoutoplugtheUSBashdrivenow.
4. Afterpluggingit,thedevicewilltrytoaccesstheashdriveandndthefolderHMI_FILESandreadthe
content.IftherearealreadyWAVE_UorWAVE_Ilespresent,theywillbelistedandyoucaneitherselect
one for overwriting with , otherwise select foranewle.
5. Finally save the sequence table with .
3.8.11 Ramp Function
Thefollowingparameterscanbeconguredforarampfunction.
Value Range Description
Ustart / Istart 0...Nominal value of U, I Start value (U,I)
Uend / Iend 0...Nominal value of U, I End value (U, I)
t1 0,1 ms...36000 s Time before ramp-up or ramp-down of the signal.
t2 0.1 ms...36000 s Ramp-up or ramp-down time
Schematic diagram: Application and result:
A.start
t
A
t1 t2
A.End
This function generates a rising or falling ramp between start
and end values over the time t2. Time t1 creates a delay before
the ramp starts.
The function runs once and stops at the end value.
ImportanttoconsiderarethestaticvaluesofUandIwhichdene
the start levels at the beginning of the ramp. It is recommended
that these values are set equal to those in A.start, unless the load
at the DC output should not be provided with voltage before the
start of the ramp. In that case the static values should be set to
zero.
3.8.12 UI and IU table functions (XY table)
The UI and IU functions offer the user the possibility to set a DC output current dependant on the DC output volt-
age, or a DC output voltage dependant on the DC output current. The function is table driven with exactly 4096
values, which are distributed over the whole measured range of actual output voltage or output current in the range
of0...125%UnomorInom.ThetablecaneitherbeuploadedfromaUSBashdrivethroughthefrontsideUSB
port of the device or via remote control (ModBus protocol or SCPI). The functions are:
UI function: U = f(I)
IU function: I = f(U)
In the UI function, the equipment measuring circuit determines the level from 0 to maximum of the output current.
For each of the 4096 possible values for output current a voltage value is maintained by the user in the UI table
whichcanbeanyvaluebetween0andnominalvalue.ThevaluesuploadedfromaUSBashdrivewillalways
be interpreted as voltage values even if the user calculated them as current values and incorrectly loaded them
as a UI table. The UI function suits very good for the simulation of fuel cell characteristics.